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You are here: Home / Blog

Privacy and Security News and Tips 20160517

May 17, 2016 by ATTOG Technologies Leave a Comment

When it comes to privacy and accountability, people always demand the former for themselves and the latter for everyone else. — David Brin

Weekly Tip

Protecting your Personally Identifiable Information

This week we saw news about Google deprecating Flash in Chrome except for a chosen few websites. We also saw news of Microsoft inserting more ads onto our Start menus in Windows 10 as well as automatically scheduling our computers to upgrade to Windows 10 whether or not you want to upgrade. Finally, we have seen the headlines about Facebook censoring the news to fit their agenda.

You DO NOT have to accept this. It is your right to have a browser that does not run Flash at all (Firefox), and to not be indexed and branded. As for the Windows 10 upgrade, there are ways to still be able to run non-Windows 10 versions if you want to or need to. With all of the privacy and security issues we know about in Windows 10, I would not recommend upgrading until or unless those issues are fixed.

Now, as for the news, as Americans it is our inalienable right to free speech, and as such we should demand a fair and impartial delivery of the news no matter our political, social, or philosophical leanings. Seek out such news outlets, gather your news from the source if possible, use multiple avenues, do as you must to be informed and educated about the country and world around you so that you can make informed decisions. Demand the same of everyone you know and even those you don’t. The more informed we are as a populous, the better equipped we are to stand up for our rights and to demand the best for ourselves.

Interesting News

Academics Make Theoretical Breakthrough in Random Number Generation

How hackers smooth-talked their way past the security of a power company

Google to block Flash on Chrome, only 10 websites exempt

Filed Under: Privacy, Security

Privacy and Security News and Tips 20160426

April 26, 2016 by ATTOG Technologies Leave a Comment

If you fail to plan, you are planning to fail!. — Benjamin Franklin

Weekly Tip

Protecting your Personally Identifiable Information

With the passing of Prince last week and the recent revelation that he did not have a will, I thought I would talk about some documents we should all have for our piece of mind, security, and to help our loved ones when the time comes.

As we mature and have dependents that count on us, we need to consider how they depend on us and how we can plan for our future and theirs. To ensure you have the appropriate authority in place, health care directives, and that your intentions are clearly and legally defined, the following documents are the bare minimum you will need:

  • Will/Trust
  • Advanced Directive or Living Will
  • Power of Attorney for Healthcare
  • Power of Attorney for Finances
  • HIPAA Release Form
  • Beneficiary designations
  • Letter of intent
  • Guardianship designations

These items should be professionally sourced, signed, witnessed and notarized. As a security consideration, the original should be on file with your attorney, a copy in your safe, and a copy with your executor. It is also a good idea to have scans of these in a secure format that you can take with you in an emergency.  You must make sure that all of these are maintained and updated and that they are stored as securely as possible.

Interesting News

Dangerous Windows 10 flaw lets hackers secretly run any app on your PC

It was shockingly easy for ’60 Minutes’ to hack a congressman’s iPhone

The FBI is working hard to keep you unsafe

Filed Under: Privacy, Security

Privacy and Security News and Tips 20160412

April 12, 2016 by ATTOG Technologies Leave a Comment

Man is still the most extraordinary computer of all. — John F. Kennedy

Weekly Tip

Protecting your Personally Identifiable Information

Yesterday was Patch Tuesday, and this week we had a major announcement from Microsoft. They announced that Flash content in Edge browser would now me click to play instead of auto playing like they have been in the past. This is a major step forward for online safety as Adobe was forced to release an out of band update for Flash to address yet another critical vulnerability. Flash has outlived its safe and useful existence and should be used with extreme caution.

My tip for this week has to do with updates and patching. If you are a Windows user, make sure you configure updates to cover all Microsoft applications and to automatically install all critical updates. and to at least notify you of other updates. It is best practice to install all updates when they become available. Also make sure you are updating your browsers since you are using Firefox instead of Internet Explorer. If you do have Flash installed, make sure to keep it up to date as well.

Interesting News

House committee votes unanimously for Email Privacy Act

50% of people will plug any old USB drive into their computers

Filed Under: Privacy, Security

Privacy and Security News and Tips 20160405

April 5, 2016 by ATTOG Technologies Leave a Comment

One person’s “paranoia” is another person’s “engineering redundancy.” — Marcus J. Ranum

Weekly Tip

Protecting your Personally Identifiable Information

March 31st was World Backup Day, so this week I wanted to talk about backups.

With the amount of information we store on our computers and phones, and the cost of storage, how can we not consider having a good backup system in place. Think about what you store from precious family photos, financial information, software and art we create, documents we write, and so many other things. What would you do if your drive failed? Would you be able to recover those precious documents? What if your computer was stolen?

It is suggested to have more than one copy on more than one type of media. For recovery speed and ease, an external drive connected to your machine is a good start. Consider fire, flood, and theft, and you would be wise to consider an off-site solution (I use CrashPlan). To be truly safe and not to trust a third party, you might consider storing something in a safe deposit box or at a trusted location.

For my most important data, I have a copy on my computer, a copy on mirrored external drives, a copy with CrashPlan, and a copy with a trusted acquaintance in their safe. All copies are encrypted before being sent and I hold the key.

Interesting News

The 3-2-1 rule and other backup tips

Security tips from a super-hacker: Kevin Mitnick’s advice on protecting laptops, smartphones, and more

Filed Under: Privacy, Security

Privacy and Security News and Tips 20160330

March 30, 2016 by ATTOG Technologies Leave a Comment

“This is my password,” said the King as he drew his sword. “The light is dawning, the lie broken. Now guard thee, miscreant, for I am Tirian of Narnia.” — C.S. Lewis

Weekly Tip

This week I thought I would bring you some ideas about usernames, passwords, passphrase vaulting, and online accounts.

Protecting your Personally Identifiable Information

When you think about all of the accounts we have online and the number of information leaks, think about how often you reuse the same username or worse, password. Best practice is to use unique passwords for everything you do, and not to share them unless absolutely necessary, and then change it as soon as the other party no longer needs it. Remember, a secret is no longer a secret when a second person knows it. A password manager like 1Password or Lastpass helps to organize and maintain unique passwords, but consider using unique usernames too to make it that much harder for someone to even attempt to access a second account with the information from the first. The links this week are to my site and give a much longer explanation on passwords and vaulting with password managers.

A bonus idea is to consider using disposable email addresses for sites that may share your information. Gmail and Google Apps both allow you to create unlimited aliases on the fly. If your email is [email protected], you can use [email protected], etc.

Interesting News

Passwords And Passphrases, Your Most Common Security Measure

Passphrase Vaulting

Lastpass

Filed Under: Privacy, Security

Privacy and Security News and Tips 20160322

March 22, 2016 by ATTOG Technologies Leave a Comment

There are two types of encryption: one that will prevent your sister from reading your diary and one that will prevent your government. — Bruce Schneier

Weekly Tip

With Apple and the FBI scheduled to testify in court today (since postponed), and the release of iOS 9.3 yesterday, I wanted to talk about encryption.this week. Encryption; its use, weaknesses, and the stigma that gets attached by those that do not understand its intrinsic value is forefront in the news and my mind.

Protecting your Personally Identifiable Information

It is your right and duty to demand strong, secure, and unbreakable encryption if you are at all interested in protecting your personal information from those out to do you harm. Use the latest and most secure version of your phone and/or tablet’s operating system and make sure to enable encryption. Look for and demand that any online transactions are secure, be it a login, contact form, shopping cart, financial site, etc. If you must send something through email that you want to keep private and secure, make sure to use a secure email system such as Protonmail, ZSentry, PGP, or something else that can be vetted and trusted.

Encryption is at work in our lives everyday, from our banking, email, texting (sometimes), to our medical records, online shopping, and more. There have been times both recent and past where our government has legislated to weaken or disable encryption for a variety of reasons. Weakening export encryption, requiring backdoors, and requesting master keys is detrimental to the security of our everyday lives as well as our rights to privacy.

Interesting News 

Big tech companies want to make email more secure

Symantec warns of serious security holes – in Symantec security kit

McAfee Uses Web Beacons That Can Be Used To Track Users, Serve Advertising

ProtonMail’s encrypted email is now available to all

FTC warns app developers against using audio monitoring software

Filed Under: Privacy, Security

Privacy and Security News and Tips 20160315

March 15, 2016 by ATTOG Technologies Leave a Comment

Eternal vigilance is the price of liberty. — Wendell Phillips

Protecting your Personally Identifiable Information

This week I want you to think about how vulnerable you are when you are in public. When you go to a restaurant, bar, or even a class, think about what others are looking at and noticing. When you leave the table, do you take your phone, tablet, laptop and keys with you? Do you make a habit of putting your phone on the table when you get somewhere so that you can see if you get a message or a call? Do you leave your wallet on the table, your purse on the floor or the back of your chair? Do you leave your wallet or possibly a gun in your coat pocket hung over the back of a chair? What about at the office? What about at home?

If you do not trust everyone implicitly that could come in contact with your private items in the location you are at, then you need to be aware of what you leave for them to interact with. Think about taking it with you, not having it there in the first place, or locking it up.

Interesting News

Your Browser’s Private Mode Isn’t as Secret as You Think

Hackers prove how easy it is to invade smart homes – but there’s a silver lining

Patch Tuesday Brought Windows 10 Ad Generator

Surprising map of the Internet shows tiny U.S. and huge mystery island

Filed Under: Privacy, Security

What Is SPAM And How Not To Be A SPAMMER

March 9, 2016 by ATTOG Technologies Leave a Comment

Email spam, also known as junk email or unsolicited bulk email (UBE), is a subset of electronic spam involving nearly identical messages sent to numerous recipients by email. The messages may contain disguised links that appear to be for familiar websites but in fact lead to phishing web sites or sites that are hosting malware. Spam email may also include malware as scripts or other executable file attachments. Definitions of spam usually include the aspects that email is unsolicited and sent in bulk. One subset of UBE is UCE (unsolicited commercial email). The opposite of “spam”, email which one wants, is sometimes called “ham”. Like other forms of unwanted bulk messaging, it is named for Spam luncheon meat by way of a Monty Python sketch in which Spam is depicted as ubiquitous and unavoidable.

Email spam has steadily grown since the early 1990s. Botnets, networks of virus-infected computers, are used to send about 80% of spam. Since the expense of the spam is borne mostly by the recipient, it is effectively postage due advertising.

The legal status of spam varies from one jurisdiction to another. In the United States, spam was declared to be legal by the CAN-SPAM Act of 2003 provided the message adheres to certain specifications. ISPs have attempted to recover the cost of spam through lawsuits against spammers, although they have been mostly unsuccessful in collecting damages despite winning in court.

Spammers collect email addresses from chatrooms, websites, customer lists, newsgroups, and viruses which harvest users’ address books, and are sold to other spammers. They also use a practice known as “email appending” or “epending” in which they use known information about their target (such as a postal address) to search for the target’s email address. Much of spam is sent to invalid email addresses. According to the Message Anti-Abuse Working Group, the amount of spam email was between 88–92% of email messages sent in the first half of 2010.

Overview

From the beginning of the Internet (the ARPANET), sending of junk email has been prohibited. Gary Thuerk sent the first email spam message in 1978 to 600 people. He was reprimanded and told not to do it again. The ban on spam is enforced by the Terms of Service/Acceptable Use Policy (ToS/AUP) of internet service providers (ISPs) and peer pressure. Even with a thousand users junk email for advertising is not tenable, and with a million users it is not only impractical, but also expensive. It was estimated that spam cost businesses on the order of $100 billion in 2007. As the scale of the spam problem has grown, ISPs and the public have turned to government for relief from spam, which has failed to materialize.

Types

Spam has several definitions varying by source.

  • Unsolicited bulk email (UBE)—unsolicited email, sent in large quantities.
  • Unsolicited commercial email (UCE)—this more restrictive definition is used by regulators whose mandate is to regulate commerce, such as the U.S. Federal Trade Commission.

Spamvertised sites

Many spam emails contain URLs to a website or websites. According to a Cyberoam report in 2014, there are an average of 54 billion spam messages sent every day. “Pharmaceutical products (Viagra and the like) jumped up 45% from last quarter’s analysis, leading this quarter’s spam pack. Emails purporting to offer jobs with fast, easy cash come in at number two, accounting for approximately 15% of all spam email. And, rounding off at number three are spam emails about diet products (such as Garcinia gummi-gutta or Garcinia Cambogia), accounting for approximately 1%.”

419 scams

Advance fee fraud spam such as the Nigerian “419” scam may be sent by a single individual from a cybercafé in a developing country. Organized “spam gangs” operate from sites set up by the Russian mafia, with turf battles and revenge killings sometimes resulting.

Phishing

Spam is also a medium for fraudsters to scam users into entering personal information on fake Web sites using emails forged to look like they are from banks or other organizations, such as PayPal. This is known as phishing. Targeted phishing, where known information about the recipient is used to create forged emails, is known as spear-phishing.

Spam techniques

Appending

If a marketer has one database containing names, addresses, and telephone numbers of customers, they can pay to have their database matched against an external database containing email addresses. The company then has the means to send email to people who have not requested email, which may include people who have deliberately withheld their email address.

Image spam

Image spam, or image-based spam, is an obfuscating method in which the text of the message is stored as a GIF or JPEG image and displayed in the email. This prevents text-based spam filters from detecting and blocking spam messages. Image spam was reportedly used in the mid-2000s to advertise “pump and dump” stocks.

Often, image spam contains nonsensical, computer-generated text which simply annoys the reader. However, new technology in some programs tries to read the images by attempting to find text in these images. These programs are not very accurate, and sometimes filter out innocent images of products, such as a box that has words on it.

A newer technique, however, is to use an animated GIF image that does not contain clear text in its initial frame, or to contort the shapes of letters in the image (as in CAPTCHA) to avoid detection by optical character recognition tools.

Blank spam

Blank spam is spam lacking a payload advertisement. Often the message body is missing altogether, as well as the subject line. Still, it fits the definition of spam because of its nature as bulk and unsolicited email.

Blank spam may be originated in different ways, either intentional or unintentionally:

  1. Blank spam can have been sent in a directory harvest attack, a form of dictionary attack for gathering valid addresses from an email service provider. Since the goal in such an attack is to use the bounces to separate invalid addresses from the valid ones, spammers may dispense with most elements of the header and the entire message body, and still accomplish their goals.
  2. Blank spam may also occur when a spammer forgets or otherwise fails to add the payload when he or she sets up the spam run.
  3. Often blank spam headers appear truncated, suggesting that computer glitches may have contributed to this problem—from poorly written spam software to malfunctioning relay servers, or any problems that may truncate header lines from the message body.
  4. Some spam may appear to be blank when in fact it is not. An example of this is the VBS.Davinia.B email worm which propagates through messages that have no subject line and appears blank, when in fact it uses HTML code to download other files.

Backscatter spam

Backscatter is a side-effect of email spam, viruses and worms, where email servers receiving spam and other mail send bounce messages to an innocent party. This occurs because the original message’s envelope sender is forged to contain the email address of the victim. A very large proportion of such email is sent with a forged From: header, matching the envelope sender.

Since these messages were not solicited by the recipients, are substantially similar to each other, and are delivered in bulk quantities, they qualify as unsolicited bulk email or spam. As such, systems that generate email backscatter can end up being listed on various DNSBLs and be in violation of internet service providers’ Terms of Service.

Legality

Sending spam violates the acceptable use policy (AUP) of almost all Internet service providers. Providers vary in their willingness or ability to enforce their AUPs. Some actively enforce their terms and terminate spammers’ accounts without warning. Some ISPs lack adequate personnel or technical skills for enforcement, while others may be reluctant to enforce restrictive terms against profitable customers.

As the recipient directly bears the cost of delivery, storage, and processing, one could regard spam as the electronic equivalent of “postage-due” junk mail. Due to the low cost of sending unsolicited email and the potential profit entailed, some believe that only strict legal enforcement can stop junk email. The Coalition Against Unsolicited Commercial Email (CAUCE) argues “Today, much of the spam volume is sent by career criminals and malicious hackers who won’t stop until they’re all rounded up and put in jail.”

European Union

All the countries of the European Union have passed laws that specifically target spam.

Article 13 of the European Union Directive on Privacy and Electronic Communications (2002/58/EC) provides that the EU member states shall take appropriate measures to ensure that unsolicited communications for the purposes of direct marketing are not allowed either without the consent of the subscribers concerned or in respect of subscribers who do not wish to receive these communications, the choice between these options to be determined by national legislation.

In the United Kingdom, for example, unsolicited emails cannot be sent to an individual subscriber unless prior permission has been obtained or unless there is a previous relationship between the parties. The regulations can be enforced against an offending company or individual anywhere in the European Union. The Information Commissioner’s Office has responsibility for the enforcement of unsolicited emails and considers complaints about breaches. A breach of an enforcement notice is a criminal offense subject to a fine of up to £500,000.

Canada

The Government of Canada has passed anti-spam legislation called the Fighting Internet and Wireless Spam Act to fight spam.

Australia

In Australia, the relevant legislation is the Spam Act 2003, which covers some types of email and phone spam and took effect on 11 April 2004. The Spam Act provides that “Unsolicited commercial electronic messages must not be sent.” Whether an email is unsolicited depends on whether the sender has consent. Consent can be express or inferred. Express consent is when someone directly instructs a sender to send them emails, e.g. by opting in. Consent can also be inferred from the business relationship between the sender and recipient or if the recipient conspicuously publishes their email address in a public place (such as on a website). Penalties are up to 10,000 penalty units, or 2,000 penalty units for a person other than a body corporate.

United States

In the United States, most states enacted anti-spam laws during the late 1990s and early 2000s. Many of these have since been pre-empted by the less restrictive CAN-SPAM Act of 2003 (“CAN-SPAM“).

Spam is legally permissible according to CAN-SPAM, provided it meets certain criteria: a “truthful” subject line, no forged information in the technical headers or sender address, and other minor requirements. If the spam fails to comply with any of these requirements it is illegal. Aggravated or accelerated penalties apply if the spammer harvested the email addresses using methods described earlier.

A review of the effectiveness of CAN-SPAM in 2005 by the Federal Trade Commission (the agency charged with CAN-SPAM enforcement) stated that the amount of sexually explicit spam had significantly decreased since 2003 and the total volume had begun to level off. Senator Conrad Burns, a principal sponsor, noted that “Enforcement is key regarding the CAN-SPAM legislation.” In 2004, less than one percent of spam complied with CAN-SPAM. In contrast to the FTC evaluation, many observers view CAN-SPAM as having failed in its purpose of reducing spam.

Other laws

Accessing privately owned computer resources without the owner’s permission is illegal under computer crime statutes in most nations. Deliberate spreading of computer viruses is also illegal in the United States and elsewhere. Thus, some common behaviors of spammers are criminal regardless of the legality of spamming per se. Even before the advent of laws specifically banning or regulating spamming, spammers were successfully prosecuted under computer fraud and abuse laws for wrongfully using others’ computers.

The use of botnets can be perceived as theft. The spammer consumes a zombie owner’s bandwidth and resources without any cost. In addition, spam is perceived as theft of services. The receiving SMTP servers consume significant amounts of system resources dealing with this unwanted traffic. As a result, service providers have to spend large amounts of money to make their systems capable of handling these amounts of email. Such costs are inevitably passed on to the service providers’ customers.

Other laws, not only those related to spam, have been used to prosecute alleged spammers. For example, Alan Ralsky was indicted on stock fraud charges in January 2008, and Robert Soloway pled guilty in March 2008 to charges of mail fraud, fraud in connection with email, and failing to file a tax return.

Deception and fraud

Spammers may engage in deliberate fraud to send out their messages. Spammers often use false names, addresses, phone numbers, and other contact information to set up “disposable” accounts at various Internet service providers. They also often use falsified or stolen credit card numbers to pay for these accounts. This allows them to move quickly from one account to the next as the host ISPs discover and shut down each one.

Senders may go to great lengths to conceal the origin of their messages. Large companies may hire another firm to send their messages so that complaints or blocking of email falls on a third party. Others engage in spoofing of email addresses (much easier than IP address spoofing). The email protocol (SMTP) has no authentication by default, so the spammer can pretend to originate a message apparently from any email address. To prevent this, some ISPs and domains require the use of SMTP-AUTH, allowing positive identification of the specific account from which an email originates.

Senders cannot completely spoof email delivery chains (the ‘Received’ header), since the receiving mailserver records the actual connection from the last mailserver’s IP address. To counter this, some spammers forge additional delivery headers to make it appear as if the email had previously traversed many legitimate servers.

Spoofing can have serious consequences for legitimate email users. Not only can their email inboxes get clogged up with “undeliverable” emails in addition to volumes of spam, they can mistakenly be identified as a spammer. Not only may they receive irate email from spam victims, but (if spam victims report the email address owner to the ISP, for example) a naive ISP may terminate their service for spamming.

Theft of service

Spammers frequently seek out and make use of vulnerable third-party systems such as open mail relays and open proxy servers. SMTP forwards mail from one server to another—mail servers that ISPs run commonly require some form of authentication to ensure that the user is a customer of that ISP. Open relays, however, do not properly check who is using the mail server and pass all mail to the destination address, making it harder to track down spammers.

Increasingly, spammers use networks of malware-infected PCs (zombies) to send their spam. Zombie networks are also known as botnets (such zombifying malware is known as a bot, short for robot). In June 2006, an estimated 80 percent of email spam was sent by zombie PCs, an increase of 30 percentfrom the prior year. An estimated 55 billion email spam were sent each day in June 2006, an increase of 25 billion per day from June 2005.

For the first quarter of 2010, an estimated 305,000 newly activated zombie PCs were brought online each day for malicious activity. This number is slightly lower than the 312,000 of the fourth quarter of 2009.

Brazil produced the most zombies in the first quarter of 2010. Brazil was the source of 20 percent of all zombies, which is down from 14 percent from the fourth quarter of 2009. India had 10 percent, with Vietnam at 8 percent, and the Russian Federation at 7 percent.

Side effects

To combat the problems posed by botnets, open relays, and proxy servers, many email server administrators pre-emptively block dynamic IP ranges and impose stringent requirements on other servers wishing to deliver mail. Forward-confirmed reverse DNS must be correctly set for the outgoing mail server and large swaths of IP addresses are blocked, sometimes pre-emptively, to prevent spam. These measures can pose problems for those wanting to run a small email server off an inexpensive domestic connection. Blacklisting of IP ranges due to spam emanating from them also causes problems for legitimate email servers in the same IP range.

Statistics and estimates

The total volume of email spam has been consistently growing, but in 2011 the trend seems to have reversed. The amount of spam users see in their mailboxes is only a portion of total spam sent, since spammers’ lists often contain a large percentage of invalid addresses and many spam filters simply delete or reject “obvious spam.”

The first known spam email, advertising a DEC product presentation, was sent in 1978 by Gary Thuerk to 600 addresses, which was all the users of ARPANET at the time, though software limitations meant only slightly more than half of the intended recipients actually received it. As of August 2010, the amount of spam was estimated to be around 200 billion spam messages sent per day, More than 97% of all emails sent over the Internet are unwanted, according to a Microsoft security report. MAAWG estimates that 85% of incoming mail is “abusive email”, as of the second half of 2007. The sample size for the MAAWG’s study was over 100 million mailboxes.

A 2010 survey of US and European email users showed that 46% of the respondents had opened spam messages, although only 11% had clicked on a link.

Highest amount of spam received

According to Steve Ballmer, Microsoft founder Bill Gates receives four million emails per year, most of them spam. This was originally incorrectly reported as “per day”.

At the same time Jef Poskanzer, owner of the domain name acme.com, was receiving over one million spam emails per day.

Cost of spam

A 2004 survey estimated that lost productivity costs Internet users in the United States $21.58 billion annually, while another reported the cost at $17 billion, up from $11 billion in 2003. In 2004, the worldwide productivity cost of spam has been estimated to be $50 billion in 2005. An estimate of the percentage cost borne by the sender of marketing junk mail (snail mail) is 88 percent, whereas in 2001 one spam was estimated to cost $0.10 for the receiver and $0.00001 (0.01% of the cost) for the sender.

Origin of spam

Origin or source of spam refers to the geographical location of the computer from which the spam is sent; it is not the country where the spammer resides, nor the country that hosts the spamvertised site. Because of the international nature of spam, the spammer, the hijacked spam-sending computer, the spamvertised server, and the user target of the spam are all often located in different countries. As much as 80% of spam received by Internet users in North America and Europe can be traced to fewer than 200 spammers.

In terms of number of IP addresses: the Spamhaus Project (which measures spam sources in terms of number of IP addresses used for spamming, rather than volume of spam sent) ranks the top three as the United States, China, and Russia, followed by Japan, Canada, and South Korea.

In terms of networks: As of 5 June 2007, the three networks hosting the most spammers are Verizon, AT&T, and VSNL International. Verizon inherited many of these spam sources from its acquisition of MCI, specifically through the UUNet subsidiary of MCI, which Verizon subsequently renamed Verizon Business.

Anti-spam techniques

The U.S. Department of Energy Computer Incident Advisory Capability (CIAC) has provided specific countermeasures against email spamming.

Some popular methods for filtering and refusing spam include email filtering based on the content of the email, DNS-based blackhole lists (DNSBL), greylisting, spamtraps, enforcing technical requirements of email (SMTP), checksumming systems to detect bulk email, and by putting some sort of cost on the sender via a proof-of-work system or a micropayment. Each method has strengths and weaknesses and each is controversial because of its weaknesses. For example, one company’s offer to “[remove] some spamtrap and honeypot addresses” from email lists defeats the ability for those methods to identify spammers.

Outbound spam protection combines many of the techniques to scan messages exiting out of a service provider’s network, identify spam, and taking action such as blocking the message or shutting off the source of the message.

In one study, 95 percent of revenues (in the study) cleared through just three banks.

How spammers operate

Gathering of addresses

In order to send spam, spammers need to obtain the email addresses of the intended recipients. To this end, both spammers themselves and list merchants gather huge lists of potential email addresses. Since spam is, by definition, unsolicited, this address harvesting is done without the consent (and sometimes against the expressed will) of the address owners. As a consequence, spammers’ address lists are inaccurate. A single spam run may target tens of millions of possible addresses – many of which are invalid, malformed, or undeliverable.

Sometimes, if the sent spam is “bounced” or sent back to the sender by various programs that eliminate spam, or if the recipient clicks on an unsubscribe link, that may cause that email address to be marked as “valid”, which is interpreted by the spammer as “send me more”. This is illegal with the passage of anti-spam legislation, however. Thus a recipient should not automatically assume the unsubscribe link is an invitation to be sent more messages. If the originating company is legitimate and the content of the message is legitimate, then individuals should unsubscribe to messages they no longer wish to receive.

Delivering spam messages

Obfuscating message content

Many spam-filtering techniques work by searching for patterns in the headers or bodies of messages. For instance, a user may decide that all email they receive with the word “Viagra” in the subject line is spam, and instruct their mail program to automatically delete all such messages. To defeat such filters, the spammer may intentionally misspell commonly filtered words or insert other characters, often in a style similar to leetspeak, as in the following examples: V1agra, Via'gra, [email protected], vi*gra, \/iagra. This also allows for many different ways to express a given word, making identifying them all more difficult for filter software.

The principle of this method is to leave the word readable to humans (who can easily recognize the intended word for such misspellings), but not likely to be recognized by a literal computer program. This is only somewhat effective, because modern filter patterns have been designed to recognize blacklisted terms in the various iterations of misspelling. Other filters target the actual obfuscation methods, such as the non-standard use of punctuation or numerals into unusual places. Similarly, HTML-based email gives the spammer more tools to obfuscate text. Inserting HTML comments between letters can foil some filters, as can including text made invisible by setting the font color to white on a white background, or shrinking the font size to the smallest fine print. Another common ploy involves presenting the text as an image, which is either sent along or loaded from a remote server. This can be foiled by not permitting an email-program to load images.

As Bayesian filtering has become popular as a spam-filtering technique, spammers have started using methods to weaken it. To a rough approximation, Bayesian filters rely on word probabilities. If a message contains many words that are used only in spam, and few that are never used in spam, it is likely to be spam. To weaken Bayesian filters, some spammers, alongside the sales pitch, now include lines of irrelevant, random words, in a technique known as Bayesian poisoning. A variant on this tactic may be borrowed from the Usenet abuser known as “Hipcrime”—to include passages from books taken from Project Gutenberg, or nonsense sentences generated with “dissociated press” algorithms. Randomly generated phrases can create spoetry (spam poetry) or spam art. The perceived credibility of spam messages by users differs across cultures; for example, Korean unsolicited email frequently uses apologies, likely to be based on Koreans’ modeling behavior and a greater tendency to follow social norms.

Another method used to masquerade spam as legitimate messages is the use of autogenerated sender names in the From: field, ranging from realistic ones such as “Jackie F. Bird” to (either by mistake or intentionally) bizarre attention-grabbing names such as “Sloppiest U. Epiglottis” or “Attentively E. Behavioral”. Return addresses are also routinely auto-generated, often using unsuspecting domain owners’ legitimate domain names, leading some users to blame the innocent domain owners. Blocking lists use IP addresses rather than sender domain names, as these are more accurate. A mail purporting to be from example.com can be seen to be faked by looking for the originating IP address in the email’s headers; also Sender Policy Framework, for example, helps by stating that a certain domain will send email only from certain IP addresses.

Spam can also be hidden inside a fake “Undelivered mail notification” which looks like the failure notices sent by a mail transfer agent (a “MAILER-DAEMON”) when it encounters an error.

Spam-support services

A number of other online activities and business practices are considered by anti-spam activists to be connected to spamming. These are sometimes termed spam-support services: business services, other than the actual sending of spam itself, which permit the spammer to continue operating. Spam-support services can include processing orders for goods advertised in spam, hosting Web sites or DNS records referenced in spam messages, or a number of specific services as follows:

Some Internet hosting firms advertise bulk-friendly or bulletproof hosting. This means that, unlike most ISPs, they will not terminate a customer for spamming. These hosting firms operate as clients of larger ISPs, and many have eventually been taken offline by these larger ISPs as a result of complaints regarding spam activity. Thus, while a firm may advertise bulletproof hosting, it is ultimately unable to deliver without the connivance of its upstream ISP. However, some spammers have managed to get what is called a pink contract (see below) – a contract with the ISP that allows them to spam without being disconnected.

A few companies produce spamware, or software designed for spammers. Spamware varies widely, but may include the ability to import thousands of addresses, to generate random addresses, to insert fraudulent headers into messages, to use dozens or hundreds of mail servers simultaneously, and to make use of open relays. The sale of spamware is illegal in eight U.S. states.

So-called millions CDs are commonly advertised in spam. These are CD-ROMs purportedly containing lists of email addresses, for use in sending spam to these addresses. Such lists are also sold directly online, frequently with the false claim that the owners of the listed addresses have requested (or “opted in”) to be included. Such lists often contain invalid addresses. In recent years, these have fallen almost entirely out of use due to the low quality email addresses available on them, and because some email lists exceed 20GB in size. The amount you can fit on a CD is no longer substantial.

A number of DNS blacklists (DNSBLs), including the MAPS RBL, Spamhaus SBL, SORBS and SPEWS, target the providers of spam-support services as well as spammers. DNSBLs blacklist IPs or ranges of IPs to persuade ISPs to terminate services with known customers who are spammers or resell to spammers.

Related vocabulary

Unsolicited bulk email (UBE) A synonym for email spam.

Unsolicited commercial email (UCE) Spam promoting a commercial service or product. This is the most common type of spam, but it excludes spams that are hoaxes (e.g. virus warnings), political advocacy, religious messages and chain letters sent by a person to many other people. The term UCE may be most common in the USA.

Pink contract A pink contract is a service contract offered by an ISP which offers bulk email service to spamming clients, in violation of that ISP’s publicly posted acceptable use policy.

Spamvertising Spamvertising is advertising through the medium of spam.

Opt-in, confirmed opt-in, double opt-in, opt-out Opt-in, confirmed opt-in, double opt-in, opt-out refers to whether the people on a mailing list are given the option to be put in, or taken out, of the list. Confirmation (and “double”, in marketing speak) refers to an email address transmitted e.g. through a web form being confirmed to actually request joining a mailing list, instead of being added to the list without verification.

Final, Ultimate Solution for the Spam Problem (FUSSP) An ironic reference to naïve developers who believe they have invented the perfect spam filter, which will stop all spam from reaching users’ inboxes while deleting no legitimate email accidentally.

Bacn Bacn is email that has been subscribed to and is therefore solicited. Bacn has been described as “email you want but not right now.” Some examples of common bacn messages are news alerts, periodic messages from e-merchants from whom one has made previous purchases, messages from social networking sites, and wiki watch lists. The name bacn is meant to convey the idea that such email is “better than spam, but not as good as a personal email”. It was originally coined in August 2007 at PodCamp Pittsburgh 2, and since then has been used amongst the blogging community.

Filed Under: email, Microsoft, Security

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