image spam


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image spam

An e-mail advertisement in the form of an image in the message rather than text in order to avoid detection as spam. Spam filters typically analyze words in a message, which is relatively fast, but scanning images with optical character recognition (OCR) to extract the text is slow. In addition, spammers have already circumvented optical scanning by fracturing the text within the image similar to the CAPTCHAs on Web page forms (see CAPTCHA). Animated GIFs are also used to spread the text across multiple frames, making it harder to analyze.

Message Fingerprinting
Another defense is to track known image spam and save the attributes of their text and images as signatures that can be quickly analyzed. In many cases, the fingerprint need only be of the image. Although this is a faster detection approach, keeping up with the latest image spam signatures is like keeping virus signatures up-to-date. See spam and OCR.


Not Exactly Clear
Many spam images are legible to a human, but this one from Korea-based CLC Holding Company is barely readable. Images such as this are sent because spammers are counting on the one person in 10,000 who will actually take the time to decipher it.
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The domain of using image Spam for Steganography is yet to be exploited.
The medium or the message--Dealing with image spam, Virus Bulletin Magazine, December 2006, (www.
Image spam continued its decline and dropped to 3%, compared to 60% last year.
TRACE said the growing amount of image spam coincides with a fall in the amount of spam containing embedded clickable URL links, which has fallen to around 55% of spam, compared to 96% in 2004.
This meant that Mail-Secure users experienced zero degradation with no false positives from the very first PDF image spam attacks.
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99% against all threats, including spam, image spam, phish, zombies, denial of service, and directory harvest attacks with a false positive rate of 0.
Barracuda Networks Inc, a provider of spam firewall solutions, announced on Thursday (22 February) the availability of its third generation of image spam defence enhancements to the Barracuda Spam Firewall.
Barracuda has reportedly seen a more than 67% increase in overall spam volume and a 500% increase in image spam since August 2006.
Image spam - Spammers are bringing back this tried and true tactic, where text is incorporated into an attached graphic; image spam spiked to 10 percent of all spam.
Vircom ensures complete protection for its customers by staying ahead of the competition in the fight to combat the latest email threats, such as spambots, spoofing, image spam, increasingly sophisticated phishing attempts, and fast flux attacks.
Adaptive Image Filtering (AIF) technology has been introduced by Tumbleweed Communications Corp (Tumbleweed) (Nasdaq:TMWD), a provider of messaging security solutions, intended to fight the growing volume of image spam.