Hi!
Thanks, that's interesting to read. In 2000, I've found and suggested the
following in an article I've written for the Virus Bulletin magazine
<http://www.virusbtn.com> :
"[...] Some scanners do not actually scan all files even when set to "scan all
files" or when the mask "*.*" is used. Most of the time at least some infected
.BAT, .VBS and .COM files will be missed if they have non-standard extensions.
This happens when the scanner checks the file extension, not the content, in
order to scan solely for this kind of virus. It would be a good idea for
vendors to make a "smart" scan to find out the (hopefully) correct file format.
If there is more than one possibility (like ASCII text or a .COM file), all
possible supported formats should be scanned. [...]"
You can find this (Title: "The Usual Suspects ? Part 1", Dec 2000) and more
related articles here:
<http://www.av-test.org/sites/references_papers.php3?lang=en>
cheers,
Andreas Marx
CEO, AV-Test.org
<http://www.av-test.org>
Multiple Vendor Anti-Virus Software Detection Evasion Vulnerability through
forged magic byte.
AUTHOR: Andrey Bayora (www.securityelf.org)
For more details, screenshots and examples please read my article "The Magic
of magic byte" at www.securityelf.org . In addition, you will find a sample
"triple headed" program which has 3 different 'execution entry points',
depending on the extension of the file (exe, html or eml) - just change the
extension and the SAME file will be executed by (at least) THREE DIFFERENT
programs! (thanks to contributing author Wayne Langlois from
www.diamondcs.com.au).
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