1. Symantec/
  2. Security Response/
  3. W32.Yaha.M@mm


Risk Level 2: Low

January 6, 2003
February 13, 2007 11:42:05 AM
Also Known As:
W32/Yaha.M@mm [McAfee]
Systems Affected:

The W32.Yaha.M@mm worm is a variant of W32.Yaha.L@mm. This variant of the worm terminates some antivirus and firewall processes. This worm uses its own SMTP engine to email itself to all the contacts in the Windows Address Book, MSN Messenger, .NET Messenger, Yahoo Pager, and all the files whose extensions contain the letters HT. The email message has a randomly chosen subject line, message, and attachment.

This threat is written in the Microsoft C++ language and is compressed with UPX. The uncompressed size is about 60 KB.

Antivirus Protection Dates

  • Initial Rapid Release version January 7, 2003
  • Latest Rapid Release version August 8, 2016 revision 023
  • Initial Daily Certified version January 7, 2003
  • Latest Daily Certified version August 9, 2016 revision 001
  • Initial Weekly Certified release date January 8, 2003
Click here for a more detailed description of Rapid Release and Daily Certified virus definitions.
Writeup By: Yana Liu

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STAR Antimalware Protection Technologies
2016 Internet Security Threat Report, Volume 21
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