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- Discovered:
- January 6, 2003
- Updated:
- February 13, 2007 11:42:05 AM
- Also Known As:
- W32/Yaha.M@mm [McAfee]
- Type:
- Worm
- Systems Affected:
- Windows 2000, Windows 95, Windows 98, Windows Me, Windows NT, Windows XP
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 September 28, 2010 revision 054
- Initial Daily Certified version January 7, 2003
- Latest Daily Certified version September 28, 2010 revision 036
- Initial Weekly Certified release date January 8, 2003
Click here for a more detailed description of Rapid Release and Daily Certified virus definitions.
Threat Assessment
Wild
- Wild Level: Low
- Number of Infections: 0 - 49
- Number of Sites: 0 - 2
- Geographical Distribution: Low
- Threat Containment: Easy
- Removal: Moderate
Damage
- Damage Level: Medium
Distribution
- Distribution Level: High
Writeup By: Yana Liu
