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


Risk Level 2: Low

September 16, 2003
February 13, 2007 12:07:28 PM
Systems Affected:

W32.Yaha.AA@mm is a variant of the W32.Yaha.T@mm worm that does the following:
  • Terminates some antivirus and firewall processes.
  • Uses its own SMTP engine to email itself to all the contacts in the Windows Address Book, MSN Messenger, .NET Messenger, Yahoo Pager, ICQ Pager, as well as in all the files whose extensions contain the letters HT.
  • Installs a keylogger and emails the logs to its author.
  • Contains a destructive payload that may be triggered if the system time zone is GMT+5.
  • Performs Denial of Service (DoS) attack to some specified and random hosts on ports 80, 135, 139, and 445.

The email message has a randomly chosen subject line, message, and attachment name. The attachment will have a .com, .exe, .scr, or .zip file extension.

This threat is written in the Microsoft Visual C++ programming language and is compressed with Aspack.

Antivirus Protection Dates

  • Initial Rapid Release version September 17, 2003
  • Latest Rapid Release version September 28, 2010 revision 054
  • Initial Daily Certified version September 17, 2003
  • Latest Daily Certified version September 28, 2010 revision 036
  • Initial Weekly Certified release date September 17, 2003
Click here for a more detailed description of Rapid Release and Daily Certified virus definitions.
Writeup By: Yana Liu

Search Threats

Search by name
Example: W32.Beagle.AG@mm
STAR Antimalware Protection Technologies
2016 Internet Security Threat Report, Volume 21
  • Twitter
  • Facebook
  • LinkedIn
  • Google+
  • YouTube