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W32.Yaha.F@mm

Risk Level 2: Low

Discovered:
June 17, 2002
Updated:
February 13, 2007 11:39:28 AM
Also Known As:
WORM_YAHA.E [Trend], Worm/Lentin.F [Vexira], W32/Yaha.g@MM [McAfee], Yaha.E [F-Secure], W32/Yaha-E [Sophos], Win32.Yaha.E [CA]
Type:
Worm
Systems Affected:
Windows 2000, Windows 95, Windows 98, Windows Me, Windows NT, Windows XP
CVE References:
CVE-2001-0154

W32.Yaha.F@mm is a mass-mailing worm that sends itself to all email addresses that exist in the Microsoft Windows Address Book, the MSN Messenger List, the Yahoo Pager list, the ICQ list, and files that have extensions that contain the letters ht. The worm randomly chooses the subject and body of the email message. The attachment will have a .bat, .pif or .scr file extension. Depending upon the name of the Recycled folder, the worm either copies itself to that folder or to the %Windows% folder.

The name of the file that the worm creates consists of four randomly generated characters between c and y.

It also attempts to terminate antivirus and firewall processes.



Antivirus Protection Dates

  • Initial Rapid Release version June 18, 2002
  • Latest Rapid Release version September 28, 2010 revision 054
  • Initial Daily Certified version June 18, 2002
  • Latest Daily Certified version September 28, 2010 revision 036
  • Initial Weekly Certified release date June 19, 2002
Click here for a more detailed description of Rapid Release and Daily Certified virus definitions.

Threat Assessment

Wild

  • Wild Level: Medium
  • Number of Infections: 50 - 999
  • Number of Sites: More than 10
  • Geographical Distribution: Medium
  • Threat Containment: Easy
  • Removal: Moderate

Damage

  • Damage Level: Medium

Distribution

  • Distribution Level: High
Writeup By: Douglas Knowles

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