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  3. Trojan.Welomoch


Risk Level 1: Very Low

December 6, 2005
February 13, 2007 12:49:40 PM
Trojan Horse
Systems Affected:
Windows 2000, Windows 95, Windows 98, Windows Me, Windows NT, Windows Server 2003, Windows XP

Trojan.Welomoch is a Trojan horse that attempts to utilize XCP software to hide W32.HLLW.Antinny, which it drops on to the compromised computer. The XCP software is installed by inserting certain Sony BMG content-protected music CDs into the computer.

Antivirus Protection Dates

  • Initial Rapid Release version December 6, 2005
  • Latest Rapid Release version January 20, 2015 revision 006
  • Initial Daily Certified version December 6, 2005
  • Latest Daily Certified version January 20, 2015 revision 019
  • Initial Weekly Certified release date December 7, 2005
Click here for a more detailed description of Rapid Release and Daily Certified virus definitions.

Threat Assessment


  • Wild Level: Low
  • Number of Infections: 0 - 49
  • Number of Sites: 0 - 2
  • Geographical Distribution: Low
  • Threat Containment: Easy
  • Removal: Moderate


  • Damage Level: Low


  • Distribution Level: Low
Note: On May 14, 2015, modifications will be made to the threat write-ups to streamline the content. The Threat Assessment section will no longer be published as this section is no longer relevant to today's threat landscape. The Risk Level will continue to be the main threat risk assessment indicator.
Writeup By: Kazumasa Itabashi

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