W32.HLLW.Backzat

Risk Level 1: Very Low

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Discovered:: December 26, 2002
Updated:: February 13, 2007 11:41:45 AM
Also Known As:: W32.Backzat.Worm, I-Worm.Batzback.a [KAV], I-Worm.Batzback.b [KAV], Worm.Batzback.A [McAfee], W32/Backzat-A [Sophos], Win32.Backzat.A [CA]
Type:: Worm
Systems Affected:: Windows 2000, Windows 95, Windows 98, Windows Me, Windows NT, Windows XP

W32.HLLW.Backzat is a worm that uses IRC to distribute itself. This worm attempts to delete security software from your computer. Also, it is written in Microsoft Visual C++ and is packed with UPX.

NOTE: Virus definitions dated prior to April 25, 2003 may detect this threat as W32.Backzat.Worm.

Antivirus Protection Dates

Initial Rapid Release version December 26, 2002
Latest Rapid Release version September 28, 2010 revision 054
Initial Daily Certified version December 26, 2002
Latest Daily Certified version September 28, 2010 revision 036
Initial Weekly Certified release date December 30, 2002

Click 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: Medium

Writeup By: Kaoru Hayashi

Technical Details

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Internet Security Threat Report, Volume 16