W32.Junkcomp

Risk Level 1: Very Low

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Discovered:: January 7, 2003
Updated:: February 13, 2007 11:52:44 AM
Also Known As:: Win32.Junkcomp [KAV], PE_SUNDER.A [Trend]
Type:: Virus
Systems Affected:: Windows 2000, Windows 95, Windows 98, Windows Me, Windows NT, Windows XP

W32.Junkcomp is a polymorphic virus that infects the Portable Executable (PE) files.

Under some circumstances, W32.Junkcomp can corrupt files instead of infecting them. Such corrupted files have random data appended at the end, and possibly some slight modifications in the PE header; however, they should still be functional. The files usually will not be detected, since the virus is not present in them.

W32.Junkcomp fails to test for its own presence in infected files, and thus W32.Junkcomp will reinfect them. Each infection cycle makes the file grow by 32 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 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: Easy

Damage

Damage Level: Low

Distribution

Distribution Level: Low

Writeup By: Frederic Perriot

Technical Details

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Internet Security Threat Report, Volume 16