W95.Bistro

Risk Level 2: Low

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Discovered:: October 24, 2000
Updated:: February 13, 2007 11:34:40 AM
Also Known As:: W95.Troc, W95.Bistro.dr, PE_TROC
Type:: Virus

W95.Bistro is a virus that infects files under Windows 9x. It is currently one of the most complex and difficult to detect 32-bit metamorphic viruses. The virus infects Portable Executable (PE) files, and adds an infected executable into .zip or .rar archive files. Norton AntiVirus, with the latest virus definitions file, detects all known dropper files from the virus as well as other infected files by using the Symantec Striker32 scanning engine.

Antivirus Protection Dates

Initial Rapid Release version October 25, 2000
Latest Rapid Release version October 25, 2000
Initial Daily Certified version October 25, 2000
Latest Daily Certified version October 25, 2000
Initial Weekly Certified release date pending

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: High

Distribution

Distribution Level: Low

Writeup By: Peter Szor

Technical Details

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Internet Security Threat Report, Volume 16