Backdoor.Expjan

Risk Level 1: Very Low

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Discovered:: August 26, 2002
Updated:: February 13, 2007 11:40:05 AM
Type:: Trojan Horse
Systems Affected:: Windows 2000, Windows 95, Windows 98, Windows Me, Windows NT, Windows XP

Backdoor.Expjan is a backdoor server (Trojan) that allows unauthorized access to the infected computer. It uses the same icon as Internet Explorer. By default it opens port 2090 on the infected computer.

Antivirus Protection Dates

Initial Rapid Release version August 26, 2002
Latest Rapid Release version March 10, 2011 revision 016
Initial Daily Certified version August 26, 2002
Latest Daily Certified version March 10, 2011 revision 022
Initial Weekly Certified release date August 28, 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: Easy

Damage

Damage Level: Low

Distribution

Distribution Level: Low

Writeup By: Kaoru Hayashi

Technical Details

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Internet Security Threat Report, Volume 16