Backdoor.Sysdot

Risk Level 1: Very Low

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Discovered:: May 14, 2004
Updated:: February 13, 2007 12:23:06 PM
Also Known As:: Backdoor.Throd.a [Kaspersky]
Type:: Trojan Horse
Systems Affected:: Windows 2000, Windows 95, Windows 98, Windows Me, Windows NT, Windows Server 2003, Windows XP

Backdoor.Sysdot is a Backdoor Trojan horse that allows unauthorized remote access to a compromised computer. It also acts as a covert proxy that is capable of accepting and sending information to remote attacker.

This Trojan is written in Delphi and packed by UPX.

Note: The presence of this threat is a possible indication of a vulnerability of Microsoft Internet Explorer (IE). The specific vulnerability is processing bitmap files in version 5 of IE. To date, this exploit only affects Russian versions of Microsoft Windows XP.

Antivirus Protection Dates

Initial Rapid Release version May 14, 2004
Latest Rapid Release version September 28, 2010 revision 054
Initial Daily Certified version May 14, 2004
Latest Daily Certified version September 28, 2010 revision 036
Initial Weekly Certified release date May 19, 2004

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: Low

Writeup By: Ying Lin

Technical Details

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Internet Security Threat Report, Volume 16