Backdoor.Kryost

Risk Level 1: Very Low

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Discovered:: August 26, 2002
Updated:: February 13, 2007 11:40:06 AM
Type:: Trojan Horse
Systems Affected:: Windows 2000, Windows 95, Windows 98, Windows Me, Windows NT, Windows XP

Backdoor.Kryost is a backdoor Trojan that allows unauthorized access to an infected computer through MSN Messenger. It allows remote execution of files and the opening and closing of the CD-ROM drive.

It attempts to delete antivirus software files.

Antivirus Protection Dates

Initial Rapid Release version August 27, 2002
Latest Rapid Release version September 28, 2010 revision 054
Initial Daily Certified version August 27, 2002
Latest Daily Certified version September 28, 2010 revision 036
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: Medium

Distribution

Distribution Level: Low

Writeup By: Douglas Knowles

Technical Details

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Internet Security Threat Report, Volume 16