Trojan.Nullpos

Risk Level 1: Very Low

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Discovered:: August 12, 2004
Updated:: February 13, 2007 12:26:22 PM
Also Known As:: Trojan.Win32.Nullpos.c [Kasper, W32/Bugfixer.gen [McAfee], TROJ_NULLPOS.C [Trend Micro]
Type:: Trojan Horse
Systems Affected:: Windows 2000, Windows 95, Windows 98, Windows Me, Windows NT, Windows XP

Trojan.Nullpos is a Trojan horse program that modifies the screen saver settings to display a message written in Japanese. It also moves all the desktop icons to the "My Document" folder. The Trojan spreads using the Winny file-sharing network.

Antivirus Protection Dates

Initial Rapid Release version August 12, 2004
Latest Rapid Release version September 28, 2010 revision 054
Initial Daily Certified version August 12, 2004
Latest Daily Certified version September 28, 2010 revision 036
Initial Weekly Certified release date August 18, 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: Low

Distribution

Distribution Level: Low

Writeup By: Hiroshi Shinotsuka

Technical Details

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Internet Security Threat Report, Volume 16