Trojan.AprilFool

Risk Level 1: Very Low

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Discovered:: April 4, 2003
Updated:: February 13, 2007 11:45:20 AM
Also Known As:: Trojan Horse
Type:: Trojan Horse
Systems Affected:: Windows 2000, Windows NT, Windows XP

Trojan.AprilFool is a Trojan Horse that is written in Microsoft Visual Basic 6. In order for it to execute, the Visual Basic (VB) run-time libraries must be installed on your computer.

Trojan.AprilFool works only if Microsoft Exchange is installed. The Trojan may rename your Microsoft Outlook or Outlook Express Inbox to "April Fool."

NOTE: Virus definitions dated prior to April 4, 2003 may detect this threat as Trojan Horse.

Antivirus Protection Dates

Initial Rapid Release version April 4, 2003
Latest Rapid Release version August 20, 2008 revision 017
Initial Daily Certified version April 4, 2003
Latest Daily Certified version August 20, 2008 revision 016
Initial Weekly Certified release date April 9, 2003

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: Jari Kytojoki

Technical Details

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Internet Security Threat Report, Volume 16