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Panda Protection

Virus Encyclopedia

Welcome to the Virus Encyclopedia of Panda Security.

Illwill.A

Threat LevelHigh threatDamageSevereDistributionNot widespread
Common name:Illwill.A
Technical name:JS/Illwill.A
Threat level:Medium
Type:Trojan
Effects:  

It is an exploit that the worm Bagle.AM uses in order to affect computers without users noticing.

Affected platforms:

Windows XP/2000/NT/ME/98/95

First detected on:Aug. 9, 2004
Detection updated on:Aug. 9, 2004
StatisticsNo

Brief Description 

    

Illwill.A is an exploit that the worm Bagle.AM uses in order to affect computers without users noticing.

Illwill.A reaches the computer in a message with no subject and an attached file with a random name and a ZIP extension. This file contains an HTML file (detected by Panda Security as JS/Illwill.A), together with a hidden EXE file.

This executable file, belonging to Bagle.AM, is automatically run when the user opens the HTML file, thinking that it does not have the typical extension that is bound to contain malware (EXE, COM, BAT, CMD, SCR) and thus can be safely run.

Visible Symptoms 

    

Illwill.A is easy to recognize, as it reaches the computer in an e-mail message with the following characteristics:

  • Subject: it is empty.
  • Message:
    new price
  • Attachments:
    The attached file is variable. It has a random name and a ZIP extension. It contains an HTML file, and a hidden EXE file.