Sophos

Mal/Zapchas-A

Category
Type
What to do
Prevalence low high

Summary

 
Affected operating systems Windows
Characteristics
  • Installs itself in the registry
Included in our products from April 2007 (4.16)
Protection available since 13 February 2007 20:05:08 (GMT)
Last updated 2 March 2007 20:57:03 (GMT)
Detected by All Sophos products

Action

Your options

More Information

Mal/Zapchas-A is a family of Trojans for the Windows platform.

Members of Mal/Zapchas-A run continuously in the background, providing a backdoor server which allows a remote intruder to gain access and control over the computer via IRC channels.

When members of Mal/Zapchas-A are installed some of the following files are typically created:

<Windows>\system\aliases.ini
<Windows>\system\control.ini
<Windows>\system\explorer.exe
<Windows>\system\mirc.ico
<Windows>\system\mirc.ini
<Windows>\system\nicks.txt
<Windows>\system\postcard.gif.exe
<Windows>\system\remote.ini
<Windows>\system\script.ini
<Windows>\system\servers.ini
<Windows>\system\sup.bat
<Windows>\system\sup.reg
<Windows>\system\svchost.exe
<Windows>\system\users.ini

The main dropped executable executable is usually a version of the mIRC chat application, sometimes infected with another virus.

Members of Mal/Zapchas-A often create the following folders:

<Windows>\system\download
<Windows>\system\logs
<Windows>\system\sounds

Members of Mal/Zapchas-A often set a registry entry at the following location to run the main dropped executable:

HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Run

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