Threat Description

Riskware:​W32/mIRC

Details

Aliases: Client-irc.win32.mirc
Category: Riskware
Type: Riskware
Platform: W32

Summary



Useful, legitimate software which could possibly be misused for malicious purposes.



Removal



Automatic Disinfection

Allow F-Secure Anti-Virus to disinfect the relevant files.

For more general information on disinfection, please see Removal Instructions.



Technical Details



Riskware:W32/mIRC is an Internet Relay Chat (IRC) client that can be silently subverted by malware to become a backdoor. By itself, the program is not malicious.

Activity

Malware such asBackdoor:W32/Zapchast and its variants can use malicious configuration files to turn the mIRC-client into a backdoor. The malicious configuration files are detected as Backdoor.IRC.Zapchast.

In addition to subverting the mIRC client, these files will also contain the name of an IRC channel which the mIRC-client will automatically try to join on each startup.

Sometimes, Zapchast variants will use additional batch files which provide added functionality, such as performing registry changes to create a launchpoint for the backdoor. These auxiliary batch files are detected as Trojan.BAT.Zapchast.






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