Short bio

Backdoor.Zapchast is Malwarebytes’ detection name for a family of Trojans that installs an mIRC client on the affected system.

Type and source of the infection

Backdoor.Zapchast allows the threat actor to take control of the affected system. They often deploy a keylogger given this chance.
These Trojans are spread by email as attachments most of the time.


Malwarebytes protects users from Backdoor.Zapchast by using real-time potection.

block Backdoor.Zapchast

Malwarebytes blocks Backdoor.Zapchast


Malwarebytes can remove Backdoor.Zapchast without further user interaction.

  1. Please download Malwarebytes to your desktop.
  2. Double-click mb3-setup-consumer-{version}.exe and follow the prompts to install the program.
  3. Then click Finish.
  4. Once the program has fully updated, select Scan Now on the Dashboard. Or select the Threat Scan from the Scan menu.
  5. If another update of the definitions is available, it will be implemented before the rest of the scanning procedure.
  6. When the scan is complete, make sure that all Threats are selected, and click Remove Selected.
  7. Restart your computer when prompted to do so.

You may find additional malware if this Trojan has been active.

Select your language