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 MBSetup.exe and follow the prompts to install the program.
  3. When your Malwarebytes for Windows installation completes, the program opens to the Welcome to Malwarebytes screen.
  4. Click on the Get started button.
  5. Click Scan to start a Threat Scan.
  6. Click Quarantine to remove the found threats.
  7. Reboot the system if prompted to complete the removal process.

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

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