Trojan:BASH/Qhost.WD

Classification

Malware

Trojan

BASH

Trojan:BASH/Qhost.WD, Qhost.WD, BASH/Qhost.WD, Trojan:BASH/Qhost.WD

Summary

Trojan:BASH/Qhost.WD poses as a Flash Player installer, and performs unauthorized actions upon installation.

Removal

Manual removal

  • Open terminal and change directory to */private/etc/*:
    • $cd /private/etc
  • Use any editing tool you prefer and edit the hosts file:
    • $sudo vim hosts
    Note: You need root privilege to do this.
  • Remove all the following entries from the hosts file:
    • 91.224.160.26 google.com
    • 91.224.160.26 google.co.uk
    • 91.224.160.26 google.co.au
    • 91.224.160.26 google.ca
    • 91.224.160.26 google.us
    • 91.224.160.26 www.google.com
    • 91.224.160.26 www.google.co.uk
    • 91.224.160.26 www.google.com.au
    • 91.224.160.26 www.google.ca
    • 91.224.160.26 www.google.us

Suspect a file is incorrectly detected (a False Positive)?

A False Positive is when a file is incorrectly detected as harmful, usually because its code or behavior resembles known harmful programs. A False Positive will usually be fixed in a subsequent database update without any action needed on your part. If you wish, you may also:

  • Check for the latest database updates

    First check if your F-Secure security program is using the latest detection database updates, then try scanning the file again.

  • Submit a sample

    After checking, if you still believe the file is incorrectly detected, you can submit a sample of it for re-analysis.

    NOTE If the file was moved to quarantine, you need to collect the file from quarantine before you can submit it.

  • Exclude a file from further scanning

    If you are certain that the file is safe and want to continue using it, you can exclude it from further scanning by the F-Secure security product.

    Note You need administrative rights to change the settings.

Find out more

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Submit a sample

Submit a file or URL for further analysis.

Technical Details

Trojan:BASH/Qhost.WD disguises as a Flash Player installer called FlashPlayer.pkg to trick user into installation.

Payload

Upon installation, the trojan hijacks traffic to Google by adding the following entries to the host file:

  • 91.224.160.26 google.com
  • 91.224.160.26 google.co.uk
  • 91.224.160.26 google.co.au
  • 91.224.160.26 google.ca
  • 91.224.160.26 google.us
  • 91.224.160.26 www.google.com
  • 91.224.160.26 www.google.co.uk
  • 91.224.160.26 www.google.com.au
  • 91.224.160.26 www.google.ca
  • 91.224.160.26 www.google.us