Trojan:BASH/QHost.WB

Classification

Malware

Trojan

BASH

Trojan:BASH/QHost.WB, Trojan:BASH/QHost.WB, BASH/QHost.WB, QHost, QHost.WB

Summary

Trojan:BASH/QHost.WB hijacks web traffic by modifying the hosts file.

Removal

Manually correcting the hosts file

  • 1. Open terminal and change directory to */private/etc/*
    • $cd /private/etc
  • 2. Use any editor tool you prefer and edit the *hosts* file. Note: You need root privilege to do this.
    • $sudo vim hosts
  • You should see something similar to the following:
    • 91.224.160.26 google.com
    • 91.224.160.26 google.ae
    • 91.224.160.26 google.as[truncated for brevity]
  • 3. Remove all the entries contain *91.224.160.26* from the hosts file.

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

Knowledge Base

Find the latest advice in our Community Knowledge Base.

User Guide

See the user guide for your product on the Help Center.

Contact Support

Chat with or call an expert for help.

Submit a sample

Submit a file or URL for further analysis.

Technical Details

Trojan:BASH/QHost.WB poses as a FlashPlayer installer called FlashPlayer.pkg:

Screenshot of Trojan:BASH/QHost.WB masquerading as a FlashPlayer

This trojan is also further discussed in our Labs Weblog post:

Activity

Upon installation, the trojan will hijack and redirect web traffic to Google by adding the following entries to the hosts file:

  • 91.224.160.26 google.com
  • 91.224.160.26 google.ae
  • 91.224.160.26 google.as
  • 91.224.160.26 google.at
  • 91.224.160.26 google.az
  • 91.224.160.26 google.ba
  • 91.224.160.26 google.be
  • 91.224.160.26 google.bg
  • 91.224.160.26 google.bs
  • 91.224.160.26 google.ca
  • 91.224.160.26 google.cd
  • 91.224.160.26 google.com.gh
  • 91.224.160.26 google.com.hk
  • 91.224.160.26 google.com.jm
  • 91.224.160.26 google.com.mx
  • 91.224.160.26 google.com.my
  • 91.224.160.26 google.com.na
  • 91.224.160.26 google.com.nf
  • 91.224.160.26 google.com.ng
  • 91.224.160.26 google.ch
  • 91.224.160.26 google.com.np
  • 91.224.160.26 google.com.pr
  • 91.224.160.26 google.com.qa
  • 91.224.160.26 google.com.sg
  • 91.224.160.26 google.com.tj
  • 91.224.160.26 google.com.tw
  • 91.224.160.26 google.dj
  • 91.224.160.26 google.de
  • 91.224.160.26 google.dk
  • 91.224.160.26 google.dm
  • 91.224.160.26 google.ee
  • 91.224.160.26 google.fi
  • 91.224.160.26 google.fm
  • 91.224.160.26 google.fr
  • 91.224.160.26 google.ge
  • 91.224.160.26 google.gg
  • 91.224.160.26 google.gm
  • 91.224.160.26 google.gr
  • 91.224.160.26 google.ht
  • 91.224.160.26 google.ie
  • 91.224.160.26 google.im
  • 91.224.160.26 google.in
  • 91.224.160.26 google.it
  • 91.224.160.26 google.ki
  • 91.224.160.26 google.la
  • 91.224.160.26 google.li
  • 91.224.160.26 google.lv
  • 91.224.160.26 google.ma
  • 91.224.160.26 google.ms
  • 91.224.160.26 google.mu
  • 91.224.160.26 google.mw
  • 91.224.160.26 google.nl
  • 91.224.160.26 google.no
  • 91.224.160.26 google.nr
  • 91.224.160.26 google.nu
  • 91.224.160.26 google.pl
  • 91.224.160.26 google.pn
  • 91.224.160.26 google.pt
  • 91.224.160.26 google.ro
  • 91.224.160.26 google.ru
  • 91.224.160.26 google.rw
  • 91.224.160.26 google.sc
  • 91.224.160.26 google.se
  • 91.224.160.26 google.sh
  • 91.224.160.26 google.si
  • 91.224.160.26 google.sm
  • 91.224.160.26 google.sn
  • 91.224.160.26 google.st
  • 91.224.160.26 google.tl
  • 91.224.160.26 google.tm
  • 91.224.160.26 google.tt
  • 91.224.160.26 google.us
  • 91.224.160.26 google.vu
  • 91.224.160.26 google.ws
  • 91.224.160.26 google.co.ck
  • 91.224.160.26 google.co.id
  • 91.224.160.26 google.co.il
  • 91.224.160.26 google.co.in
  • 91.224.160.26 google.co.jp
  • 91.224.160.26 google.co.kr
  • 91.224.160.26 google.co.ls
  • 91.224.160.26 google.co.ma
  • 91.224.160.26 google.co.nz
  • 91.224.160.26 google.co.tz
  • 91.224.160.26 google.co.ug
  • 91.224.160.26 google.co.uk
  • 91.224.160.26 google.co.za
  • 91.224.160.26 google.co.zm
  • 91.224.160.26 google.com
  • 91.224.160.26 google.com.af