Trojan:W32/Qhost.IT

Classification

Malware

Trojan

W32

Trojan:W32/Qhost.IT, Trojan:W32/Qhost.IT

Summary

Trojan:W32/Qhost.IT stops antivirus products from updating by modifying the %windir%\system32\drivers\etc\HOSTS file.

Removal

Automatic action

Based on the settings of your F-Secure security product, it will either move the file to the quarantine where it cannot spread or cause harm, or remove it.

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

This trojan modifies the HOSTS file to prevent access to antivirus related sites and services.It Creates the following file:

  • %windir%\system32\iklvb.dll - Trojan.Win32.Qhost.it

It creates the following registry keys as its autostart-mechanism:

  • HKLM\SOFTWARE\Classes\CLSID\{2C1CD3D7-86AC-4068-93BC-A02304B60787}
  • HKLM\SOFTWARE\Classes\CLSID\{2C1CD3D7-86AC-4068-93BC-A02304B60787}\InProcServer32 (default) = C:\WINDOWS\system32\iklvb.dll
  • HKLM\SOFTWARE\Classes\CLSID\{2C1CD3D7-86AC-4068-93BC-A02304B60787}\InProcServer32 ThreadingModel = Apartment
  • HKLM\Software\Microsoft\Windows\CurrentVersion\Explorer\SharedTaskScheduler {2C1CD3D7-86AC-4068-93BC-A02304B60787} = DCOM Server 60787
  • HKLM\Software\Microsoft\Windows\CurrentVersion\ShellServiceObjectDelayLoad DCOM Server 60787 = {2C1CD3D7-86AC-4068-93BC-A02304B60787}

It modifies the HOSTS file to prevent antivirus products from receiving updates. It points the update site to localhost. Access to the following sites is blocked:

  • avp.com
  • ca.com
  • customer.symantec.com
  • dispatch.mcafee.com
  • download.mcafee.com
  • downloads1.kaspersky-labs.com
  • downloads2.kaspersky-labs.com
  • downloads3.kaspersky-labs.com
  • downloads4.kaspersky-labs.com
  • liveupdate.symantec.com
  • liveupdate.symantecliveupdate.com
  • mast.mcafee.com
  • networkassociates.com
  • rads.mcafee.com
  • secure.nai.com
  • securityresponse.symantec.com
  • sophos.com
  • updates.symantec.com
  • us.mcafee.com
  • viruslist.com
  • www.avp.com
  • www.ca.com
  • www.f-secure.com
  • www.kaspersky.com
  • www.mcafee.com
  • www.my-etrust.com
  • www.nai.com
  • www.networkassociates.com
  • www.sophos.com
  • www.symantec.com
  • www.trendmicro.com
  • www.viruslist.com