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