Threat Descriptions

Trojan-Proxy:W32/Xorpix.AR

Classification

Category :

Malware

Type :

Trojan-Proxy

Platform :

W32

Aliases :

Trojan-Proxy:W32/Xorpix.AR

Summary

Trojan-Proxy:W32/Xorpix.AR injects its code to the process WINLOGON.EXE. It then opens Internet Explorer and acts as a proxy server.

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

Upon execution, the file detected as Trojan-Proxy.Win32.Xorpix.ar will drop DLL files with the following filenames:

  • bot.dll
  • dn.dll
  • partneship.dll

It will then create the following registry entries:

  • HKLM\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon\Notify\%dll_name%reg DllName "C:\Documents and Settings\All Users\Documents\Settings\%dll_name%.dll" Startup "%dll_name%reg" Impersonate dword:00000001 Asynchronous dword:00000001

Note: %dll_name% represents the filename of the dropped DLL.Here are the registry entries:

  • HKLM\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon\Notify\partnershipreg DllName "C:\Documents and Settings\All Users\Documents\Settings\partnership.dll" Startup "partnershipreg" Impersonate dword:00000001 Asynchronous dword:00000001
  • HKLM\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon\Notify\bnreg DllName "C:\Documents and Settings\All Users\Documents\Settings\bn.dll" Startup "bnreg" Impersonate dword:00000001 Asynchronous dword:00000001
  • HKLM\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon\Notify\botreg DllName "C:\Documents and Settings\All Users\Documents\Settings\bot.dll" Startup "botreg" Impersonate dword:00000001
  • Asynchronous dword:00000001

Xorpix.AR will then inject its code to the process Winlogon.exe. It then opens an instance of Internet Explorer and uses a random port to act as a proxy server.