Sophos

Troj/WLHack-C

Aliases
  • Trojan.Win32.Patched.q
  • Win32/Agent.NHJ
Category
Type
What to do
Prevalence low high

Summary

 
Affected operating systems Windows
Protection available since 7 May 2007 16:24:29 (GMT)
Detected by All Sophos products
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Action

Please follow the instructions for removing Trojans.

After winlogon.exe has been disinfected a system reboot is recommended to complete the cleanup process.

More Information

Troj/WLHack-C is a Trojan for the Windows platform.

Troj/WLHack-C is a hacked version of <System>\winlogon.exe which is a legitimate Windows system file.

When executed on startup as a replacement to the original winlogon.exe Troj/WLHack-C attempts to load malicious code from mstscex.dll.

On NTFS systems the DLL may reside in an Alternate Data Stream within the <System> folder.

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