Sophos

W32/LegMir-AD

Aliases
  • Trojan.Win32.VB.kj
  • TROJ_LEGMIR.B
Category
Type
What to do
Prevalence low high

Summary

 
How it spreads
  • Network shares
Affected operating systems Windows
Characteristics
  • Drops more malware
  • Installs itself in the registry
Included in our products from June 2005 (3.94)
Protection available since 22 April 2005 13:02:31 (GMT)
Detected by All Sophos products

Action

More Information

W32/LegMir-AD is a network worm with password stealing functionality.

W32/LegMir-AD tries to copy itself to all logical drives connected to the computer as folder.exe.

W32/LegMir-AD steals password information and emails it to a preconfigured email address.

The worm may also create a keylogger DLL that is detected by Sophos as Troj/Legmir-E. W32/LegMir-AD is a network worm with password stealing functionality.

W32/LegMir-AD copies itself to:

\folder.exe
%WINDOWS%\~aTNr.exe
%WINDOWS%\cih.exe
%WINDOWS%\hh.exe
%WINDOWS%\intrenat.exe
%WINDOWS%\notepad.exe
%WINDOWS%\winhlp32.exe
%SYSTEM%\cih.exe
%SYSTEM%\lc_res.exe
%SYSTEM%\Winsocks.dll

The files notepad.exe and hh.exe are first copied to the files Note.dll and hh.dll respectively before they are overwritten with a copy of the worm.

W32/LegMir-AD tries to copy itself to all logical drives connected to the computer as folder.exe.

W32/LegMir-AD creates the following registry entries to ensure it is run at system logon:

HKLM\Software\Microsoft\Windows\CurrentVersion\Run
Intrenat
%WINDOWS%\intrenat.exe

HKLM\Software\Microsoft\Windows\CurrentVersion\RunServices
Intrenat
%WINDOWS%\intrenat.exe

W32/LegMir-AD creates the file AUTORUN.INF in the root folder which can be deleted.

W32/LegMir-AD steals password information and emails it to a preconfigured email address.

The worm may also create a keylogger DLL that is detected by Sophos as Troj/Legmir-E.

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