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Flag: Tornado! Hurricane!

Created: Monday, October 12 2009 19:16.01 CDT

Modified: Monday, October 12 2009 19:19.05 CDT

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Understanding WinXPSP2.Cermalus coded by Pluf

Author: Dreg

# Views: 5252

Hello people, here my explanation of the WinXPSP2.Cermalus malware, this malware have a ring0 component which hook:

   1. NtOpenFile: This routine infects the .exe, except the .exes inside windows directory. It checks if the .exe is already infected.

   2. NtEnumerateBootEntries: It returns STATUS_SUCCESS when the args are: "0xBEBE, 0xCAFE".

   3. NtDebugActiveProcess: It blocks the attach to ring3 process.

   4. DbgPrint/DbgPrintEx/DbgPrintReturnControlC: It blocks the debug using DbgPrint*

   5. PsSetCreateProcessNofityRoutine/PsSet//RemoveCreateThreadNotifyRoutine/: It returns STATUS_SUCCESS, but the hook is empty. It is useful to evade software monitors like ProcMon..

Dropper and ring3 component which load driver and other stuff, full explanation at:

http://biht.blogspot.com/2009/10/understanding-winxpsp2cermalus.html

you can download the src of virus here: http://66.98.184.55/%7Ebihtstor/vx/WinXPSP2.Cermalus/WinXPSP2.Cermalus.asm

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