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Date discovered:15/10/2009
In the wild:Yes
Reported Infections:Low
Distribution Potential:Low to medium
Damage Potential:Low to medium
Static file:Yes
File size:171.024 Bytes
MD5 checksum:d6084176f7ef6ff28c544e7a9f8adb94
IVDF version:

 General Aliases:
   •  Mcafee: W32/Autorun.worm
   •  Panda: W32/Autorun.JPK
   •  Eset: Win32/AutoRun.Agent.TK
   •  Bitdefender: Worm.Generic.95428

Platforms / OS:
   • Windows 2000
   • Windows XP
   • Windows 2003

Side effects:
   • Downloads a malicious file
   • Drops malicious files
   • Registry modification

 Files It deletes the initially executed copy of itself.

It deletes the following file:
   • %SYSDIR%\RCX3.tmp

The following files are created:

%SYSDIR%\abfdcfedc.dll Further investigation pointed out that this file is malware, too. Detected as: TR/Dldr.Agent.wif.9


It tries to download a file:

– The location is the following:
At the time of writing this file was not online for further investigation.

 Registry To each registry key one of the values is added in order to run the processes after reboot:

–  [HKLM\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon]
   • "Blud"="%character string%"

–  [HKLM\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon\Notify\
   • "Asynchronous"=dword:0x00000001
   • "DllName"="%SYSDIR%\abfdcfedc.dll"
   • "Impersonate"=dword:0x00000000
   • "Lock"="lk"
   • "Logoff"="lk"
   • "Logon"="lk"
   • "Shutdown"="lk"
   • "StartScreenSaver"="lk"
   • "StartShell"="g"
   • "Startup"="lk"
   • "StopScreenSaver"="lk"
   • "Unlock"="lk"

 Injection – It injects itself as a thread into a process.

    Process name:
   • winlogon.exe

 File details Runtime packer:
In order to aggravate detection and reduce size of the file it is packed with a runtime packer.

Description inserted by Petre Galan on Friday, March 5, 2010
Description updated by Petre Galan on Friday, March 5, 2010

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