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Date discovered:28/07/2010
In the wild:Yes
Reported Infections:Low to medium
Distribution Potential:Low to medium
Damage Potential:Low to medium
Static file:Yes
File size:911.108 Bytes
MD5 checksum:b2e80a6c30cf5ca7a61d2321bf6451a9
VDF version:
IVDF version:

 General Method of propagation:
   • Autorun feature

   •  Mcafee: W32/Autorun.worm.zf.gen
   •  Sophos: W32/Autorun-BKY
   •  Bitdefender: Backdoor.Generic.392583
   •  Panda: W32/Harakit.EP
   •  Eset: Win32/AutoRun.Autoit.DK

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

Side effects:
   • Drops malicious files
   • Lowers security settings
   • Registry modification

 Files It copies itself to the following locations:
   • %SYSDIR%\csrcs.exe
   • %drive%\wodxaz.exe

It deletes the initially executed copy of itself.

It deletes the following files:
   • %TEMPDIR%\qxstvry
   • %TEMPDIR%\aut%number%.tmp
   • %TEMPDIR%\~ip.tmp
   • %TEMPDIR%\ogksxbo

The following files are created:

%drive%\autorun.inf This is a non malicious text file with the following content:
   • %code that runs malware%

%SYSDIR%\autorun.inf This is a non malicious text file with the following content:
   • %code that runs malware%


It tries to execute the following files:

– Filename:
   • %SYSDIR%\csrcs.exe

– Filename:
   • net view %IP address%

– Filename:
   • cmd /c %TEMPDIR%\suicide.bat

– Filename:
   • ping -n 5 -w 250

 Registry The following registry key is added in order to run the process after reboot:

– [HKLM\Software\Microsoft\Windows\CurrentVersion\policies\Explorer\
   • "csrcs"="%SYSDIR%\csrcs.exe"

The following registry key is added:

– [HKLM\Software\Microsoft\DRM\amty]
   • "dreg"="408406541BC5BBE4DC197A2A0C46B9ACF2F90D96B151D7C7BCBD177641EE95F562E634D70EB70FB65FC8FBF0EC31261C8626D05B1ED70CC881A48DA07A7E1A9A"
   • "exp1"="408406541BC5BBE4DC197A2A0C46B9ABF2F90D96B151D7C7BCBD177641EE958D"
   • "fix"=""
   • "fix1"="1"
   • "ilop"="1"
   • "regexp"="-0.918282786212119"

The following registry keys are changed:

– [HKLM\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon]
   New value:
   • "Shell"="Explorer.exe csrcs.exe"

– [HKCU\Software\Microsoft\Windows\CurrentVersion\Explorer\Advanced]
   New value:
   • "Hidden"=dword:0x00000002
   • "ShowSuperHidden"=dword:0x00000000
   • "SuperHidden"=dword:0x00000000

– [HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Explorer\Advanced\
   New value:
   • "CheckedValue"=dword:0x00000001

 P2P In order to infect other systems in the Peer to Peer network community the following action is performed:   It retrieves shared folders by querying the following registry keys:
   • HKCU\Software\Kazaa\LocalContent
   • HKCU\Software\Shareaza\Shareaza\Downloads
   • HKCU\Software\Ares
   • HKCU\Software\eMule

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

    Process name:
   • net.exe

 Miscellaneous  Checks for an internet connection by contacting the following web sites:
   • string%&rnd2=%character string%
Accesses internet resources:

It creates the following Mutex:
   • 6E523163793968624

 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 Tuesday, February 22, 2011
Description updated by Petre Galan on Tuesday, February 22, 2011

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