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Virus:WORM/Autorun.LD.187
Date discovered:17/08/2011
Type:Worm
In the wild:No
Reported Infections:Low
Distribution Potential:Low to medium
Damage Potential:Low to medium
Static file:Yes
File size:126.976 Bytes
MD5 checksum:16F902491090535D69774895FDE63BF4
VDF version:7.11.13.117 - Wednesday, August 17, 2011
IVDF version:7.11.13.117 - Wednesday, August 17, 2011

 General Method of propagation:
    Autorun feature


Aliases:
   •  TrendMicro: Possible_Otorun8
   •  Sophos: Mal/SillyFDC-A
     Microsoft: Worm:Win32/Autorun.LD


Platforms / OS:
   • Windows 2000
   • Windows XP
   • Windows 2003
    Windows Vista
    Windows 7


Side effects:
   • Third party control
   • Drops files
   • Registry modification

 Files It copies itself to the following locations:
   • %SYSDIR%\SysSafe.exe
   • C:\info.exe

 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]
   • "Shell"="Explorer.exe C:\info.exe"

  [HKCU\Software\Microsoft\Windows\CurrentVersion\Run]
   • "B-A-I-D-U-C-O-M"="C:\info.exe"



The following registry keys are added in order to load the service after reboot:

[HKLM\SYSTEM\ControlSet001\Services\CryptSvc]
   • "Start"=dword:00000004



The following registry keys are added:

[HKLM\SOFTWARE\Microsoft\Windows NT\CurrentVersion\
   Image File Execution Options\avp.exe]
   • "Debugger"="C:\info.exe"

[HKLM\SOFTWARE\Microsoft\Windows NT\CurrentVersion\
   Image File Execution Options\taskmgr.exe]
   • "Debugger"="C:\info.exe"

[HKLM\SOFTWARE\Microsoft\Windows NT\CurrentVersion\
   Image File Execution Options\rfwmain.exe]
   • "Debugger"="C:\info.exe"



The following registry keys are changed:

Various Explorer settings:

[HKCU\Software\Microsoft\Windows\CurrentVersion\Explorer\Advanced]
   New value:
   • "Hidden"=dword:00000002

Internet Explorer's start page:

[HKCU\Software\Microsoft\Internet Explorer\Main]
   New value:
   • "Start Page"="http://www.baidu.com.cn/"

 Injection  It injects itself as a remote thread into processes.

    All of the following processes:
   • winlogon.exe
   • services.exe
   • userinit.exe
   • iexplore.exe
   • firefox.exe
   • msimn.exe
   • outlook.exe
   • explorer.exe
   • svchost.exe
   • rundll32.exe

   If successful, the malware process terminates while the injected part remains active.

 File details Programming language:
The malware program was written in MS Visual C++.


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

Description inserted by Andrei Ilie on Monday, October 10, 2011
Description updated by Andrei Ilie on Tuesday, October 11, 2011

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