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Virus:Worm/Autorun.hgs
Date discovered:04/01/2011
Type:Worm
In the wild:Yes
Reported Infections:Low to medium
Distribution Potential:Low to medium
Damage Potential:Low to medium
Static file:Yes
File size:282.624 Bytes
MD5 checksum:1366dea3925253b5a0dc0bd9d0df8fd9
VDF version:7.10.07.145
IVDF version:7.11.01.20 - Tuesday, January 4, 2011

 General Method of propagation:
    Autorun feature


Aliases:
   •  Mcafee: W32/Autorun.worm.c
   •  Kaspersky: Worm.Win32.AutoRun.hgs
   •  Sophos: W32/Autorun-BLJ
   •  Bitdefender: Trojan.VB.Agent.HI
   •  Panda: W32/P2Pworm.OJ
     GData: Trojan.VB.Agent.HI


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


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

 Files It copies itself to the following locations:
   • %drive%\tyol.exe
   • %HOME%\Application Data\tyol.exe



The following files are created:

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

%HOME%\Application Data\rkxkxw.exe Further investigation pointed out that this file is malware, too. Detected as: TR/Dropper.Gen




It tries to download a file:

The location is the following:
   • http://smi-download.co.uk/**********
It is saved on the local hard drive under: %TEMPDIR%\97784.exe Further investigation pointed out that this file is malware, too. Detected as: TR/Dropper.Gen




It tries to execute the following file:

Filename:
   • %TEMPDIR%\97784.exe

 Registry The following registry keys are added in order to run the processes after reboot:

[HKLM\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon]
   • "Taskman"="%HOME%\Application Data\rkxkxw.exe"

[HKCU\Software\Microsoft\Windows NT\CurrentVersion\Winlogon]
   • "Shell"="%HOME%\Application Data\tyol.exe,explorer.exe,%HOME%\Application Data\rkxkxw.exe"

 Backdoor Contact server:
All of the following:
   • ms.tvc**********.com:1291 (UDP)
   • cha**********.com:1291 (UDP)
   • ms.tvc**********.com:1980 (UDP)


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

    Process name:
   • explorer.exe


 Miscellaneous Mutex:
It creates the following Mutexes:
   • t"}D+21
   • y/:H+21

 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 Thursday, March 31, 2011
Description updated by Petre Galan on Thursday, March 31, 2011

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