Virus:Worm/Sohaned.BP
Date discovered:07/11/2008
Type:Worm
In the wild:Yes
Reported Infections:Low
Distribution Potential:Low to medium
Damage Potential:Low to medium
Static file:Yes
File size:327.109 Bytes
MD5 checksum:8c4c10bc0cd60742a57eb6a4e6f3c261
IVDF version:7.01.00.55 - Friday, November 7, 2008

 General Method of propagation:
   • Autorun feature


Aliases:
   •  Mcafee: W32/YahLover.worm.gen
   •  Panda: W32/Autorun.JHJ
   •  Eset: Win32/Autoit.EB
   •  Bitdefender: Worm.Generic.39680


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


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

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



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.ini Further investigation pointed out that this file is malware, too. Detected as: Worm/AutoIt.AV




It tries to download some files:

– The location is the following:
   • http://rnd009.googlepages.com/**********
At the time of writing this file was not online for further investigation.

– The location is the following:
   • http://rnd009.googlepages.com/**********
At the time of writing this file was not online for further investigation.

 Registry One of the following values is added in order to run the process after reboot:

–  [HKCU\Software\Microsoft\Windows\CurrentVersion\Run]
   • "Yahoo Messengger"="%SYSDIR%\gphone.exe"



The following registry key is added:

– [HKCU\Software\Microsoft\Windows\CurrentVersion\Policies\System]
   • "DisableRegistryTools"=dword:0x00000001
   • "DisableTaskMgr"=dword:0x00000001



The following registry keys are changed:

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

– [HKLM\SYSTEM\CurrentControlSet\Services\Schedule]
   New value:
   • "AtTaskMaxHours"=dword:0x00000000

– [HKCU\Software\Microsoft\Internet Explorer\Main]
   New value:
   • "Start Page"="http://rnd009.googlepages.com/google.html"

– [HKCU\Software\Microsoft\Windows\CurrentVersion\Policies\Explorer]
   New value:
   • "NofolderOptions"=dword:0x00000001

– [HKLM\SOFTWARE\Microsoft\Internet Explorer\Main]
   New value:
   • "Default_Page_URL"="http://rnd009.googlepages.com/google.html"
   • "Default_Search_URL"="http://rnd009.googlepages.com/google.html"
   • "Search Page"="http://rnd009.googlepages.com/google.html"
   • "Start Page"="http://rnd009.googlepages.com/google.html"

 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 11, 2010
Description updated by Petre Galan on Thursday, March 11, 2010

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