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Virus:Worm/Sohanad.CA
Date discovered:30/04/2009
Type:Worm
In the wild:Yes
Reported Infections:Low
Distribution Potential:Low to medium
Damage Potential:Low to medium
Static file:Yes
File size:428.662 Bytes
MD5 checksum:b739e33d823032bd5118bdbe7dddd14a
IVDF version:7.01.03.139 - Thursday, April 30, 2009

 General Method of propagation:
    Autorun feature


Aliases:
   •  Mcafee: W32/YahLover.worm
   •  Sophos: Mal/Sohana-A
   •  Panda: W32/Sohanat.DZ
   •  Eset: Win32/Sohanad.AS
   •  Bitdefender: Win32.YahLover.SJ


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:
   • %WINDIR%\SCVVHSOT.exe
   • %SYSDIR%\SCVVHSOT.exe
   • %SYSDIR%\blastclnnn.exe
   • %drive%\SCVVHSOT.exe



The following file is created:

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




It tries to download some files:

The locations are the following:
   • http://setting3.9999mb.com/**********
   • http://setting3.yeahost.com/**********


The location is the following:
   • http://www.freewebs.com/setting3/**********


The locations are the following:
   • http://setting3.yeahost.com/**********
   • http://setting3.9999mb.com/**********


The location is the following:
   • http://www.freewebs.com/setting3/**********




It tries to executes the following files:

Filename:
   • %SYSDIR%\cmd.exe /C AT /delete /yes


Filename:
   • AT /delete /yes


Filename:
   • %SYSDIR%\cmd.exe /C AT 09:00 /interactive /EVERY:m,t,w,th,f,s,su %SYSDIR%\blastclnnn.exe


Filename:
   • AT 09:00 /interactive /EVERY:m,t,w,th,f,s,su %SYSDIR%\blastclnnn.exe

 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%\SCVVHSOT.exe"



The following registry keys are added:

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

[HKCU\Software\Microsoft\Windows\CurrentVersion\Explorer\
   WorkgroupCrawler\Shares]
   • "shared"="\New Folder.exe"



The following registry keys are changed:

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

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

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

 Process termination The following process is terminated:
   • taskmgr.exe


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

說明撰寫者 Petre Galan 開啟 2010年4月1日星期四
說明更新者 Petre Galan 開啟 2010年4月1日星期四

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