Full description

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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