W32/Sohanad.R - Malware

See also

Summary

Full description

Statistics

Virus:	W32/Sohanad.R
Date discovered:	19/07/2007
Type:	Worm
In the wild:	Yes
Reported Infections:	Low to medium
Distribution Potential:	Low
Damage Potential:	Low to medium
Static file:	No
File size:	240.128 Bytes
IVDF version:	6.39.00.168 - Thu, 19 Jul 2007 18:52 (GMT+1)

General Method of propagation:
   • No own spreading routine

Aliases:
   • Symantec: W32.Svich
   • Mcafee: W32/YahLover.worm virus
   • Kaspersky: Trojan-Downloader.Win32.AutoIt.aa
   • F-Secure: Trojan-Downloader.Win32.AutoIt.aa
   • Sophos: W32/Sohana-R
   • Panda: W32/Sohanat.BP.worm
   • VirusBuster: Trojan.DL.AutoIt.DO
   • Eset: Win32/Sohanad.NAK worm
   • Bitdefender: Worm.IM.Agent.G

Platforms / OS:
   • Windows 95
   • Windows 98
   • Windows 98 SE
   • Windows NT
   • Windows ME
   • Windows 2000
   • Windows XP
   • Windows 2003

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

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

– %SYSDIR%\autorun.ini Further investigation pointed out that this file is malware, too. Detected as: INF/AutoRun.J

It tries to download some files:

– The location is the following:
   • http://nhatquanglan3.t35.com/**********.nql
It is saved on the local hard drive under: %temporary internet files%\Content.IE5\%random character string%\setting[1].nql At the time of writing this file was not online for further investigation.

– The location is the following:
   • http://nhatquanglan4.t35.com/**********.nql
It is saved on the local hard drive under: %temporary internet files%\Content.IE5\%random character string%\setting[1].nql

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

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

– [HKLM\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon]
   • "Shell"="Explorer.exe SSVICHOSST.exe"

The following registry keys are added:

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

– [HKCU\Software\Microsoft\Windows\CurrentVersion\Policies\Explorer]
   • "NofolderOptions"=dword:00000001

The following registry keys are changed:

Disable Regedit and Task Manager:
– [HKCU\Software\Microsoft\Windows\CurrentVersion\Policies\System]
   New value:
   • "DisableTaskMgr"=dword:00000001
   • "DisableRegistryTools"=dword:00000001

– [HKLM\SYSTEM\ControlSet001\Services\Schedule]
   New value:
   • "AtTaskMaxHours"=dword:00000000

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 the following runtime packer:
• UPX

See a brief description here.

Description inserted by Andreas Feuerstein on Tue, 09 Sep 2008 14:24 (GMT+1)
Description updated by Andreas Feuerstein on Tue, 09 Sep 2008 15:30 (GMT+1)

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