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Virus:Worm/AutoIt.x.5
Date discovered:25/11/2009
Type:Worm
In the wild:Yes
Reported Infections:Low
Distribution Potential:Low to medium
Damage Potential:Medium
Static file:Yes
File size:1.132.544 Bytes
MD5 checksum:f6919554ca3bde8b0ce1e81987e266aa
IVDF version:7.10.01.77 - Wednesday, November 25, 2009

 General Method of propagation:
   • Autorun feature


Aliases:
   •  Mcafee: W32/Autorun.worm.f
   •  Sophos: Mal/Sohana-B
   •  Panda: W32/Sohanat.IZ
   •  Eset: Win32/Autoit.AG
   •  Bitdefender: Win32.Worm.AutoIt.AC


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%\regsvr.exe
   • %SYSDIR%\svchost .exe
   • %SYSDIR%\regsvr.exe
   • %drive%\regsvr.exe
   • %drive%\%all directories%\%folder name% .exe



The following files are created:

%WINDIR%\Tasks\At1.job This is a non malicious text file with the following content:
   • %code that runs malware%

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

%SYSDIR%\setup.ini



It tries to download some files:

– The locations are the following:
   • http://yahoo.com/**********.xls
   • http://www.yahoo.com/**********.xls


– The locations are the following:
   • http://www.yahoo.com/**********.doc
   • http://yahoo.com/**********.doc

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

–  [HKCU\Software\Microsoft\Windows\CurrentVersion\Run]
   • "Msn Messsenger"="%SYSDIR%\regsvr.exe"



The following registry keys are added:

– [HKCU\Software\Microsoft\Windows\CurrentVersion\Policies\System]
   • "DisableRegistryTools"=dword:0x00000001
   • "DisableTaskMgr"=dword:0x00000000

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



The following registry keys are changed:

– [HKLM\SYSTEM\CurrentControlSet\Hardware Profiles\0001\Software\
   Microsoft\windows\CurrentVersion\Internet Settings]
   New value:
   • "ProxyEnable"=dword:0x00000000

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

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

– [HKCU\Software\Microsoft\Windows\CurrentVersion\Policies\Explorer]
   New value:
   • "NofolderOptions"=dword:0x00000000

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

Die Beschreibung wurde erstellt von Petre Galan am Montag, 15. März 2010
Die Beschreibung wurde geändert von Petre Galan am Montag, 15. März 2010

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