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Virus:DR/Autoit.X.28
Type:Trojan
In the wild:Yes
Reported Infections:Low
Distribution Potential:Low to medium
Damage Potential:Low to medium
Static file:Yes
File size:2.039.569 Bytes
MD5 checksum:f88648076d23fb08c04b5c1ec94f3965

 General Method of propagation:
   • Autorun feature


Aliases:
   •  Mcafee: W32/Autorun.worm.f
   •  Sophos: Mal/Generic-A
   •  Panda: W32/Hakaglan.B.worm
   •  Eset: Win32/Sohanad.NFE
   •  Bitdefender: Worm.Autoit.B


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 key is added:

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



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.

Description inserted by Petre Galan on Monday, March 15, 2010
Description updated by Petre Galan on Monday, March 15, 2010

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