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Date discovered:13/06/2008
In the wild:No
Reported Infections:Low
Distribution Potential:Low
Damage Potential:Low to medium
Static file:No
File size:~617.000 Bytes
IVDF version:

 General Method of propagation:
   • No own spreading routine

   •  Symantec: W32.Imaut
   •  Mcafee: W32/YahLover.worm virus
   •  Kaspersky:
   •  TrendMicro: WORM_DELF.FEA
   •  F-Secure:
   •  Sophos: Mal/Airworm-A
   •  Eset: Win32/Autoit.DB worm

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

Side effects:
   • Drops a file
   • Registry modification

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

The following file is created:

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

 Registry The following registry key 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]
   • "DisableTaskMgr"=dword:00000000
   • "DisableRegistryTools"=dword:00000001

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

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

The following registry keys are changed:

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

Various Explorer settings:
– [HKCU\Software\Microsoft\Windows\CurrentVersion\Policies\Explorer]
   New value:
   • "NofolderOptions"=dword:00000000

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

Description inserted by Thomas Wegele on Tuesday, July 29, 2008
Description updated by Thomas Wegele on Tuesday, July 29, 2008

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