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Virus:Worm/Autorun.K
Date discovered:26/07/2007
Type:Worm
In the wild:Yes
Reported Infections:Low to medium
Distribution Potential:Low to medium
Damage Potential:Medium
Static file:Yes
File size:287.044 Bytes
MD5 checksum:8520bc26d1e51c6a0d7a475def6e69ef
IVDF version:6.39.00.189 - Thursday, July 26, 2007

 General Method of propagation:
• Autorun feature


Aliases:
   •  Mcafee: W32/YahLover.worm.gen virus
   •  Sophos: Mal/Sohana-A
   •  Panda: W32/Autorun.JCS
   •  Eset: Win32/AutoRun.Autoit.AF
   •  Bitdefender: Trojan.Autoit.SS


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%\hinhem.scr
   • %SYSDIR%\scvhost.exe
   • %WINDIR%\scvhost.exe
   • %SYSDIR%\blastclnnn.exe
   • %drive%\New Folder.exe
   • %drive%\svchost.exe



The following files are created:

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

%WINDIR%\Tasks\At1.job



It tries to download some files:

– The locations are the following:
   • http://setting3.9999mb.com/**********
   • http://setting3.yeahost.com/**********
At the time of writing this file was not online for further investigation.

– The location is the following:
   • http://www.freewebs.com/setting3/**********
At the time of writing this file was not online for further investigation.

– The location is the following:
   • http://www.webs.com/**********


– The locations are the following:
   • http://setting3.yeahost.com/**********
   • http://setting3.9999mb.com/**********
At the time of writing this file was not online for further investigation.

 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%\scvhost.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:

– [HKCU\Software\Microsoft\Windows\CurrentVersion\Internet Settings\
   Connections]
   New value:
   • "DefaultConnectionSettings"=hex:46,00,00,00,05,00,00,00,09,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,04,00,00,00,00,00,00,00,A0,1F,78,71,DE,74,CA,01,00,00,00,00,00,00,00,00,00,00,00,00,01,00,00,00,02,00,00,00,C0,A8,6B,64,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00

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

– [HKLM\SYSTEM\CurrentControlSet\Services\Schedule]
   New value:
   • "AtTaskMaxHours"=dword:0x00000000
   • "NextAtJobId"=dword:0x00000002

– [HKCU\Software\Microsoft\Windows\CurrentVersion\Policies\Explorer]
   New value:
   • "NofolderOptions"=dword:0x00000001

– [HKCU\Software\Microsoft\Windows\CurrentVersion\Internet Settings]
   New value:
   • "GlobalUserOffline"=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 Friday, December 4, 2009
Description updated by Petre Galan on Friday, December 4, 2009

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