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Virus:DR/Autoit.RU.6
Date discovered:01/02/2010
Type:Dropper
In the wild:Yes
Reported Infections:Low to medium
Distribution Potential:Low to medium
Damage Potential:Low to medium
Static file:Yes
File size:823.665 Bytes
MD5 checksum:1dbefef6c17f82a4a4c90d7ea9476a6f
IVDF version:7.10.03.141 - Monday, February 1, 2010

 General Method of propagation:
    Autorun feature


Aliases:
   •  Mcafee: W32/YahLover.worm
   •  Sophos: Mal/Generic-A
   •  Panda: W32/Autorun.JVM
   •  Eset: Win32/Sohanad.NFJ
   •  Bitdefender: Win32.Worm.Yahlover.N


Platforms / OS:
   • Windows 2000
   • Windows XP
   • Windows 2003


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

 Files It copies itself to the following locations:
   • %SYSDIR%\SICHOST.exe
   • %drive%\%all directories%\%folder name%.exe
   • %WINDIR%\SICHOST.exe
   • %drive%\SICHOST.exe
   • %drive%\New Folder.exe



The following files are created:

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




It tries to download a file:

The location is the following:
   • http://lotusspring3.t35.com/**********




It tries to executes the following files:

Filename:
   • %SYSDIR%\cmd.exe /C AT /delete /yes


Filename:
   • AT /delete /yes


Filename:
   • %SYSDIR%\cmd.exe /C AT 09:00 /interactive /EVERY:m,t,w,th,f,s,su %SYSDIR%\SICHOST.exe


Filename:
   • AT 09:00 /interactive /EVERY:m,t,w,th,f,s,su %SYSDIR%\SICHOST.exe

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

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



The following registry key is added:



The following registry keys are changed:

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

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

[HKCU\Software\Microsoft\Internet Explorer\Main]
   New value:
   • "Start Page"="http://www.blackcheta.blogspot.com/"

[HKLM\SOFTWARE\Microsoft\Internet Explorer\Main]
   New value:
   • "Default_Page_URL"="http://www.blackcheta.blogspot.com/"
   • "Default_Search_URL"="http://www.blackcheta.blogspot.com/"
   • "Search Page"="http://www.blackcheta.blogspot.com/"
   • "Start Page"="http://www.blackcheta.blogspot.com/"

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

Descrição enviada por Petre Galan em quarta-feira, 7 de abril de 2010
Descrição atualizada por Andrei Ivanes em quinta-feira, 8 de abril de 2010

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