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Virus:Worm/Autorun.aaer
Date discovered:07/07/2010
Type:Worm
In the wild:Yes
Reported Infections:Low to medium
Distribution Potential:Low to medium
Damage Potential:Low to medium
Static file:Yes
File size:757.317 Bytes
MD5 checksum:cea12765341e12c6b960c4470de391a2
IVDF version:7.10.09.33 - Wednesday, July 7, 2010

 General Methods of propagation:
   • Autorun feature
   • Messenger


Aliases:
   •  Mcafee: W32/Yahlover.worm.gen.d virus
   •  Sophos: W32/AutoRun-AOA
   •  Bitdefender: Trojan.AutoIt.AIL
   •  Panda: W32/Autorun.JKR
   •  Eset: Win32/Autoit.EB


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%\system3_.exe
   • %drive%\system3_.exe
   • %SYSDIR%\system3_.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 some files:

– The location is the following:
   • http://advgoogle.0catch.com/**********


– The locations are the following:
   • http://www.balu000.0catch.com/set/**********
   • http://www.balu001.0catch.com/set/**********
   • http://www.balu002.0catch.com/set/**********
   • http://www.balu005.0catch.com/set/**********
   • http://www.balu006.0catch.com/set/**********
   • http://www.balu007.0catch.com/set/**********
   • http://www.balu008.0catch.com/set/**********
   • http://www.balu009.0catch.com/set/**********
   • http://www.balu010.0catch.com/set/**********
   • http://www.balu011.0catch.com/set/**********


– The location is the following:
   • http://h1.ripway.com/asdb018/**********


– The location is the following:
   • http://h1.ripway.com/asdb020/**********


– The location is the following:
   • http://h1.ripway.com/asdb000/**********


– The location is the following:
   • http://h1.ripway.com/asdb004/**********


– The location is the following:
   • http://h1.ripway.com/asdb002/**********


– The location is the following:
   • http://h1.ripway.com/asdb016/**********


– The location is the following:
   • http://h1.ripway.com/asdb024/**********


– The location is the following:
   • http://h1.ripway.com/asdb006/**********


– The location is the following:
   • http://h1.ripway.com/asdb010/**********


– The location is the following:
   • http://h1.ripway.com/asdb012/**********


– The location is the following:
   • http://h1.ripway.com/asdb022/**********


– The location is the following:
   • http://h1.ripway.com/asdb014/**********




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%\system3_.exe


– Filename:
   • AT 09:00 /interactive /EVERY:m,t,w,th,f,s,su %SYSDIR%\system3_.exe

 Registry The following registry keys are added in order to run the processes after reboot:

– [HKLM\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon]
   • "Shell"="Explorer.exe system3_.exe"

– [HKCU\Software\Microsoft\Windows\CurrentVersion\Run]
   • "Yahoo Messengger"="%SYSDIR%\system3_.exe"



The following registry keys are added:

– [HKLM\SOFTWARE\Microsoft\Internet Explorer\MAIN]
   • "Default_Page_URL"="http://www.advgoogle.blogdpot.com"
   • "Default_Search_URL"="http://www.advgoogle.blogdpot.com"
   • "Search Page"="http://www.advgoogle.blogdpot.com"
   • "Start Page"="http://www.advgoogle.blogdpot.com"

– [HKCU\Software\Microsoft\Internet Explorer\Main]
   • "Start Page"="http://www.advgoogle.blogdpot.com"

 Messenger It is spreading via Messenger. The characteristics are described below:

– Yahoo Messenger

The URL then refers to a copy of the described malware. If the user downloads and executes this file the infection process will start again.

 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 Thursday, August 19, 2010
Description updated by Petre Galan on Thursday, August 19, 2010

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