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Virus:WORM/Autorun.DA
Date discovered:29/07/2010
Type:Worm
In the wild:Yes
Reported Infections:Low
Distribution Potential:Low to medium
Damage Potential:Low to medium
Static file:Yes
File size:253.605 Bytes
MD5 checksum:9bb5b5740470c8182969833c26254734
VDF version:7.10.04.73
IVDF version:7.10.10.16 - Thursday, July 29, 2010

 General Methods of propagation:
    Autorun feature
    Messenger


Aliases:
   •  Mcafee: W32/YahLover.worm!j
     Avast: AutoIt:AutoRun-B2
     AVG: Worm/Autoit.AFQX
   •  Panda: Trj/CI.A
   •  Eset: Win32/Autoit.DA


Platforms / OS:
   • Windows 2000
   • Windows XP
   • Windows 2003
    Windows Vista
    Windows Server 2008
    Windows 7


Side effects:
   • Drops a file
   • Lowers security settings
   • Registry modification
    Opens website in web browser

 Files It copies itself to the following locations:
   • %WINDIR%\smss.exe
   • %WINDIR%\killer.exe
   • %WINDIR%\ButuanCity Scandal.exe
   • %drive%\smss.exe
   • %drive%\ButuanCity Scandal.wmv.exe
   • %ALLUSERSPROFILE%\Start Menu\Programs\Startup\lsass.exe



The following file is created:

%WINDIR%\autorun.inf 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%

 Registry The following registry key is added in order to run the process after reboot:

[HKCU\Software\Microsoft\Windows\CurrentVersion\Run]
   • "Runonce"="%WINDIR%\smss.exe"



The following registry keys are changed:

Internet Explorer's start page:

[HKLM\SOFTWARE\Microsoft\Internet Explorer\Main]
   New value:
   • "Start Page"="http://www.Pornhub.com/"

[HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Explorer\Advanced\
   Folder\Hidden\SHOWALL]
   New value:
   • "CheckedValue"=dword:00000000

[HKLM\Software\Microsoft\Windows NT\CurrentVersion\Winlogon]
   New value:
   • "Shell"="explorer.exe, killer.exe"

[HKCR\.vbs]
   Old value:
   • "Default)"=""VBSFile"
   New value:
   • "(Default)"="exefile"

[HKCR\.reg]
   Old value:
   • "(Default)"="regfile"
   New value:
   • "(Default)"="exefile"

[HKCU\SOFTWARE\Microsoft\Internet Explorer\Main]
   New value:
   • "Start Page"="http://www.Pornhub.com/"
     "Window Title"="MABUHAY ANG TROJANz sikatttttttttttttttttt..HAHAH.Butuan City Phil.Nursing Student Scandal"

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

 Yahoo Messenger


To:
All entries in the contact list.

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.


Propagation via file
It sends a file with the following name:
   • %WINDIR%\ButuanCity Scandal.exe


The received message may look like the following:


Description inserted by Alexandru Dinu on Thursday, August 5, 2010
Description updated by Alexandru Dinu on Thursday, August 5, 2010

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