Full description

Virus:	Worm/AutoIt.AF
Date discovered:	16/07/2010
Type:	Worm
In the wild:	No
Reported Infections:	Low to medium
Distribution Potential:	Low to medium
Damage Potential:	Low to medium
Static file:	Yes
File size:	222.092 Bytes
MD5 checksum:	d84a73bdde2ef478a5efd90af5c857e3
VDF version:	7.10.04.21
IVDF version:	7.10.09.108 - Friday, July 16, 2010

General Methods of propagation:
   • Autorun feature
   • Messenger

Aliases:
   • F-Secure: Gen:Trojan.Heur.nmMfrzSTdNgib
   • Bitdefender: Gen:Trojan.Heur.nmMfrzSTdNgib
   • GData: Gen:Trojan.Heur.nmMfrzSTdNgib
   • DrWeb: Win32.HLLW.Texmer.51

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

Side effects:
   • Drops malicious files
   • Registry modification

Files It copies itself to the following locations:
   • %WINDIR%\SSVICHOSST.exe
   • %drive%\SSVICHOSST.exe
   • %SYSDIR%\SSVICHOSST.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 execute the following files:

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

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

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

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

The following registry keys are added:

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

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

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

– Yahoo Messenger

Message
The sent message looks like one of the following:

   • ang Web nay coi cung hay, vao coi thu di http://nhatquanglan1.0catch.com
     may, vao day coi co con nho nay ngon lam http://nhatquanglan1.0catch.com
     o day nghe bai nay di ban http://nhatquanglan1.0catch.com

Miscellaneous Accesses internet resources:
• http://nhatquanglan3.t3**********.com
• http://nhatquanglan4.t3**********.com

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

說明撰寫者 Wensin Lee 開啟 2012年4月16日星期一
說明更新者 Wensin Lee 開啟 2012年4月16日星期一

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