Full description

Virus:	TR/Ransom.WinLock.A
Date discovered:	19/07/2011
Type:	Trojan
In the wild:	No
Reported Infections:	Low
Distribution Potential:	Low
Damage Potential:	Low to medium
Static file:	Yes
File size:	33.792 Bytes
MD5 checksum:	B9CF011968971CDD8424BC463603B71D
VDF version:	7.11.11.206 - Tuesday, July 19, 2011
IVDF version:	7.11.11.206 - Tuesday, July 19, 2011

General Aliases:
   • TrendMicro: TROJ_RANSOM.AMM
   • Sophos: Mal/Zbot-DE
   • Microsoft: Trojan:Win32/Ransom.DF

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

Side effects:
   • Drops files
   • Registry modification

Right after execution the following information is displayed:

Files It copies itself to the following locations:
   • %ALLUSERSPROFILE%\Application Data\%hex values%.exe
   • %SYSDIR%\taskmgr.exe
   • %SYSDIR%\userinit.exe
   • %SYSDIR%\dllcache\taskmgr.exe
   • %SYSDIR%\dllcache\userinit.exe

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

– [HKLM\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon]
• "Shell"="%ALLUSERSPROFILE%\Application Data\%hex values%.exe"

Process termination The following process is terminated:
• %WINDIR%\explorer.exe

Miscellaneous Anti debugging
Checks for debugger or virtual machine using time related techniques.

File details Programming language:
The malware program was written in MS Visual C++.

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

Description inserted by Andrei Ilie on 7 Ekim 2011 Cuma
Description updated by Andrei Ilie on 10 Ekim 2011 Pazartesi

Geri . . . .

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