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TROJ_RANSOM.LKK

May 25, 2013
 Analysis by: Jaime Benigno Reyes
 ALIASES:

Trojan:Win32/Lyposit.C (Microsoft), Ransom-FBWJ!34B78AD285FD (McAfee)

 PLATFORM:

Windows 2000, Windows Server 2003, Windows XP (32-bit, 64-bit), Windows Vista (32-bit, 64-bit), Windows 7 (32-bit, 64-bit)

 OVERALL RISK RATING:
 DAMAGE POTENTIAL:
 DISTRIBUTION POTENTIAL:
 REPORTED INFECTION:

  • Threat Type: Trojan

  • Destructiveness: No

  • Encrypted:

  • In the wild: Yes

  OVERVIEW


This Trojan arrives on a system as a file dropped by other malware or as a file downloaded unknowingly by users when visiting malicious sites.

It requires its main component to successfully perform its intended routine.

  TECHNICAL DETAILS

File Size:

55,808 bytes

File Type:

DLL

Memory Resident:

Yes

Initial Samples Received Date:

25 May 2013

Arrival Details

This Trojan arrives on a system as a file dropped by other malware or as a file downloaded unknowingly by users when visiting malicious sites.

Installation

This Trojan drops the following files:

  • %User Temp%\4.tmp\1.jpg
  • %User Temp%\4.tmp\2.jpg
  • %User Temp%\4.tmp\3.jpg
  • %User Temp%\4.tmp\error.png
  • %User Temp%\4.tmp\flag.jpg
  • %User Temp%\4.tmp\head.jpg
  • %User Temp%\4.tmp\main.htm
  • %User Temp%\4.tmp\notice.png
  • %User Temp%\4.tmp\sil.jpg
  • %User Temp%\4.tmp\u.jpg
  • %User Temp%\4.tmp\US.jpg
  • %User Temp%\4.tmp\win.jpg

(Note: %User Temp% is the current user's Temp folder, which is usually C:\Documents and Settings\{user name}\Local Settings\Temp on Windows 2000, XP, and Server 2003, or C:\Users\{user name}\AppData\Local\Temp on Windows Vista and 7.)

It creates the following folders:

  • User Temp%\4.tmp

Other Details

This Trojan connects to the following possibly malicious URL:

  • http://{BLOCKED}38pwr2xrkw4.org
  • http://{BLOCKED}4bm2woz57a.org
  • http://{BLOCKED}obsj.com
  • http://{BLOCKED}fj7nfp.com
  • http://{BLOCKED}65.com

It requires its main component to successfully perform its intended routine.