Analysis by: Jaime Benigno Reyes
ALIASES:

Trojan:Win32/Matsnu.gen!A (Microsoft), Trojan.Win32.Inject.fexk (Kaspersky), Trojan.Ransomlock.P (Symantec)

 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: Spyware

  • Destructiveness: No

  • Encrypted:

  • In the wild: Yes

  OVERVIEW

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

  TECHNICAL DETAILS

File Size: 36,729 bytes
File Type: COM, EXE
Memory Resident: Yes
Initial Samples Received Date: 07 Mar 2013

Arrival Details

This spyware 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 spyware drops the following files:

  • %User Temp%\{random}.pre

(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 drops the following copies of itself into the affected system:

  • %Application Data%\{random}\{random}.exe
  • %User Profile%%User Profile%\{random}\{random}.exe

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

It creates the following folders:

  • %Application Data%\{random}
  • %User Profile%%User Profile%\{random}

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

Autostart Technique

This spyware adds the following registry entries to enable its automatic execution at every system startup:

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Run
{random} = "%Application Data%\{random}\{random}.exe"

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Run
{random} = "%User Profile%%User Profile%\{random}\{random}.exe"

Other System Modifications

This spyware adds the following registry entries:

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Internet Settings
GlobalUserOffline = "0"

It modifies the following registry entries:

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Internet Settings\
Zones\3
1609 = "0"

(Note: The default value data of the said registry entry is "1".)

Other Details

This spyware connects to the following possibly malicious URL:

  • http://{BLOCKED}gt.com
  • http://{BLOCKED}w-plozuj.com
  • http://{BLOCKED}ect-proxy.com
  • http://{BLOCKED}lines.com
  • http://{BLOCKED}nline.com
  • http://{BLOCKED}roxy24.com
  • http://{BLOCKED}olderxx.com
  • http://{BLOCKED}bspace-apo.com
  • http://{BLOCKED}sxu.com
  • http://{BLOCKED}aw.com
  • http://{BLOCKED}rz.com
  • http://{BLOCKED}ppf.com
  • http://{BLOCKED}ieg.com
  • http://{BLOCKED}kiu.com
  • http://{BLOCKED}ops.com
  • http://{BLOCKED}sje.com
  • http://{BLOCKED}sxf.com
  • http://{BLOCKED}vsje.com
  • http://{BLOCKED}nlinednsmy.com
  • http://{BLOCKED}k.com
  • http://{BLOCKED}d.com
  • http://{BLOCKED}y.ru
  • http://{BLOCKED}eu.ru
  • http://{BLOCKED}t.ru
  • http://{BLOCKED}kers.ru