➔
search
✕

BKDR_MATSNU.PL

September 30, 2014
 Modified by: RonJay Kristoffer Caragay
 ALIASES:

Trojan.Zbot (Symantec); Trojan-Ransom.Win32.Gimemo.bwsr (Kaspersky); TR/Matsnu.A.199 (Avira); Troj/Inject-BDY (Sophos); Trojan.Win32.Generic!BT (Sunbelt); Trojan horse Inject2.AWPT (AVG); Trojan-Spy.Zbot (Ikarus)

 PLATFORM:

Windows

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

  • Threat Type: Backdoor

  • Destructiveness: No

  • Encrypted:

  • In the wild: Yes

  OVERVIEW


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

It deletes itself after execution.

  TECHNICAL DETAILS

File Size:

73,520 bytes

File Type:

EXE

Memory Resident:

Yes

Initial Samples Received Date:

22 Sep 2014

Arrival Details

This backdoor 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 backdoor drops the following copies of itself into the affected system:

  • %Application Data%\{random foldername}\{random filename 1}.exe
  • %User Temp%\{random filename 2}.pre

(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.. %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.)

Autostart Technique

This backdoor 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 foldername}\{random filename 1}.exe"

Dropping Routine

This backdoor drops the following files:

  • %User Temp%\~{random}.tmp

(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.)

Other Details

This backdoor connects to the following possibly malicious URL:

  • http://{BLOCKED}ntmetal.com/backup.php
  • http://{BLOCKED}ntmetal.combackup.php
  • http://{BLOCKED}encouraging.com/backup.php
  • http://{BLOCKED}tbearintention.com/backup.php
  • http://{BLOCKED}racelanguage.com/backup.php
  • http://{BLOCKED}ardfield.com/backup.php
  • http://{BLOCKED}astbutton.com/backup.php
  • http://{BLOCKED}gearbuddy.com/backup.php
  • http://{BLOCKED}awscience.com/backup.php
  • http://{BLOCKED}creditchip.com/backup.php
  • http://{BLOCKED}onderhorse.com/backup.php
  • http://{BLOCKED}xaminecookie.com/backup.php
  • http://{BLOCKED}ollowteam.com/backup.php
  • http://{BLOCKED}erpossess.com/backup.php
  • http://{BLOCKED}ementtowel.com/backup.php
  • http://{BLOCKED}talkvalue.com/backup.php
  • http://{BLOCKED}osedpath.com/backup.php
  • http://{BLOCKED}kyreplacement.com/backup.php
  • http://{BLOCKED}oposedcommunicatio.com/backup.php
  • http://{BLOCKED}arketsuit.com/backup.php
  • http://{BLOCKED}rockperiod.com/backup.php
  • http://{BLOCKED}elaughcomputer.com/backup.php

It deletes itself after execution.

  SOLUTION

Minimum Scan Engine:

9.700

Step 1

Before doing any scans, Windows XP, Windows Vista, and Windows 7 users must disable System Restore to allow full scanning of their computers.

Step 2

Note that not all files, folders, and registry keys and entries are installed on your computer during this malware's/spyware's/grayware's execution. This may be due to incomplete installation or other operating system conditions. If you do not find the same files/folders/registry information, please proceed to the next step.

Step 3

Restart in Safe Mode

[ Learn More ]

Step 4

Delete this registry value

[ Learn More ]

Important: Editing the Windows Registry incorrectly can lead to irreversible system malfunction. Please do this step only if you know how or you can ask assistance from your system administrator. Else, check this Microsoft article first before modifying your computer's registry.

  • In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run
    • {random} = "%Application Data%\{random foldername}\{random filename 1}.exe"

Step 5

Restart in normal mode and scan your computer with your Trend Micro product for files detected as BKDR_MATSNU.PL. If the detected files have already been cleaned, deleted, or quarantined by your Trend Micro product, no further step is required. You may opt to simply delete the quarantined files. Please check this Knowledge Base page for more information.

Step 6

The following created files/folders/registry keys/registry entries cannot be identified by the user since there are no reference values in the created key. The only way it can be identified is by comparing the present system information with a backup. Note that the said components do not have to be deleted since it won't be harmful to the system.

 
  • %User Temp%\~{random}.tmp


Did this description help? Tell us how we did.