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BKDR_LIFTOH.QMUU

September 07, 2013
 Analysis by: Rika Joi Gregorio
 ALIASES:

Trojan:Win32/Alureon.GC(Microsoft), Trojan.Win32.Yakes(Ikarus), Win32/Dorkbot.B worm(Eset)

 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: Backdoor

  • Destructiveness: No

  • Encrypted: Yes

  • In the wild: Yes

  OVERVIEW

Infection Channel:

Downloaded from the Internet, Dropped by other malware


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 executes commands from a remote malicious user, effectively compromising the affected system. It connects to a website to send and receive information.

  TECHNICAL DETAILS

File Size:

87,040 bytes

File Type:

EXE

Memory Resident:

Yes

Initial Samples Received Date:

21 May 2013

Payload:

Compromises system security

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}sacfsfdsf.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 adds the following mutexes to ensure that only one of its copies runs at any one time:

  • -1_cc_{GUID}sacfsfdsf

It injects codes into the following process(es):

  • explorer.exe

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}sacfsfdsf = "%Application Data%\{random}sacfsfdsf.exe"

Other System Modifications

This backdoor adds the following registry keys:

HKEY_CURRENT_USER\Software\{random}sacfsfdsf

It adds the following registry entries:

HKEY_CURRENT_USER\Software\{random}sacfsfdsf
CurrentPath111 = "%Application Data%\{random}sacfsfdsf.exe"

Backdoor Routine

This backdoor executes the following commands from a remote malicious user:

  • Download and execute arbitrary files
  • Update itself
  • Inject arbitrary routines to a running process
  • Delete itself
  • Send logs
  • Edit configuration

It connects to the following websites to send and receive information:

  • http://{BLOCKED}.{BLOCKED}njumbie.biz/images/gx.php
  • http://{BLOCKED}.{BLOCKED}adio.su/images/gx.php
  • http://{BLOCKED}.{BLOCKED}i.su/images/gx.php

  SOLUTION

Minimum Scan Engine:

9.300

FIRST VSAPI PATTERN FILE:

9.940.07

FIRST VSAPI PATTERN DATE:

25 May 2013

VSAPI OPR PATTERN File:

9.941.00

VSAPI OPR PATTERN Date:

26 May 2013

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

Restart in Safe Mode

[ Learn More ]

Step 3

Delete this registry key

[ 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
    • {random}sacfsfdsf

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}sacfsfdsf = "%Application Data%\{random}sacfsfdsf.exe"

Step 5

Restart in normal mode and scan your computer with your Trend Micro product for files detected as BKDR_LIFTOH.QMUU. 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.


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