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BKDR_QAKBOT.KLT

October 08, 2012
 Analysis by: Christopher Daniel So
 ALIASES:

Backdoor:Win32/Qakbot.gen!A;W32/Pinkslipbot.gen.s;W32/Drooptroop.GYI!tr;Backdoor.Win32.Qakbot

 PLATFORM:

Windows 2000, XP, Server 2003

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

  • Threat Type: Backdoor

  • Destructiveness: No

  • Encrypted: No

  • In the wild: Yes

  OVERVIEW


This backdoor may be dropped by other malware. It may be unknowingly downloaded by a user while visiting malicious websites.

It executes then deletes itself afterward.

  TECHNICAL DETAILS

File Size:

91,136 bytes

File Type:

DLL

Memory Resident:

Yes

Initial Samples Received Date:

29 Oct 2010

Arrival Details

This backdoor may be dropped by other malware.

It may be unknowingly downloaded by a user while visiting malicious websites.

Installation

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

  • %System Root%\all users\Application Data\Microsoft\ovuigsgh1\{random file name}

(Note: %System Root% is the root folder, which is usually C:\. It is also where the operating system is located.)

It executes then deletes itself afterward.

Backdoor Routine

This backdoor connects to the following URL(s) to send and receive commands from a remote malicious user:

  • http://{BLOCKED}n/cgi-bin/jl/jloader.pl?r=q/qa.bin&n=gsdpr5464&it=1&b=82
  • http://{BLOCKED}n/cgi-bin/jl/jloader.pl?is=2&ec1=104&ec2=0&it=1&b=82&n=gsdpr5464

  SOLUTION

Minimum Scan Engine:

8.900

VSAPI PATTERN File:

7.580.03

VSAPI PATTERN Date:

30 Oct 2010

VSAPI PATTERN Date:

10/30/2010 12:00:00 AM

Step 1

For Windows XP and Windows Server 2003 users, before doing any scans, please make sure you disable System Restore to allow full scanning of your computer.

Step 2

Restart in Safe Mode

[ Learn More ]

Step 3

Scan your computer with your Trend Micro product to delete files detected as BKDR_QAKBOT.KLT. 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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