BKDR_BARKIOFOR.B

May 09, 2014
 Analysis by: Mark Joseph Manahan
 ALIASES:

Trojan horse Proxy.BCBB (AVG) ,W32/Agent.DKK!tr (Fortinet) ,Trojan.Win32.Barkiofork (Ikarus) ,Trojan-Proxy.Win32.Agent.dkk (Kaspersky) ,Trojan:Win32/Barkiofork.B (Microsoft) ,Win32/Agent.OJH trojan (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:
 INFORMATION EXPOSURE:

  • Threat Type: Backdoor

  • Destructiveness: No

  • Encrypted: No

  • 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:

81,920 bytes

File Type:

DLL

Memory Resident:

Yes

Initial Samples Received Date:

07 May 2014

Payload:

Compromises system security, Connects to URLs/IPs

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 non-malicious file:

  • %User Temp%\~ISUN32.exe - Cmd.exe

(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.)

Backdoor Routine

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

  • File & Directory Manipulation
  • List Drivers
  • Reboot Machine
  • Get System Information
  • Remote Command Shell
  • Download and Execute Files
  • Upload Files
  • Load Additional Plugins

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

  • update.{BLOCKED}e.{BLOCKED}s.com:443
  • update.{BLOCKED}e.{BLOCKED}s.com:80

Download Routine

This backdoor connects to the following URL(s) to download its component file(s):

  • http://{BLOCKED}.{BLOCKED}.70.155:80/microsoft/product/windows/update/asp?{value}

Other Details

This backdoor requires the following additional components to properly run:

  • {Malware Path}\msd3.dat
  • %System%\drivers\rio16drv.sys
  • {Malware Path}\msxml.log

(Note: %System% is the Windows system folder, which is usually C:\Windows\System32.)

  SOLUTION

Minimum Scan Engine:

9.700

FIRST VSAPI PATTERN FILE:

10.780.04

FIRST VSAPI PATTERN DATE:

07 May 2014

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

Scan your computer with your Trend Micro product to delete files detected as BKDR_BARKIOFOR.B. 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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