BKDR_POISON.BKM

October 09, 2012
 Analysis by: Abraham Latimer Camba
 PLATFORM:

Windows 2000, Windows XP, Windows Server 2003

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

  • Threat Type: Backdoor

  • Destructiveness: No

  • Encrypted: Yes

  • In the wild: Yes

  OVERVIEW

Infection Channel:

Dropped by other malware, Downloaded from the Internet, Spammed via email

This backdoor arrives as an attachment to email messages spammed by other malware/grayware or malicious users. It arrives on a system as a file dropped by other malware or as a file downloaded unknowingly by users when visiting malicious sites.

It does not have any propagation routine.

It does not have any downloading capability.

It logs a user's keystrokes to steal information.

  TECHNICAL DETAILS

Ports:

Port 80

File Size:

54,272 bytes

File Type:

EXE

Memory Resident:

Yes

Initial Samples Received Date:

14 May 2012

Payload:

Compromises system security, Connects to URLs/IPs, Steals information

Arrival Details

This backdoor arrives as an attachment to email messages spammed by other malware/grayware or malicious users.

It 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:

  • {malware path and filename}

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

  • !VoqA.I4

It injects itself into the following processes as part of its memory residency routine:

  • EXPLORER.EXE

Autostart Technique

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

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Active Setup\Installed Components\{GUID}
StubPath = "{malware path and filename}"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Run
xmlprv = "{malware path and filename}"

Propagation

This backdoor does not have any propagation routine.

Backdoor Routine

This backdoor opens the following port(s) where it listens for remote commands:

  • TCP port 8080

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

  • proxy19.{BLOCKED}n.co.jp

Download Routine

This backdoor does not have any downloading capability.

Information Theft

This backdoor logs a user's keystrokes to steal information.

NOTES:

This backdoor does not have rootkit capabilities.

This backdoor does not exploit any vulnerability.

It can perform the following actions:

  • Capture screen, audio, and webcam
  • Log keystrokes
  • List active ports
  • Manage open windows
  • Manage passwords
  • Manage registry, processes, services, devices, and installed applications
  • Perform multiple simultaneous transfers
  • Perform remote shell
  • Relay server
  • Search files
  • Share servers
  • Update, restart, terminates itself

  SOLUTION

Minimum Scan Engine:

9.200

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

Scan your computer with your Trend Micro product and note files detected as BKDR_POISON.BKM

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_LOCAL_MACHINE\SOFTWARE\Microsoft\Active Setup\Installed Components\{GUID}
    • StubPath = "{malware path and filename}"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run
    • xmlprv = "{malware path and filename}"

Step 5

Search and delete these files

[ Learn More ]
There may be some component files that are hidden. Please make sure you check the Search Hidden Files and Folders checkbox in the "More advanced options" option to include all hidden files and folders in the search result.
  • {malware path and filename}

Step 6

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