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BKDR_POISON.TKR

October 09, 2012
 ALIASES:

Symantec: Backdoor.Trojan; Microsoft: Backdoor:Win32/Poison.M; Kaspersky: Backdoor.Win32.Poison.cohu

 PLATFORM:

Windows 2000, Windows XP, Windows Server 2003

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

  • Threat Type: Backdoor

  • Destructiveness: No

  • Encrypted: No

  • In the wild: Yes

  OVERVIEW

This backdoor may be dropped by other malware.

It connects to a website to send and receive information.

  TECHNICAL DETAILS

File Size:

53,080 bytes

File Type:

EXE

Memory Resident:

Yes

Initial Samples Received Date:

09 Aug 2011

Arrival Details

This backdoor may be dropped by the following malware:

  • TROJ_ARTIEF.VNI

Installation

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

  • 223456

It is injected into the following processes running in memory:

  • explorer.exe
  • csrss.exe

Autostart Technique

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

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Run
winupdate = {malware path and file name}

Backdoor Routine

This backdoor connects to the following websites to send and receive information:

  • {BLOCKED}er.dyndns.org

Other Details

Based on analysis of the codes, it has the following capabilities:

  • It checks the firewall settings of the affected system.
  • It enumerates Internet Connection Firewall properties and port mappings on a computer.
  • It checks if the firewall settings have been configured to allow DHCP and DNS.

  SOLUTION

Minimum Scan Engine:

8.900

FIRST VSAPI PATTERN FILE:

8.344.07

FIRST VSAPI PATTERN DATE:

09 Aug 2011

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

Remove malware files dropped/downloaded by BKDR_POISON.TKR

    TROJ_ARTIEF.VNI

Step 3

Identify and terminate files detected as BKDR_POISON.TKR

[ Learn More ]
  1. If the detected file is displayed in either Windows Task Manager or Process Explorer but you cannot delete it, restart your computer in safe mode. To do this, refer to this link for the complete steps.
  2. If the detected file is not displayed in either Windows Task Manager or Process Explorer, continue doing the next steps.

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\Windows\CurrentVersion\Run
    • winupdate = {malware path and file name}

Step 5

Scan your computer with your Trend Micro product to delete files detected as BKDR_POISON.TKR. 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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