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BKDR_POISON.KCG

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: No

  • In the wild: Yes

  OVERVIEW


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

  TECHNICAL DETAILS

File Size:

65,536 bytes

File Type:

EXE

Memory Resident:

Yes

Initial Samples Received Date:

06 Apr 2012

Arrival Details

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

Installation

This backdoor adds the following folders:

  • %System Root%\dfed

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

It drops the following files:

  • %System Root%\ewoklsoiewlks

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

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\{B68C18DB-746D-BE64-9144-1AD087584062}
StubPath = "{malware path and filename}"

Other System Modifications

This backdoor adds the following registry keys:

HKEY_CURRENT_USER\Software\ations

HKEY_CURRENT_USER\Software\ations\

HKEY_CURRENT_USER\Software\ations\
\Recent File List

HKEY_CURRENT_USER\Software\ations\
\Settings

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Active Setup\Installed Components\{B68C18DB-746D-BE64-9144-1AD087584062}

Backdoor Routine

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

  • dd.{BLOCKED}oapis.com

  SOLUTION

Minimum Scan Engine:

9.200

FIRST VSAPI PATTERN FILE:

8.890.04

FIRST VSAPI PATTERN DATE:

06 Apr 2012

VSAPI OPR PATTERN File:

8.891.00

VSAPI OPR PATTERN Date:

07 Apr 2012

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.KCG

Step 3

Restart in Safe Mode

[ Learn More ]

Step 4

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_LOCAL_MACHINE\SOFTWARE\Microsoft\Active Setup\Installed Components
    • {B68C18DB-746D-BE64-9144-1AD087584062}
  • In HKEY_CURRENT_USER\Software
    • ations

Step 5

Search and delete this folder

[ Learn More ]
Please make sure you check the Search Hidden Files and Folders checkbox in the More advanced options option to include all hidden folders in the search result.  
  • %System Root%\dfed

Step 6

Search and delete this file

[ 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.
  • %System Root%\ewoklsoiewlks

Step 7

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

NOTES:

  1. This malware is detected and removed by the latest Trend Micro anti-malware engine and pattern. Always keep pattern files and engines up-to-date. To know more about updating your Trend Micro product’s pattern, please refer to the Trend Micro support page.
    Note: The steps apply for specific products indicated in the page.
  2. To actively detect and protect your machine, enable real-time scanning of your Trend Micro anti-malware product. Refer to the following Trend Micro support page to know more about enabling real-time scanning in your Trend Micro product:
  3. Block unused ports to disallow malware from using these ports to communicate and/or enforce commands.
  4. Be aware of social engineering attacks.
  5. Avoid accessing the listed malicious URLs to prevent possible re-infection.
  6. Regularly update list of sites that are trusted.
  7. Configure your email server to block or remove email that contain file attachments using extensions such as .VBS, .BAT, .EXE, .PIF and .SCR files.
  8. Avoid opening email attachments and clicking links in an email from unknown source.
  9. Implement an email policy of archiving attachments with a password.
  10. Block any file with more than one file type extension.
  11. Hide your SSID..
  12. When a computer is compromised, isolate it immediately from the network.
  13. Disable AutoPlay to avoid automatic execution of executable files in removable drives.
  14. Disconnect drives when not needed. If write access is not required, enable read-only mode only.
  15. Configure your system to show hidden files and folders and display file extensions.
  16. Don’t save login credentials on the local computer.


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