BKDR_POISON.SMKM

October 08, 2012
 Analysis by: jont
 PLATFORM:

Windows 2000, XP, 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 downloaded by other malware/grayware/spyware from remote sites. It may be unknowingly downloaded by a user while visiting malicious websites.

It opens a hidden Internet Explorer window. It connects to a website to send and receive information.

  TECHNICAL DETAILS

File Size:

Varies

File Type:

PE

Memory Resident:

Yes

Initial Samples Received Date:

01 Dec 2010

Arrival Details

This backdoor may be downloaded by other malware/grayware/spyware from remote sites.

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

Installation

This backdoor injects itself into the following processes running in the affected system's memory:

  • EXPLORER.EXE

Other System Modifications

This backdoor adds the following registry keys as part of its installation routine:

HKEY_CURRENT_USER\Software\Local AppWizard-Generated Applications\
bricks\Settings

HKEY_CURRENT_USER\Software\Local AppWizard-Generated Applications\
bricks\Recent File List

Backdoor Routine

This backdoor opens a hidden Internet Explorer window.

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

  • test.{BLOCKED}.10dig.net

  SOLUTION

Minimum Scan Engine:

8.900

VSAPI OPR PATTERN File:

7.667.00

VSAPI OPR PATTERN Date:

01 Dec 2010

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

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. Before you could do this, you must restart in Safe Mode. For instructions on how to do this, you may refer to this page If the preceding step requires you to restart in safe mode, you may proceed to edit the system registry.

  • In HKEY_CURRENT_USER\Software\Local AppWizard-Generated Applications\
    • bricks

Step 4

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