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BKDR_MUSMINIM.A

October 08, 2012
 Analysis by: Karl Dominguez
 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


This remote administration tool (RAT) is the Windows counterpart of the Mac OSX malware that Trend Micro detected as OSX_MUSMINIM.A.

This backdoor may be unknowingly downloaded by a user while visiting malicious websites. It may be manually installed by a user.

  TECHNICAL DETAILS

File Size:

Varies

File Type:

PE

Memory Resident:

Yes

Initial Samples Received Date:

26 Feb 2011

Arrival Details

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

It may be manually installed by a user.

NOTES:

Other Details

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

  • Execute remote shell commands
  • Show a URL using the default browser of the affected system
  • Force the user to input log-in credentials
  • Shutdown the remote computer
  • Restart the remote computer
  • Put the system into sleep mode
  • Send a message
  • Create a text file on the desktop
  • Display a window with a message from the attacker that can only be removed by rebooting
  • Displays the following graphical user interface (GUI):







  SOLUTION

Minimum Scan Engine:

8.900

FIRST VSAPI PATTERN FILE:

7.864.05

FIRST VSAPI PATTERN DATE:

28 Feb 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

Identify and terminate files detected as BKDR_MUSMINIM.A

[ 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 3

Scan your computer with your Trend Micro product to delete files detected as BKDR_MUSMINIM.A. 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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