arrow_back
search
close

BKDR_PLUGX.ZJDD-A

June 27, 2016
 Analysis by: Jennifer Gumban
 ALIASES:

BDS/Plugx.98304 (Antivir), Trojan horse BackDoor.Generic19.ACII (AVG)

 PLATFORM:

Windows

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

  • Threat Type: Backdoor

  • Destructiveness: No

  • Encrypted: Yes

  • In the wild: Yes

  OVERVIEW

Infection Channel:

Dropped by other malware, Downloaded from the Internet


This backdoor arrives on a system as a file dropped by other malware or as a file downloaded unknowingly by users when visiting malicious sites.

It executes commands from a remote malicious user, effectively compromising the affected system.

  TECHNICAL DETAILS

File Size:

98,304 bytes

File Type:

EXE

Memory Resident:

Yes

Initial Samples Received Date:

31 Mar 2016

Payload:

Compromises system security, Terminates processes

Arrival Details

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

  • IESQMMUTEX_0_208

Other System Modifications

This backdoor adds the following registry keys:

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
FAST

It adds the following registry entries:

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
FAST
CLSID = "{random hex values}"

Backdoor Routine

This backdoor executes the following commands from a remote malicious user:

  • Manage files, registries, services and directories
  • Execute files
  • Get drive information
  • Get file information
  • Get mouse and keyboard events
  • Enumerate network resources
  • Display a message box
  • Perfrom port mapping
  • Run application
  • Capture screen
  • Enumerate registry keys
  • Get service information
  • Start services
  • Perform remote shell

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

  • http://{BLOCKED}.{BLOCKED}.253.183/update?id={id}

  SOLUTION

Minimum Scan Engine:

9.800

FIRST VSAPI PATTERN FILE:

12.464.03

FIRST VSAPI PATTERN DATE:

13 Apr 2016

VSAPI OPR PATTERN File:

12.465.00

VSAPI OPR PATTERN Date:

14 Apr 2016

Step 1

Before doing any scans, Windows XP, Windows Vista, and Windows 7 users must disable System Restore to allow full scanning of their computers.

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.

  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes
    • FAST = ""

Step 4

Restart in normal mode and scan your computer with your Trend Micro product for files detected as BKDR_PLUGX.ZJDD-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.


Did this description help? Tell us how we did.