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Backdoor.Win64.COBEACON.YXEBV

February 23, 2024
 Analysis by: Arianne Grace Dela Cruz
 ALIASES:

Trojan:Win32/CobaltStrike.SD!MTB (MICROSOFT); Win32:CobalStrike-A [Hack] (AVAST)

 PLATFORM:

Windows

 OVERALL RISK RATING:
 DAMAGE POTENTIAL:
 REPORTED INFECTION:

  • Threat Type: Backdoor

  • Destructiveness: No

  • Encrypted: No

  • In the wild: Yes

  OVERVIEW

Infection Channel:

Downloaded from the Internet, Dropped by other malware


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.

It gathers certain information on the affected computer.

  TECHNICAL DETAILS

File Size:

295,936 bytes

File Type:

DLL

Memory Resident:

Yes

Initial Samples Received Date:

22 Feb 2024

Payload:

Collects system information, Connects to URLs/IPs, Steals information

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.

Backdoor Routine

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

  • Connect and disconnect to a named pipe
  • Escalate privileges
  • Execute arbitrary commands
  • Impersonate tokens
  • Inject code into processes
  • Manage directories (Create, Remove, Set Directory)
  • Manage files (List, Create, Delete, Modify, Rename, Copy)
  • Manage processes (List, Create, Terminate)
  • List Drive Information
  • Use/purge Kerberos tickets

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

  • http://{BLOCKED}.{BLOCKED}.{BLOCKED}.146/activity
  • http://{BLOCKED}.{BLOCKED}.{BLOCKED}.146/submit.php

As of this writing, the said sites are inaccessible.

Information Theft

This Backdoor gathers the following information on the affected computer:

  • Username
  • Computer name
  • Current process ID
  • Operating system version and Architecture

Other Details

This Backdoor does the following:

  • It requires to be executed by its main component detected as detected as Trojan.PS1.COBEACON.YXEBV to proceed with its intended routine.

  SOLUTION

Minimum Scan Engine:

9.800

FIRST VSAPI PATTERN FILE:

19.174.07

FIRST VSAPI PATTERN DATE:

22 Feb 2024

VSAPI OPR PATTERN File:

19.175.00

VSAPI OPR PATTERN Date:

23 Feb 2024

Step 1

Trend Micro Predictive Machine Learning detects and blocks malware at the first sign of its existence, before it executes on your system. When enabled, your Trend Micro product detects this malware under the following machine learning name:

     TROJ.Win32.TRX.XXPE50FFF077

Step 2

Before doing any scans, Windows 7, Windows 8, Windows 8.1, and Windows 10 users must disable System Restore to allow full scanning of their computers.

Step 3

Identify and terminate files detected as Backdoor.Win64.COBEACON.YXEBV

[ Learn More ]
  1. Windows Task Manager may not display all running processes. In this case, please use a third-party process viewer, preferably Process Explorer, to terminate the malware/grayware/spyware file. You may download the said tool here.
  2. 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.
  3. If the detected file is not displayed in either Windows Task Manager or Process Explorer, continue doing the next steps.

Step 4

Scan your computer with your Trend Micro product to delete files detected as Backdoor.Win64.COBEACON.YXEBV. 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 the following Trend Micro Support pages for more information:


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