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Backdoor.Win64.COBEACON.YXEEP

May 28, 2024
 Analysis by: Melvin Jhun Palbusa
 PLATFORM:

Windows

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

  • Threat Type: Backdoor

  • Destructiveness: No

  • Encrypted:

  • 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:

530,944 bytes

File Type:

DLL

Memory Resident:

No

Initial Samples Received Date:

13 May 2024

Payload:

Collects system information, Connects to URLs/IPs, Executes commands

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 injects codes into the following process(es):

  • Created %system%\nsass.exe

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:

  • {BLOCKED}ht22.execute-api.us-west-1.amazonaws.com
  • {BLOCKED}jfwg.execute-api.ap-northeast-1.amazonaws.com

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

  SOLUTION

Minimum Scan Engine:

9.800

FIRST VSAPI PATTERN FILE:

19.352.04

FIRST VSAPI PATTERN DATE:

20 May 2024

VSAPI OPR PATTERN File:

19.353.00

VSAPI OPR PATTERN Date:

21 May 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.XXPE50FFF080

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

Note that not all files, folders, and registry keys and entries are installed on your computer during this malware's/spyware's/grayware's execution. This may be due to incomplete installation or other operating system conditions. If you do not find the same files/folders/registry information, please proceed to the next step.

Step 4

Scan your computer with your Trend Micro product to delete files detected as Backdoor.Win64.COBEACON.YXEEP. 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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