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Backdoor.Win64.COBEACON.OSLJET

March 27, 2023
 Analysis by: Jayvee Mark Villaroman
 ALIASES:

Trojan:Win64/CobaltStrike.GFT!MTB (MICROSOFT)

 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:

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.

  TECHNICAL DETAILS

File Size:

156,160 bytes

File Type:

EXE

Memory Resident:

Yes

Initial Samples Received Date:

21 Mar 2023

Payload:

Steals information, Connects to URLs/IPs

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
  • List drive information
  • Manage directories (Create, Remove, Set Directory)
  • Manage files (List, Create, Delete, Modify, Move, Copy)
  • Manage processes (List, Create, Suspend, Terminate)
  • Upload/download files

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

  • {BLOCKED}.{BLOCKED}.{BLOCKED}.246

Information Theft

This Backdoor gathers the following data:

  • Username
  • Computer Name
  • OS Version
  • Executable used to load the sample

Other Details

This Backdoor does the following:

  • It requires being executed in a specific directory and using a specific file name to proceed with its intended routine.
  • It connects to the following URL to download its component which it will load in its memory and perform its malicious routine:
    • https://d{BLOCKED}torage.firmware.keenetic.pro/Communicate/certenroll/LGKWDB7K

  SOLUTION

Minimum Scan Engine:

9.800

FIRST VSAPI PATTERN FILE:

18.346.03

FIRST VSAPI PATTERN DATE:

27 Mar 2023

VSAPI OPR PATTERN File:

18.347.00

VSAPI OPR PATTERN Date:

28 Mar 2023

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.XXPE50FFF066

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

Restart in normal mode and scan your computer with your Trend Micro product for files detected as Backdoor.Win64.COBEACON.OSLJET. 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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