Backdoor.Win64.COBEACON.OSLJEE

September 20, 2023
 Analysis by: Raymart Christian Yambot
 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:

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 listens on port(s).

  TECHNICAL DETAILS

File Size:

255,544 bytes

File Type:

Other

Memory Resident:

No

Initial Samples Received Date:

08 Aug 2023

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 listens on the following port(s):

  • TCP 49526

Other Details

This Backdoor requires the following additional components to properly run:

  • %System32%/OCI.dll - Detected as Backdoor.Win64.COBEACON.OSLJEM

It does the following:

  • It is loaded by OCI.dll through legitimate service ‘msdtc’ or Microsoft Distributed Transaction Coordinator.
  • This sample needs to be located in the %System% directory and have a file name of 'perfx0000.dat' to execute properly.

(Note: %System% is the Windows system folder, where it usually is C:\Windows\System32 on all Windows operating system versions.)

  SOLUTION

Minimum Scan Engine:

9.800

FIRST VSAPI PATTERN FILE:

18.663.00

FIRST VSAPI PATTERN DATE:

28 Aug 2023

VSAPI OPR PATTERN File:

18.664.00

VSAPI OPR PATTERN Date:

29 Aug 2023

Step 1

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 2

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


Did this description help? Tell us how we did.