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

Canal de infección 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

Tamaño del archivo 255,544 bytes
Tipo de archivo Other
Residente en memoria No
Fecha de recepción de las muestras iniciales 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

Motor de exploración mínimo 9.800
Primer archivo de patrones de VSAPI 18.663.00
Primera fecha de publicación de patrones de VSAPI 28 Aug 2023
Versión de patrones OPR de VSAPI 18.664.00
Fecha de publicación de patrones OPR de VSAPI 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:


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