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Backdoor.Win32.COBEACON.SMJMAC

August 17, 2024
 Analysis by: John Rainier Navato
 ALIASES:

MalwThreat!0971IV, PDF/Pidief.DP!exploit (FORTINET)

 PLATFORM:

Windows

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

  • Threat Type: Backdoor

  • Destructiveness: No

  • Encrypted:

  • In the wild: Yes

  OVERVIEW


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.

  TECHNICAL DETAILS

File Size:

60,439 bytes

File Type:

PDF

Initial Samples Received Date:

15 Aug 2024

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 drops the following files:

  • {Chosen File Path By User}\form.pdf

It adds the following processes:

  • %System%\cmd.exe /Q /C %HOMEDRIVE%&cd %HOMEPATH%&(if exist "Desktop\form.pdf" (cd "Desktop"))&(if exist "My Documents\form.pdf" (cd "My Documents"))&(if exist "Documents\form.pdf" (cd "Documents"))&(if exist "Escritorio\form.pdf" (cd "Escritorio"))&(if exist "Mis Documentos\form.pdf" (cd "Mis Documentos"))&(start form.pdf)
  • form.pdf
  • cmd

  SOLUTION

Minimum Scan Engine:

9.800

FIRST VSAPI PATTERN FILE:

18.254.05

FIRST VSAPI PATTERN DATE:

13 Feb 2023

VSAPI OPR PATTERN File:

18.255.00

VSAPI OPR PATTERN Date:

14 Feb 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

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 3

Search and delete this file

[ Learn More ]
There may be some files that are hidden. Please make sure you check the Search Hidden Files and Folders checkbox in the "More advanced options" option to include all hidden files and folders in the search result.
  • {Chosen File Path By User}\form.pdf

Step 4

Scan your computer with your Trend Micro product to delete files detected as Backdoor.Win32.COBEACON.SMJMAC. 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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