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Backdoor.Win64.JAMCAG.A

January 15, 2025
 Analysis by: Raymart Christian Yambot
 PLATFORM:

Windows

 OVERALL RISK RATING:
 DAMAGE POTENTIAL:
 DISTRIBUTION POTENTIAL:
 REPORTED INFECTION:
 SYSTEM IMPACT RATING:
 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.

It executes commands from a remote malicious user, effectively compromising the affected system.

  TECHNICAL DETAILS

File Size:

178,688 bytes

File Type:

EXE

Memory Resident:

Yes

Initial Samples Received Date:

19 Dec 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.

Backdoor Routine

This Backdoor executes the following commands from a remote malicious user:

  • UPFILE → It is used to upload files from the infected system to a remote server
  • DOWNFILE → It is used to download files from a remote server

Other Details

This Backdoor does the following:

  • It requires to be executed as a service.
  • It establishes a service named 'CheckUpdateService' and connects it to the system's service manager, ensuring the malicious service runs in the background and performs its tasks.
  • It creates a TCP socket and listens for incoming connections by binding it to the following port:
    • 49834

  SOLUTION

Minimum Scan Engine:

9.800

FIRST VSAPI PATTERN FILE:

19.840.01

FIRST VSAPI PATTERN DATE:

14 Jan 2025

VSAPI OPR PATTERN File:

19.841.00

VSAPI OPR PATTERN Date:

15 Jan 2025

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.JAMCAG.A. 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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