Analysis by: Raighen Sanchez
ALIASES:

TrojanDownloader:JS/RemcosRAT.PA!MTB (MICROSOFT)

 PLATFORM:

Windows

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

  • Threat Type: Trojan

  • Destructiveness: No

  • Encrypted: No

  • In the wild: Yes

  OVERVIEW

Infection Channel: Downloaded from the Internet, Dropped by other malware

This Trojan arrives on a system as a file dropped by other malware or as a file downloaded unknowingly by users when visiting malicious sites.

It does not have any propagation routine.

It does not have any backdoor routine.

However, as of this writing, the said sites are inaccessible.

  TECHNICAL DETAILS

File Size: 204,273 bytes
File Type: JS
Memory Resident: No
Initial Samples Received Date: 26 Sep 2025
Payload: Steals information, Connects to URLs/IPs

Arrival Details

This Trojan arrives on a system as a file dropped by other malware or as a file downloaded unknowingly by users when visiting malicious sites.

Propagation

This Trojan does not have any propagation routine.

Backdoor Routine

This Trojan does not have any backdoor routine.

Rootkit Capabilities

This Trojan does not have rootkit capabilities.

Download Routine

This Trojan connects to the following website(s) to download and execute a malicious file:

  • http://{BLOCKED}t.ct.ws/arquivo_921c3a6dd6ec49e3a8a787d7f39decc2.txt

Information Theft

This Trojan gathers the following data:

  • List of Installed Software and Devices
  • Hardware Devices Information
  • Network Configuration
  • GPU Settings
  • BIOS Information
  • OS Version
  • User Account Information

Other Details

However, as of this writing, the said sites are inaccessible.

It does not exploit any vulnerability.

  SOLUTION

Minimum Scan Engine: 9.800
FIRST VSAPI PATTERN FILE: 20.508.05
FIRST VSAPI PATTERN DATE: 08 Oct 2025
VSAPI OPR PATTERN File: 20.509.00
VSAPI OPR PATTERN Date: 09 Oct 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 Trojan.JS.REMCOS.D. 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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