Analysis by: Mariefher Grace Villanueva
 PLATFORM:

Windows

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

  • Threat Type: Ransomware

  • Destructiveness: No

  • Encrypted: No

  • In the wild: Yes

  OVERVIEW

This Ransomware 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.

It does not have any information-stealing capability.

  TECHNICAL DETAILS

File Size: 417,280 bytes
File Type: EXE
Memory Resident: No
Initial Samples Received Date: 06 Oct 2026
Payload: Drops files

Arrival Details

This Ransomware 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 Ransomware drops the following files:

Propagation

This Ransomware does not have any propagation routine.

Backdoor Routine

This Ransomware does not have any backdoor routine.

Rootkit Capabilities

This Ransomware does not have rootkit capabilities.

Information Theft

This Ransomware does not have any information-stealing capability.

Other Details

This Ransomware does the following:

  • Loads the dropped DLL (MyPayload.dll) to execute the ransomware payload.
  • It accepts the following as parameters and passes the received command-line parameters directly to the loaded DLL:
    • --fast → Accelerates encryption by directly applying partial header encryption
    • --gpo → Creates and deploys an Active Directory Group Policy Object (GPO) scheduled task
    • --local → Restricts encryption routine strictly to local fixed drives
    • --net → Enables subnet sweeps for port 445 (SMB) and enumerates remote network shares
    • --quiet → Executes silently in the background without console logging or UI indicators
    • --readme → Drops the ransom note YOU ARE UNDER ATTACK!.html without encrypting files
    • {Path} → Targets the specified directory path for encryption

It does not exploit any vulnerability.

  SOLUTION

Minimum Scan Engine: 9.800
FIRST VSAPI PATTERN FILE: 21.364.03
FIRST VSAPI PATTERN DATE: 07 Oct 2026
VSAPI OPR PATTERN File: 21.365.00
VSAPI OPR PATTERN Date: 08 Oct 2026

Step 1

Trend Micro Predictive Machine Learning detects and blocks malware at the first sign of its existence, before it executes on your system. When enabled, your Trend Micro product detects this malware under the following machine learning name:

    Ransom.Win32.TRX.XXPE50FFF110

Step 2

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 3

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 4

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.
  • %User Temp%\MyPayload.dll

Step 5

Scan your computer with your Trend Micro product to delete files detected as Ransom.Win64.EXITIUM.C. 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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