Matrix

Overview

Ransomware:Win32/Matrix is a highly destructive and targeted ransomware family. Unlike spray-and-pray ransomware distributed via malspam, Matrix operators are known for 'Big Game Hunting', actively penetrating corporate networks, moving laterally, and manually deploying the ransomware to maximize damage and extort massive payouts.

Understanding Matrix
To the victim organization, a Matrix infection is a catastrophic event. Critical servers and workstations are rapidly encrypted, with filenames appended with highly randomized extensions (often including a contact email address, e.g., `.CHKL`) and a ransom note left in every directory. For incident responders, Matrix represents a failure in network perimeter security. The attackers almost exclusively gain initial access by exploiting weakly secured, internet-facing Remote Desktop Protocol (RDP) servers.

Execution, Lateral Movement, and Encryption
The primary initial access vector is brute-forcing or exploiting RDP (TCP 3389) (`T1133`). Once inside, the attackers manually establish persistence, often dropping Mimikatz to dump Domain Admin credentials (`T1003.001`). They use legitimate administrative tools (like PsExec or WMI) to move laterally across the network (`T1021.002`). Before executing the ransomware, they manually disable corporate antivirus and EDR solutions using elevated privileges (`T1562.001`). Matrix then uses `vssadmin.exe` to delete volume shadow copies (`T1490`) and initiates a fast, multi-threaded AES encryption routine (`T1486`).

Indicators of Compromise & Impact
The impact is a total halt of business operations. EDR platforms must alert on the rapid execution of `vssadmin` or the use of PsExec initiating unknown binaries across multiple hosts simultaneously. Network logs will show massive, sustained RDP brute-force attempts leading up to the infection. The presence of encrypted files with specific, contact-email-based extensions is the definitive IoC.

MITRE ATT&CK Techniques

Observed techniques used by this family, mapped to the MITRE ATT&CK framework:

Generated Detections (Boilerplate)

These YARA and Sigma rules are auto-generated based on the family name and aliases. They must be heavily tuned before deployment in a production environment.

YARA Rule

rule MALWARE_WIN_MATRIX {
    meta:
        description = "Detects Matrix (ransomware)"
        author = "SystemHelpdesk Boilerplate Generator"
        date = "2026-07-06"
    strings:
        $s1 = "matrix" ascii wide nocase
    condition:
        uint16(0) == 0x5a4d and any of them
}

Sigma Rule

title: Suspicious Matrix Activity
id: 21b72c0b7adc5c7b4a50ffcb90d92dd6
status: experimental
description: Detects generic indicators of the matrix malware family.
logsource:
    category: process_creation
    product: windows
detection:
    selection:
        Image|endswith:
            - '\cmd.exe'
            - '\powershell.exe'
        CommandLine|contains:
            - "*matrix*"
    condition: selection
level: medium

Containment & Response Steps

Ordered checklist for responders. Adapt to your environment and engage professional support for active incidents.

1. Instantly sever the infected endpoints and servers from the network by pulling the physical cables; the attacker likely has active, interactive RDP access.
2. Do not reboot the servers if they are actively encrypting; rebooting can destroy cryptographic material in RAM.
3. Audit firewall rules immediately to identify and close all Internet-facing RDP ports to prevent reinfection.
4. Initiate a full active directory password reset, as the attackers likely dumped credentials during their lateral movement phase.

What to Avoid

Common mistakes during response to this family that can destroy evidence, spread the infection, or worsen recovery.

1. Do not pay the ransom. Paying funds the criminal enterprise and there is no guarantee the threat actors will provide a working decryptor.
2. Avoid restoring from backups onto the same servers without first completely wiping them and securing the RDP access vector.

References & External Analysis

• Search "matrix" on VirusTotal (External Analysis)

Frequently Asked Questions

Related Families (Category: ransomware)

Explore other malware families in the same category:

• Eroyee
• Mycop
• Figyek
• Virgilio
• Blacked

Machine-readable

Get this profile as JSON: https://jordanricky1604-ship-it.github.io/malware-families-catalog/api/matrix.json

Ecosystem & Interactive Environments

This profile is part of the Malware Families Catalog, a public dataset of 2,899 malware families. The catalog is also published across our ecosystem: Hugging Face, Kaggle, Zenodo, Replit, StackBlitz, CodeSandbox, and CodePen.