Saturn

Overview

Ransomware:Win32/Saturn is a destructive crypto-ransomware family designed to extort organizations by encrypting critical data and demanding payment in cryptocurrency for the decryption key. It operates on a Ransomware-as-a-Service (RaaS) model, where the core developers lease the malware to various affiliates who handle the distribution and initial infection, splitting the profits. Saturn was notable for offering affiliates a portal to generate custom decryptors and manage their campaigns.

Understanding Saturn (Ransomware)
To an end-user, a Saturn infection is catastrophic. Files become inaccessible, their extensions are changed (e.g., appended with `.saturn`), and a text or HTML file drops onto the desktop demanding a ransom. For an enterprise, it represents a massive incident requiring immediate disaster recovery protocols. The attackers leverage strong encryption (typically AES combined with RSA) (`T1486`) to ensure data recovery is mathematically impossible without the attacker's private key.

Execution and Extortion Mechanics
Saturn is distributed via various methods depending on the affiliate, commonly including malspam (`T1566.001`), exploit kits, or RDP brute-forcing (`T1133`). Upon execution, the malware rapidly disables local recovery options (`T1490`) by executing `vssadmin.exe Delete Shadows /All /Quiet` and disabling Windows Startup Repair. It then traverses local drives and mapped network shares, encrypting files matching specific extensions (documents, databases, images). Finally, it drops the ransom note (`T1491.001`) and changes the desktop wallpaper to ensure the victim is aware of the extortion demand.

Indicators of Compromise & Impact
The impact is severe business disruption, potential data loss, and financial extortion. Host-based IoCs include EDR alerts for rapid, mass file modifications (`T1486`), the execution of `vssadmin.exe` or `bcdedit.exe` to destroy backups, and the presence of the `.saturn` file extensions. The creation of `#!_Saturn_Decrypt_!#.txt` or similar ransom notes in multiple directories is a definitive indicator. Network IoCs may include the initial dropper communicating with known RaaS infrastructure, though the encryption process itself does not require network connectivity.

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

Sigma Rule

title: Suspicious Saturn Activity
id: d027eb0ee23c9fcaa2b9ce4f221c5a77
status: experimental
description: Detects generic indicators of the saturn malware family.
logsource:
    category: process_creation
    product: windows
detection:
    selection:
        Image|endswith:
            - '\cmd.exe'
            - '\powershell.exe'
        CommandLine|contains:
            - "*saturn*"
    condition: selection
level: medium

Containment & Response Steps

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

1. IMMEDIATELY isolate the infected machine from the network (unplug the Ethernet cable) to halt the encryption of mapped network shares and lateral movement.
2. Do not reboot or power off the machine immediately if a live memory capture is possible, as the encryption keys might temporarily reside in RAM.
3. Identify the initial infection vector (e.g., compromised RDP credentials or a phishing email) and close it enterprise-wide.
4. Initiate disaster recovery procedures; wipe the infected machines entirely and restore data from offline, immutable backups.

What to Avoid

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

1. Never pay the ransom; it funds criminal organizations and there is zero guarantee they will provide a working decryption key.
2. Do not connect backup drives or network shares to an infected machine to 'check' the data, as the ransomware will immediately encrypt the backups.

References & External Analysis

• Search "saturn" on VirusTotal (External Analysis)

Frequently Asked Questions

Related Families (Category: ransomware)

Explore other malware families in the same category:

• Amgfaohk2Uf
• Tanspy
• Haknata
• Evillocker
• Trialkiller

Machine-readable

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