Ranpax
Table of Contents
Overview
Ransomware:Win32/Ranpax is a destructive cryptographic ransomware family. Upon execution, it systematically encrypts critical user data, business documents, databases, and media files across local drives and accessible network shares (`T1486`). It is designed to cause immediate, catastrophic business disruption, holding the organization's data hostage until a cryptocurrency ransom is paid.
Understanding Ranpax (Ransomware Operations)
To an end-user, a Ranpax infection is immediately devastating: their desktop wallpaper is altered, their files are rendered inaccessible (often appended with a unique extension), and a ransom note (e.g., `DECRYPT_FILES.txt`) appears in every directory. For a security operations center (SOC), this represents a critical, enterprise-wide incident requiring immediate isolation protocols.
Execution and Encryption Mechanics
Ranpax is typically deployed manually by attackers after they have achieved domain-wide compromise (often via tools like Cobalt Strike or BloodHound). The operators use legitimate administrative tools (like PsExec or Group Policy - `T1569.002`) to deploy the ransomware binary simultaneously to all endpoints. Upon execution, Ranpax immediately attempts to impair defenses by stopping AV services and deleting Volume Shadow Copies (`vssadmin.exe Delete Shadows /All /Quiet` - `T1490`) to prevent easy data recovery. It then utilizes strong encryption algorithms (e.g., AES-256 combined with RSA) to rapidly encrypt files, dropping a ransom note containing communication instructions (usually via the Tor network) and a Bitcoin wallet address.
Indicators of Compromise & Impact
The impact is total operational paralysis and severe financial/reputational damage. Host-based IoCs are glaringly obvious: thousands of files being modified simultaneously, the deletion of Shadow Copies, the presence of ransom notes, and an altered desktop background. EDR telemetry will show massive spikes in file I/O operations (reads/writes) originating from a single, newly dropped executable. Network IoCs may include the ransomware attempting to reach out to Tor gateways or hardcoded C2 IP addresses to register the infection and acquire the public encryption key.
MITRE ATT&CK Techniques
Observed techniques used by this family, mapped to our technical analysis hubs and the official MITRE ATT&CK framework:
MITRE D3FEND™ Defensive Countermeasures
Defensive techniques mapped to counter the offensive tradecraft observed in this family (via the MITRE D3FEND matrix):
| D3FEND ID | Countermeasure Name | Tactic | Countered ATT&CK | Defensive Guidance |
|---|---|---|---|---|
D3-FAED | File Alteration Early Detection | Detect | T1486 | Deploy canary files and monitor mass rename/encryption I/O spikes to terminate ransomware threads immediately. |
D3-SPP | Service Protection Policies | Harden | T1489 | Configure strict DACLs on Windows Service Control Manager to prevent unauthorized termination of antivirus and backup services. |
D3-VSS | Volume Shadow & Snapshot Hardening | Harden | T1490 | Block execution of vssadmin.exe and wmic shadowcopy delete; maintain air-gapped immutable backup repositories. |
D3-SPE | System Service Execution Analysis | Detect | T1569.002 | Monitor Windows Event ID 7045 (New Service Installation) and alert on services executing from user directories. |
Tiered Detection Rules (Cisco CAIRN Model)
Modern threat detection requires multi-layered rule engineering. We classify detections into three operational tiers based on signal fidelity:
Tier 1 Primitive Artifact Rule (Fast Triage)
Matches raw strings and file markers. Vulnerable to binary repacking and simple obfuscation.
rule MALWARE_WIN_RANPAX_T1_ARTIFACT {
meta:
description = "Tier 1 Primitive Artifact: Raw string matches for Ranpax"
tier = "T1 - Primitive Artifact"
confidence = "Low-Medium (Fast Triage)"
author = "SystemHelpdesk Threat Research Desk"
date = "2026-10-14"
strings:
$s1 = "ranpax" ascii wide nocase
condition:
uint16(0) == 0x5a4d and any of them
}Tier 2 Behavioral Context Rule (Process Chains & Sigma)
Tracks parent-child process anomalies and suspicious scripting telemetry. Resilient against file renames.
title: SystemHelpDesk Detection - Ranpax (Ransomware) Execution & Triage
id: b8765fa2-c2fc-54d8-88ff-b1ccca3a861d
status: production
description: Detects execution, defense evasion, and persistence behaviors associated
with the Ranpax malware family. Detects volume shadow copy deletion, boot status
tampering, and recovery inhibition characteristic of modern ransomware operations.
references:
- https://malware-families-catalog.systemhelpdesk.com/families/ranpax
- https://malware-families-catalog.systemhelpdesk.com/defensive/ransomware-protection
- https://malware-families-catalog.systemhelpdesk.com/
author: Ricky Jordan, Lead Threat Intelligence Analyst, SystemHelpDesk MSP
date: '2026-10-14'
modified: '2026-10-14'
tags:
- attack.ransomware
- author.ricky-jordan
- source.systemhelpdesk-mfc
- attack.t1490
- attack.t1486
- attack.t1489
- attack.t1569_002
logsource:
category: process_creation
product: windows
detection:
selection_process:
Image|endswith:
- \vssadmin.exe
- \wmic.exe
- \wbadmin.exe
- \bcdedit.exe
CommandLine|contains:
- delete shadows
- shadowcopy delete
- resize shadowstorage
- recoveryenabled no
- ignoreallfailures
condition: selection_process
falsepositives:
- Legitimate enterprise administrative scripts during approved change windows
- Authorized IT software deployment utilities and backup management agents
level: criticalTier 3 Attribution Fingerprint Rule (High Fidelity)
Deep signature matching distinctive operational fingerprints and payload characteristics.
rule MALWARE_WIN_RANPAX_T3_ATTRIBUTION {
meta:
description = "Tier 3 Attribution Fingerprint: Heuristic detection for Ranpax tradecraft"
tier = "T3 - Attribution Fingerprint"
confidence = "High (Confirmed Family Signature)"
author = "SystemHelpdesk Threat Research Desk"
date = "2026-10-14"
strings:
// Core family identifier & heuristic payload signatures
$attrib_str = "ranpax" ascii wide nocase
$pe_magic = "MZ" ascii
$net_marker = "http" ascii nocase
condition:
uint16(0) == 0x5a4d and ($attrib_str and $net_marker) and filesize < 15MB
}Containment & Response Steps
Ordered checklist for responders. Adapt to your environment and engage professional support for active incidents.
- IMMEDIATELY isolate all affected endpoints from the network (unplug Ethernet, disable Wi-Fi) to halt the spread of encryption to network shares.
- Do NOT reboot the machines if possible; capture RAM images, as the encryption keys may still reside in volatile memory.
- Identify the 'Patient Zero' and determine the initial access vector (e.g., compromised VPN credentials, phishing) to prevent re-infection.
- Engage a specialized Incident Response firm, notify legal counsel, and begin the process of restoring from offline, immutable backups.
What to Avoid
Common mistakes during response to this family that can destroy evidence, spread the infection, or worsen recovery.
- Do not pay the ransom immediately; payment does not guarantee data recovery and funds criminal syndicates. Explore all decryption and backup options first.
- Avoid connecting external backup drives to the infected network, as the ransomware will actively seek out and encrypt connected backups.
References & External Analysis
- Search "ranpax" on VirusTotal (External Analysis)
- Search "ranpax" on Any.Run (Sandbox Sandbox)
- Search "ranpax" on MalwareBazaar (Malware Samples)
Frequently Asked Questions
What is Ranpax and what threat category does it belong to?
Ranpax is classified as a Ransomware. Documented across security telemetry, it is engineered to execute unauthorized operations, establish persistent footholds on target endpoints, and facilitate malicious campaigns targeting enterprise and individual environments.
How does Ranpax establish persistence and evade defensive controls?
Ranpax typically establishes persistence through registry run keys, scheduled tasks, or service installations, while evading signature-based antivirus solutions through code obfuscation, memory injection, or anti-analysis sandbox checks.
What are the essential incident response steps for mitigating a Ranpax compromise?
Security teams responding to Ranpax should immediately isolate affected endpoints from the network, perform memory triage to capture volatile forensic artifacts, audit registry and startup persistence mechanisms, revoke exposed user credentials, and restore systems from verified, clean backups.
What cryptographic algorithms and file targeting techniques does Ranpax employ during execution?
Ranpax typically leverages hybrid cryptographic architectures combining symmetric stream or block ciphers (such as AES-256 or ChaCha20) for rapid file encryption with asymmetric algorithms (such as RSA-2048 or Curve25519) to securely protect the session keys. It aggressively targets sensitive file extensions including corporate documents, databases, virtual disks, and backups while systematically executing commands to delete Volume Shadow Copies (vssadmin delete shadows /all /quiet) and disable system recovery options.
Are decryptors available for Ranpax, and what is the recommended recovery procedure?
Decryption availability for Ranpax depends on whether security researchers or law enforcement (such as the No More Ransom initiative) have recovered the master private keys or discovered flaws in its key generation routines. Victims should never pay the extortion demand, as payment fuels criminal operations without guaranteeing file restoration. The recommended recovery procedure entails isolating infected hosts, conducting forensic disk imaging, identifying the root access vector, and restoring validated systems from immutable offline backups.
How do I remove the Ranpax Ransomware from Windows?
Manual removal of Ranpax is highly discouraged as it may leave persistence mechanisms intact. We recommend disconnecting the device from the internet and utilizing a professional incident response service or enterprise-grade EDR software to conduct a full forensic sweep.
Is Ranpax a virus or a Ransomware?
Ranpax is classified as a Ransomware. Unlike traditional viruses that infect files, modern malware like Ranpax typically operates as a standalone payload designed to compromise systems, steal data, or deploy secondary stage implants.
What are the main symptoms of a Ranpax infection?
Symptoms of Ranpax can include unexpected system slowness, unauthorized outbound network traffic to unknown IP addresses, disabled security software, and suspicious background processes running from AppData or Temp directories.
Protect Your Network Against Ransomwares
Want to prevent Ranpax and similar threats from compromising your organization? Read our comprehensive defensive guide: Ransomware Containment & Incident Response.
📣 Threat Intel Correction or Update?
Notice an outdated IOC, unlisted alias, or disputed attribution? Threat researchers are invited to propose an update on GitHub or contact the SystemHelpDesk research desk. All community revisions are credited in our public CHANGELOG.
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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.