Reveton

Overview

Ransom:Win32/Reveton represents a historically significant evolutionary step in cyber extortion, commonly known as **'Police Ransomware' or a 'Screen Locker'**. Predating the widespread use of modern crypto-ransomware (which encrypts files), Reveton operated entirely on social engineering and intimidation. It locked the victim's computer screen, preventing access to the Windows desktop, and displayed a highly realistic, localized warning message claiming to be from the FBI, Interpol, or local law enforcement. The message accused the user of illegal activities (such as downloading pirated media or viewing child pornography) and demanded an immediate 'fine' paid via prepaid vouchers like Ukash, Paysafecard, or MoneyPak.

Understanding Reveton (Screen Lockers)
To an end-user, Reveton was terrifying; the computer was completely unusable, the warning looked official (often featuring logos of local police), and it frequently utilized the victim's webcam to display a live feed of their face on the ransom note, maximizing the psychological pressure. For a SOC analyst, Reveton was a nuisance malware that relied on restricting access to the shell, rather than destroying data. However, later variants were often bundled with password stealers (like Citadel or Zeus) acting in the background.

Execution and Locking Mechanics
Reveton was primarily distributed via Exploit Kits (like Blackhole or Cool EK) hosted on compromised websites or malvertising networks (`T1189`). When a vulnerable browser navigated to the site, the exploit executed the Reveton payload silently (`T1203`). Upon execution, Reveton immediately established persistence, often by modifying the `Winlogon\Shell` registry key (`T1547.004`). Instead of loading `explorer.exe` on boot, Windows would load the Reveton executable. The malware then launched a full-screen, borderless window (`T1491.001`) that could not be closed via Alt+F4 or Task Manager (`T1562.001`). It determined the victim's geographic location via IP address (`T1614.001`) to display a customized ransom note in the local language, citing local laws.

Indicators of Compromise & Impact
The impact was a complete denial of service to the workstation, though data was usually unharmed. Host-based IoCs were obvious: the inability to access the desktop, Task Manager, or Start menu, and the presence of anomalous executables in the `Winlogon\Shell` or `Userinit` registry keys. Network IoCs included traffic to C2 servers to download the localized HTML/image templates for the ransom note.

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):

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:

rule MALWARE_WIN_REVETON_T1_ARTIFACT {
    meta:
        description = "Tier 1 Primitive Artifact: Raw string matches for Reveton"
        tier = "T1 - Primitive Artifact"
        confidence = "Low-Medium (Fast Triage)"
        author = "SystemHelpdesk Threat Research Desk"
        date = "2026-10-14"
    strings:
        $s1 = "reveton" ascii wide nocase
    condition:
        uint16(0) == 0x5a4d and any of them
}

title: SystemHelpDesk Detection - Reveton (Ransomware) Execution & Triage
id: 2e745857-0f4f-5231-9a62-1da49f47f045
status: production
description: Detects execution, defense evasion, and persistence behaviors associated
  with the Reveton 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/reveton
- 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.t1562_001
- attack.t1547_004
- attack.t1491_001
- attack.t1189
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: critical

rule MALWARE_WIN_REVETON_T3_ATTRIBUTION {
    meta:
        description = "Tier 3 Attribution Fingerprint: Heuristic detection for Reveton 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 = "reveton" 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.

1. Do not pay the 'fine'; it is a scam, and law enforcement agencies do not lock computers and demand prepaid vouchers.
2. Boot the infected machine into 'Safe Mode with Command Prompt' or use a bootable USB rescue disk (like a WinPE environment) to bypass the `Winlogon` hijack.
3. Use the offline Registry Editor (`regedit`) to navigate to `HKLM\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon` and restore the `Shell` value to `explorer.exe`.
4. Once access is restored, run a comprehensive malware scan, as Reveton was often distributed alongside banking trojans (like Citadel) that operated silently in the background.

What to Avoid

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

1. Avoid confronting the user about the accusations on the screen (e.g., piracy); the warnings are completely fabricated and generated for all victims regardless of their actual browsing history.
2. Do not simply reboot the computer normally; the persistence mechanism ensures the locker will immediately re-engage upon login.

References & External Analysis

• Search "reveton" on VirusTotal (External Analysis)
• Search "reveton" on Any.Run (Sandbox Sandbox)
• Search "reveton" on MalwareBazaar (Malware Samples)

Frequently Asked Questions

Related Threats (Category: Ransomware)

Explore other documented threats in the same operational category:

• Orcusrat
• Cafecup
• Kryptyk
• Vedpoz
• Bits
• Iczu
• Glukelira
• Mediaget

Machine-readable

Get this profile as JSON: https://malware-families-catalog.systemhelpdesk.com/api/reveton.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.