Fraudkrypt
Table of Contents
Overview
Ransomware:Win32/Fraudkrypt is a malicious hybrid that blends the extortion tactics of Scareware with the destructive capability of Ransomware. Its primary objective is to frighten the user into paying a fee by locking the screen or encrypting a subset of files (`T1486`), often using a heavily customized, deceptive GUI that mimics law enforcement agencies or fake antivirus alerts (`T1491.002`).
Understanding Fraudkrypt (Scareware/Ransomware)
To an end-user, Fraudkrypt is terrifying. They are presented with a full-screen, uncloseable window claiming they have committed a crime or their computer is hopelessly corrupted, demanding immediate payment (often via pre-paid cards or Bitcoin) to 'unlock' the system. For an IT department, Fraudkrypt variants vary wildly in severity; some merely lock the screen (easily bypassed), while others actively encrypt data.
Execution and Extortion Mechanics
Fraudkrypt is typically delivered via exploit kits, malicious downloads, or spam. Upon execution, it immediately alters the Windows Registry (e.g., changing the `Shell` or `Userinit` keys in `Winlogon`) (`T1547.004`) to ensure its lock-screen launches immediately upon boot, before the user can access the desktop. It then either encrypts files or simply hides them (`T1564.001`), replacing the wallpaper with its extortion demand. It disables Task Manager and Registry Editor to prevent the user from terminating the process.
Indicators of Compromise & Impact
The impact ranges from severe user distress and downtime to actual data loss if encryption is used. Host-based IoCs include the highly visible, often poorly translated extortion screen, unauthorized modifications to `Winlogon` registry keys, and the presence of suspicious executables in `%AppData%` or `%Startup%`. Network IoCs include connections to payment processing portals or C2 servers.
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-WIM | Web Interface Monitoring | Detect | T1491.002 | Deploy automated file integrity monitoring (FIM) and continuous HTTP checksum verification across public web roots. |
D3-RPM | Registry Persistence Monitoring | Detect | T1547.004 | Monitor changes to standard autostart run keys (HKLM\Software\Microsoft\Windows\CurrentVersion\Run) and Startup folders. |
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_FRAUDKRYPT_T1_ARTIFACT {
meta:
description = "Tier 1 Primitive Artifact: Raw string matches for Fraudkrypt"
tier = "T1 - Primitive Artifact"
confidence = "Low-Medium (Fast Triage)"
author = "SystemHelpdesk Threat Research Desk"
date = "2026-10-14"
strings:
$s1 = "fraudkrypt" 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 - Fraudkrypt (Ransomware) Execution & Triage
id: 664d8ca8-1153-5e89-9e63-9397214240b4
status: production
description: Detects execution, defense evasion, and persistence behaviors associated
with the Fraudkrypt 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/fraudkrypt
- 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.t1547_004
- attack.t1486
- attack.t1491_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_FRAUDKRYPT_T3_ATTRIBUTION {
meta:
description = "Tier 3 Attribution Fingerprint: Heuristic detection for Fraudkrypt 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 = "fraudkrypt" 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.
- Attempt to boot the system into Safe Mode with Command Prompt; this often bypasses the Winlogon hooks Fraudkrypt uses to lock the screen.
- If it's merely a screenlocker (Scareware), use `regedit` in Safe Mode to restore the `HKLM\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon\Shell` key back to `explorer.exe`.
- If data is encrypted, check 'No More Ransom' to see if a free decryptor exists for the specific Fraudkrypt variant.
- Run a full offline scan using a bootable AV rescue disk to remove the underlying malware executable.
What to Avoid
Common mistakes during response to this family that can destroy evidence, spread the infection, or worsen recovery.
- Under no circumstances should you pay the fine or ransom; it funds criminal operations and there is no guarantee the system will be unlocked.
- Avoid reinstalling the OS immediately if data is encrypted; you may be able to recover the files if a decryptor becomes available later.
References & External Analysis
- Search "fraudkrypt" on VirusTotal (External Analysis)
- Search "fraudkrypt" on Any.Run (Sandbox Sandbox)
- Search "fraudkrypt" on MalwareBazaar (Malware Samples)
Frequently Asked Questions
What is Fraudkrypt and what threat category does it belong to?
Fraudkrypt 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 Fraudkrypt establish persistence and evade defensive controls?
Fraudkrypt 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 Fraudkrypt compromise?
Security teams responding to Fraudkrypt 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 Fraudkrypt employ during execution?
Fraudkrypt 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 Fraudkrypt, and what is the recommended recovery procedure?
Decryption availability for Fraudkrypt 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 Fraudkrypt from Windows?
Manual removal of Fraudkrypt 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.
What are the main symptoms of a Fraudkrypt infection?
Symptoms of Fraudkrypt 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 Fraudkrypt 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.
Machine-readable
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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.