{
  "family": "filepatch",
  "sample_count": 2,
  "category": "ransomware",
  "description": "Riskware:Win32/Filepatch is a highly generic heuristic detection used by antivirus engines to flag software 'cracks', 'patchers', or 'keygens'. These tools are designed to illegally bypass the digital rights management (DRM) or licensing mechanisms of commercial software. While the patcher itself might successfully crack the software, it is a primary vector for malware distribution; threat actors heavily bundle devastating payloads (ransomware, info-stealers) alongside these illegal tools.<br><br><b>Understanding Filepatch (Software Cracks)</b><br>To an end-user, a Filepatch tool is a way to get expensive software for free. For a security administrator, it represents a severe policy violation and a critical security incident. The user is deliberately bypassing security controls, often running unknown executables with Administrator privileges and actively disabling their antivirus to allow the 'crack' to work (`T1562.001`).<br><br><b>Execution and Risk Mechanics</b><br>These tools are downloaded from underground forums or torrent sites. Upon execution, the patcher modifies the memory or the on-disk executable of the targeted commercial software (`T1574.001`) to bypass license checks. However, because the user is already granting the tool deep system access, bundled malware (like a silent coin-miner or a backdoor RAT) is simultaneously installed in the background. The 'Filepatch' detection flags the behavior of tampering with other executables or the known signatures of popular cracking frameworks.<br><br><b>Indicators of Compromise & Impact</b><br>The primary impact is the high probability of a secondary, severe malware infection, alongside the legal/compliance risks of software piracy. Host-based IoCs include EDR alerts for 'Suspicious File Modification' targeting program files in `C:\\Program Files`, the presence of files named `crack.exe`, `patch.exe`, or `keygen.exe` in the user's Downloads folder, and event logs showing the local Antivirus being temporarily disabled.",
  "cta": "Published by the SystemHelpdesk team.",
  "aliases": [],
  "enrichment_level": "expert-seo",
  "faq": [
    {
      "@type": "Question",
      "name": "What is Filepatch and what threat category does it belong to?",
      "acceptedAnswer": {
        "@type": "Answer",
        "text": "Filepatch 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."
      }
    },
    {
      "@type": "Question",
      "name": "How does Filepatch establish persistence and evade defensive controls?",
      "acceptedAnswer": {
        "@type": "Answer",
        "text": "Filepatch 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."
      }
    },
    {
      "@type": "Question",
      "name": "What are the essential incident response steps for mitigating a Filepatch compromise?",
      "acceptedAnswer": {
        "@type": "Answer",
        "text": "Security teams responding to Filepatch 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."
      }
    },
    {
      "@type": "Question",
      "name": "What cryptographic algorithms and file targeting techniques does Filepatch employ during execution?",
      "acceptedAnswer": {
        "@type": "Answer",
        "text": "Filepatch 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."
      }
    },
    {
      "@type": "Question",
      "name": "Are decryptors available for Filepatch, and what is the recommended recovery procedure?",
      "acceptedAnswer": {
        "@type": "Answer",
        "text": "Decryption availability for Filepatch 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."
      }
    }
  ],
  "faq_count": 5,
  "mitre_attack": [
    "T1574.001",
    "T1204.002",
    "T1562.001"
  ],
  "cisa_advisory": null,
  "last_updated": "2026-06-09",
  "mitre_attack_detail": [
    {
      "id": "T1562.001",
      "name": "Impair Defenses: Disable or Modify Tools (Users disabling AV to run the crack)",
      "tactic": "Defense Evasion"
    },
    {
      "id": "T1574.001",
      "name": "Hijack Execution Flow: Search Order Hijacking (Modifying legitimate software to bypass DRM)",
      "tactic": "Defense Evasion"
    },
    {
      "id": "T1204.002",
      "name": "User Execution: Malicious File (The user intentionally running the tool)",
      "tactic": "Execution"
    }
  ],
  "containment_steps": [
    "Isolate the machine; assume that executing the software crack also silently installed a secondary, severe malware payload.",
    "Uninstall the pirated software and completely remove the cracking tools from the system.",
    "Run a full, deep antivirus scan and analyze EDR telemetry to hunt for any backdoors or persistence mechanisms established during the crack's execution.",
    "Enforce strict Application Control (WDAC/AppLocker) policies to prevent standard users from executing unapproved software."
  ],
  "what_to_avoid": [
    "Do not assume the machine is clean just because the AV flagged and removed the 'patch.exe' file; investigate what else the user ran.",
    "Avoid relying solely on technical controls; this is primarily a user behavior and policy enforcement issue regarding software piracy."
  ],
  "target_industries": [
    "Healthcare",
    "Critical Infrastructure",
    "Enterprise"
  ],
  "motivation": "Financial Extortion",
  "threat_actors": [
    "Unknown / Cybercriminal"
  ],
  "target_geographies": [
    "Global"
  ],
  "attack_stage": [
    "defense_evasion",
    "impact"
  ],
  "ecosystem": [
    "windows_pe"
  ],
  "is_emerging": false,
  "target_platforms": [
    "Windows 11",
    "Windows 10",
    "Windows Server 2022",
    "Windows Server 2019"
  ]
}