{
  "family": "pyfiledel",
  "sample_count": 4,
  "category": "ransomware",
  "description": "Trojan:Python/Pyfiledel is a highly destructive malware classified as a **Wiper**. Unlike ransomware, which encrypts files with the intention of extorting money for their return, a wiper is designed for pure sabotage. Its sole objective is to permanently delete or corrupt files, rendering the system completely unbootable or permanently destroying valuable intellectual property. The fact that it is written in Python indicates it is often deployed post-exploitation by attackers leveraging Living off the Land (LotL) techniques or pre-installed interpreters.<br><br><b>Understanding Pyfiledel (Wipers)</b><br>To an end-user, a Pyfiledel attack results in a totally destroyed system, often ending in a Blue Screen of Death (BSOD) or a 'Operating System not found' error upon reboot. For an enterprise, wipers are the most severe form of cyberattack, often associated with nation-state actors (like the NotPetya or Shamoon attacks) aiming to cause maximum operational disruption to critical infrastructure or to cover the tracks of a deeper espionage operation.<br><br><b>Execution and Destruction Mechanics</b><br>Pyfiledel is rarely a standalone executable; it is typically a Python script (`.py` or `.pyc`) deployed by an attacker who has already gained administrative access to the network (`T1059.006`). Upon execution, the script bypasses the standard Windows Recycle Bin. It utilizes Python's `os` and `shutil` modules to aggressively traverse the directory structure (`T1083`) and perform permanent deletions (`os.remove()`, `shutil.rmtree()`) (`T1485`). Advanced versions of Pyfiledel-like wipers may not just delete files, but actively overwrite the file contents with zeros or random data (file shredding) to thwart forensic data recovery tools (`T1485`). Furthermore, it may attempt to corrupt the Master Boot Record (MBR) or delete critical system files in `C:\\Windows\\System32` to guarantee the machine cannot be restarted (`T1561.002`).<br><br><b>Indicators of Compromise & Impact</b><br>The impact is catastrophic, irreversible data destruction. Host-based IoCs include EDR alerts for Python executing script files from temporary directories, massive and rapid file deletion events across the filesystem, and the sudden termination of critical system processes leading to system crashes. Because wipers destroy the very logs needed to investigate them, detecting the *initial* intrusion is paramount.",
  "cta": "Published by the SystemHelpdesk team.",
  "aliases": [],
  "enrichment_level": "expert-seo",
  "faq": [
    {
      "@type": "Question",
      "name": "What is Pyfiledel and what threat category does it belong to?",
      "acceptedAnswer": {
        "@type": "Answer",
        "text": "Pyfiledel 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 Pyfiledel establish persistence and evade defensive controls?",
      "acceptedAnswer": {
        "@type": "Answer",
        "text": "Pyfiledel 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 Pyfiledel compromise?",
      "acceptedAnswer": {
        "@type": "Answer",
        "text": "Security teams responding to Pyfiledel 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 Pyfiledel employ during execution?",
      "acceptedAnswer": {
        "@type": "Answer",
        "text": "Pyfiledel 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 Pyfiledel, and what is the recommended recovery procedure?",
      "acceptedAnswer": {
        "@type": "Answer",
        "text": "Decryption availability for Pyfiledel 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": [
    "T1083",
    "T1485",
    "T1059.006",
    "T1561.002"
  ],
  "cisa_advisory": null,
  "last_updated": "2026-06-09",
  "mitre_attack_detail": [
    {
      "id": "T1485",
      "name": "Data Destruction (Permanently deleting/overwriting files)",
      "tactic": "Impact"
    },
    {
      "id": "T1561.002",
      "name": "Disk Wipe: Disk Structure Wipe (Corrupting the MBR/Boot Sector)",
      "tactic": "Impact"
    },
    {
      "id": "T1059.006",
      "name": "Command and Scripting Interpreter: Python",
      "tactic": "Execution"
    },
    {
      "id": "T1083",
      "name": "File and Directory Discovery (Scanning for files to delete)",
      "tactic": "Discovery"
    }
  ],
  "containment_steps": [
    "If a wiper attack is detected in progress, immediately pull the power cords (do NOT perform a graceful shutdown) on critical servers to halt the overwriting process.",
    "Physically isolate the affected network segments to prevent the attacker from deploying the Python script to other subnets.",
    "Initiate disaster recovery protocols to restore systems from secure, offline backups (e.g., tape backups or immutable cloud storage).",
    "Conduct a deep forensic investigation on surviving network appliances (firewalls, proxies) to determine how the attacker gained the administrative access required to deploy the wiper."
  ],
  "what_to_avoid": [
    "Do not assume data can be easily recovered using standard undelete tools; wipers specifically overwrite the data blocks on the hard drive.",
    "Avoid restoring backups to the same network environment without first identifying and closing the initial breach vector, or the attacker will simply wipe the restored servers."
  ],
  "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"
  ]
}