{
  "family": "p2pworm",
  "sample_count": 2,
  "category": "ransomware",
  "description": "Worm:Win32/P2pworm is a generic classification for worms that exploit Peer-to-Peer (P2P) file-sharing networks (like BitTorrent, eMule, Kazaa, or Ares) to propagate. Instead of relying on network vulnerabilities or email, these worms disguise themselves as highly desirable content (cracked software, movies, music) and wait for users to actively download and execute them (`T1189`).<br><br><b>Understanding P2pworm (File-Sharing Worms)</b><br>To an end-user, the infection begins immediately after running what they believed was a pirated game or software crack. For a network administrator, P2P worms are a persistent headache caused by users bypassing corporate acceptable use policies. While older networks like LimeWire are dead, this vector remains highly relevant via malicious torrents.<br><br><b>Execution and Propagation Mechanics</b><br>Once a user executes the downloaded file, the worm establishes persistence (Registry Run keys or Scheduled Tasks) and immediately begins its propagation routine. It searches the infected host for the shared folders used by installed P2P clients (e.g., the default download directory for a BitTorrent client). It then copies its own executable into these shared folders, often generating hundreds of copies with dynamically generated names designed to attract clicks (e.g., `Photoshop_Crack_2024.exe`, `Windows_11_Activator.exe`). When other users on the P2P network search for these terms, they download the worm directly from the infected host.<br><br><b>Indicators of Compromise & Impact</b><br>The impact ranges from simple nuisance and network bandwidth consumption to the deployment of secondary payloads like backdoors or ransomware. Host-based IoCs include the sudden appearance of hundreds of small `.exe`, `.scr`, or `.zip` files in the user's 'Downloads' or P2P shared folders. Network IoCs include massive spikes in inbound and outbound P2P traffic on non-standard ports, often circumventing standard HTTP proxies.",
  "cta": "Published by the SystemHelpdesk team.",
  "aliases": [],
  "enrichment_level": "expert-seo",
  "faq": [],
  "faq_count": 0,
  "mitre_attack": [
    "T1547.001",
    "T1036.005",
    "T1189"
  ],
  "cisa_advisory": null,
  "last_updated": "2026-06-09",
  "mitre_attack_detail": [
    {
      "id": "T1189",
      "name": "Drive-by Compromise (Distributing malware via malicious P2P downloads)",
      "tactic": "Initial Access"
    },
    {
      "id": "T1036.005",
      "name": "Masquerading: Match Legitimate Name or Location (Disguising the worm as popular software cracks)",
      "tactic": "Defense Evasion"
    },
    {
      "id": "T1547.001",
      "name": "Boot or Logon Autostart Execution: Registry Run Keys / Startup Folder (Persistence)",
      "tactic": "Persistence"
    }
  ],
  "containment_steps": [
    "Implement stringent Layer 7 firewall rules (Next-Generation Firewalls) to identify and block all P2P application protocols enterprise-wide.",
    "Use EDR to scan user profiles for known P2P client installations (BitTorrent, uTorrent) and remove them according to corporate policy.",
    "Search for and delete the massive repositories of fake files generated by the worm in the user's shared directories.",
    "Investigate if the P2pworm downloaded any secondary payloads, particularly infostealers targeting corporate credentials."
  ],
  "what_to_avoid": [
    "Do not ignore alerts about P2P traffic on the corporate network; it is a primary vector for unvetted, malicious executables.",
    "Avoid relying solely on file names to determine the legitimacy of an executable found in a user's download folder."
  ],
  "target_industries": [
    "Global / Opportunistic"
  ],
  "motivation": "Opportunistic",
  "threat_actors": [
    "Unknown / Cybercriminal"
  ],
  "target_geographies": [
    "Global"
  ]
}