{
  "family": "zombieboy",
  "sample_count": 2,
  "category": "ransomware",
  "description": "Trojan:Win32/Zombieboy is a highly aggressive, self-propagating cryptomining botnet (Worm) that emerged prominently around 2018. It is infamous for rapidly spreading across enterprise networks by aggressively weaponizing a suite of leaked NSA exploits—most notably EternalBlue (`T1210`) and DoublePulsar. Its primary objective is not data theft or ransomware, but rather to forcibly co-opt the CPU resources of infected machines to mine Monero (XMR) cryptocurrency (`T1496`).<br><br><b>Understanding Zombieboy (Cryptomining Worms)</b><br>To an end-user, a Zombieboy infection manifests as severe, unexplained system sluggishness and high CPU temperatures. For a security operations center (SOC), Zombieboy is a 'noisy' but critical threat. While cryptomining is less destructive than ransomware, the fact that Zombieboy successfully exploited a machine indicates a severe vulnerability management failure; the same vector could easily be used to deploy ransomware.<br><br><b>Execution and Propagation Mechanics</b><br>Zombieboy is primarily a network worm. Once a single machine on a network is infected (often via phishing or an exposed vulnerability), the bot immediately begins scanning the internal subnet (`T1046`) for port 445 (SMB). When it finds an unpatched machine, it fires the EternalBlue exploit (`T1210`) to gain SYSTEM-level access, subsequently using the DoublePulsar backdoor to install itself. It establishes persistence via WMI event subscriptions (`T1546.003`) or scheduled tasks. It then drops an open-source XMRig miner (often renamed), configures it to point to a mining pool, and begins monopolizing the CPU (`T1496`). To maintain dominance, it often attempts to kill competing cryptominers on the host.<br><br><b>Indicators of Compromise & Impact</b><br>The primary impact is massive resource exhaustion and the realization of unpatched critical vulnerabilities. Host-based IoCs include the presence of `XMRig.exe` or heavily obfuscated binaries consuming 90%+ CPU in Task Manager, and the creation of anomalous WMI Event Consumers. Network IoCs are highly prominent: massive spikes in internal port 445 (SMB) scanning traffic originating from standard workstations, and outbound connections to known Stratum mining pool IP addresses over ports like 3333, 4444, or 8080.",
  "cta": "Published by the SystemHelpdesk team.",
  "aliases": [],
  "enrichment_level": "expert-seo",
  "faq": [
    {
      "@type": "Question",
      "name": "What is Zombieboy and what threat category does it belong to?",
      "acceptedAnswer": {
        "@type": "Answer",
        "text": "Zombieboy 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 Zombieboy establish persistence and evade defensive controls?",
      "acceptedAnswer": {
        "@type": "Answer",
        "text": "Zombieboy 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 Zombieboy compromise?",
      "acceptedAnswer": {
        "@type": "Answer",
        "text": "Security teams responding to Zombieboy 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 Zombieboy employ during execution?",
      "acceptedAnswer": {
        "@type": "Answer",
        "text": "Zombieboy 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 Zombieboy, and what is the recommended recovery procedure?",
      "acceptedAnswer": {
        "@type": "Answer",
        "text": "Decryption availability for Zombieboy 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": [
    "T1210",
    "T1496",
    "T1046",
    "T1546.003"
  ],
  "cisa_advisory": null,
  "last_updated": "2026-06-09",
  "mitre_attack_detail": [
    {
      "id": "T1496",
      "name": "Resource Hijacking (The primary payload: Monero cryptomining)",
      "tactic": "Impact"
    },
    {
      "id": "T1210",
      "name": "Exploitation of Remote Services (Using EternalBlue for worm-like propagation)",
      "tactic": "Lateral Movement"
    },
    {
      "id": "T1046",
      "name": "Network Service Discovery (Scanning the local subnet for port 445)",
      "tactic": "Discovery"
    },
    {
      "id": "T1546.003",
      "name": "Event Triggered Execution: Windows Management Instrumentation Event Subscription (Persistence mechanism)",
      "tactic": "Persistence"
    }
  ],
  "containment_steps": [
    "Immediately apply Microsoft security patch MS17-010 (addressing the EternalBlue SMBv1 vulnerability) to ALL systems on the network.",
    "Isolate infected machines to stop the internal scanning and propagation.",
    "Block outbound connections to known cryptomining pools at the perimeter firewall (often using the Stratum protocol).",
    "Hunt for and remove the WMI event subscriptions and dropped XMRig binaries used by the malware for persistence."
  ],
  "what_to_avoid": [
    "Do not treat cryptomining as a 'low priority' alert; a worm moving via EternalBlue means your network is fully exposed to more severe threats.",
    "Avoid simply killing the high-CPU process; the WMI persistence mechanism will restart it immediately."
  ],
  "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"
  ]
}