{
  "family": "minerbot",
  "sample_count": 8,
  "category": "ransomware",
  "description": "Trojan:Win32/Minerbot (often a generic detection for **Cryptojacking Botnets**) represents a massive class of malware whose sole purpose is to silently hijack the computing resources (CPU and GPU) of infected endpoints to mine cryptocurrency (most commonly Monero/XMR) for the attacker. While it does not typically steal data, Minerbot infections cause severe physical strain on hardware and massive electricity costs for enterprises.<br><br><b>Understanding Minerbot Cryptojackers</b><br>To an end-user, a Minerbot infection manifests as extreme system sluggishness, loud laptop fans, and battery drain, even when the computer is idle. For a security analyst, it represents a breach of network integrity and a significant financial drain. Unlike ransomware, which announces its presence, Minerbots strive for absolute stealth, aiming to mine indefinitely without detection.<br><br><b>Execution and Mining Mechanics</b><br>Minerbots are distributed via a wide variety of vectors, including malspam (`T1566.001`), exploit kits, and frequently by exploiting unpatched public-facing vulnerabilities (like Apache Log4j or vulnerable web servers) (`T1190`). Upon execution, the malware establishes persistence (often via Scheduled Tasks) (`T1053.005`) and downloads a specialized mining payload, frequently a modified version of the open-source XMRig miner. To evade detection, the malware injects the mining code into legitimate processes like `svchost.exe` or `notepad.exe` (`T1055`). Advanced variants monitor task manager execution; if the user opens Task Manager, the miner temporarily pauses to hide the CPU spike (`T1562.001`). The bot communicates with a mining pool via the Stratum protocol (often over TCP port 3333 or 14444) to receive hashing work and submit completed shares (`T1071`).<br><br><b>Indicators of Compromise & Impact</b><br>The primary impact is resource exhaustion, hardware degradation, and increased operational costs. The most prominent host-based IoC is a sustained 100% CPU or GPU utilization by an unusual or injected process (like `svchost.exe` running under a user context instead of SYSTEM). Network analysts should look for sustained outbound traffic using the Stratum protocol to known cryptocurrency mining pools (e.g., MineXMR, SupportXMR).",
  "cta": "Published by the SystemHelpdesk team.",
  "aliases": [],
  "enrichment_level": "expert-seo",
  "faq": [
    {
      "@type": "Question",
      "name": "What is Minerbot and what threat category does it belong to?",
      "acceptedAnswer": {
        "@type": "Answer",
        "text": "Minerbot 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 Minerbot establish persistence and evade defensive controls?",
      "acceptedAnswer": {
        "@type": "Answer",
        "text": "Minerbot 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 Minerbot compromise?",
      "acceptedAnswer": {
        "@type": "Answer",
        "text": "Security teams responding to Minerbot 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 Minerbot employ during execution?",
      "acceptedAnswer": {
        "@type": "Answer",
        "text": "Minerbot 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 Minerbot, and what is the recommended recovery procedure?",
      "acceptedAnswer": {
        "@type": "Answer",
        "text": "Decryption availability for Minerbot 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": [
    "T1496",
    "T1055",
    "T1190",
    "T1071"
  ],
  "cisa_advisory": null,
  "last_updated": "2026-06-09",
  "mitre_attack_detail": [
    {
      "id": "T1496",
      "name": "Resource Hijacking (Cryptocurrency Mining)",
      "tactic": "Impact"
    },
    {
      "id": "T1055",
      "name": "Process Injection (Hiding the miner in legitimate processes)",
      "tactic": "Defense Evasion"
    },
    {
      "id": "T1071",
      "name": "Application Layer Protocol (Stratum protocol communication with mining pools)",
      "tactic": "Command and Control"
    },
    {
      "id": "T1190",
      "name": "Exploit Public-Facing Application",
      "tactic": "Initial Access"
    }
  ],
  "containment_steps": [
    "Isolate the endpoint to sever the connection to the mining pool, which immediately halts the generation of revenue for the attacker.",
    "Use EDR to identify and terminate the heavily obfuscated or injected process consuming the CPU resources.",
    "Remove the persistence mechanisms (Registry keys or Scheduled Tasks) used to launch the miner.",
    "Block known mining pool domains and standard Stratum protocol ports at the enterprise firewall."
  ],
  "what_to_avoid": [
    "Do not ignore a Minerbot infection just because it isn't ransomware; the vector used to deploy the miner (e.g., an unpatched vulnerability) can easily be used to deploy ransomware next.",
    "Avoid relying solely on CPU monitoring for detection, as advanced miners throttle their usage to stay below alerting thresholds."
  ],
  "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"
  ]
}