{
  "family": "comine",
  "sample_count": 1,
  "category": "trojan",
  "description": "Coinminer:Win32/Comine (or Trojan:Win32/Comine) is a malicious cryptomining application designed to silently hijack the CPU and GPU resources of infected systems. Its sole purpose is to generate cryptocurrency (most commonly Monero) for the attacker, operating entirely in the background without the victim's knowledge or consent (`T1496`).<br><br><b>Understanding Comine (Cryptominers)</b><br>To an end-user, a Comine infection manifests as severe system sluggishness. The computer's fans may spin loudly even when idle, the battery drains rapidly, and applications take unusually long to load. For an IT department, cryptominers are a significant drain on corporate resources, increasing electricity costs, shortening hardware lifespans due to thermal stress, and disrupting business operations due to resource starvation.<br><br><b>Execution and Resource Hijacking</b><br>Comine is often distributed via exploit kits, dropped by other malware (like botnets or downloaders), or bundled with pirated software. Upon execution, it establishes persistence, often via Scheduled Tasks or WMI event subscriptions. It drops the mining binary (often a modified, obfuscated version of XMRig). To evade detection, it often uses Process Hollowing (`T1055.012`), injecting the mining code into a legitimate process like `notepad.exe` or `svchost.exe`. It may also monitor Task Manager (`taskmgr.exe`) and temporarily pause mining when the user opens it, attempting to hide the CPU spike (`T1562.001`).<br><br><b>Indicators of Compromise & Impact</b><br>The impact is primarily financial (electricity costs) and operational (hardware degradation). Host-based IoCs include persistent 90-100% CPU/GPU utilization by seemingly legitimate processes, rapid battery drain, and EDR alerts for process injection. Network IoCs are highly distinct: continuous outbound connections using the Stratum protocol (often over ports 3333, 4444, or 8080) communicating with known cryptocurrency mining pools.",
  "cta": "Published by the SystemHelpdesk team.",
  "aliases": [],
  "enrichment_level": "expert-seo",
  "faq": [
    {
      "@type": "Question",
      "name": "What is Comine and what threat category does it belong to?",
      "acceptedAnswer": {
        "@type": "Answer",
        "text": "Comine is classified as a Trojan. 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 Comine establish persistence and evade defensive controls?",
      "acceptedAnswer": {
        "@type": "Answer",
        "text": "Comine 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 Comine compromise?",
      "acceptedAnswer": {
        "@type": "Answer",
        "text": "Security teams responding to Comine 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 secondary payloads and staging behaviors are commonly associated with Comine?",
      "acceptedAnswer": {
        "@type": "Answer",
        "text": "Comine frequently operates as a loader or dropper designed to establish a foothold before downloading and executing secondary high-impact malware payloads. Depending on the threat actor's objectives, these dropped modules can range from ransomware and banking injects to modular infostealers and remote management backdoors."
      }
    },
    {
      "@type": "Question",
      "name": "How can security operations teams effectively detect and hunt for Comine across enterprise endpoints?",
      "acceptedAnswer": {
        "@type": "Answer",
        "text": "Defenders should hunt for Comine by deploying behavioral endpoint detection and response (EDR) rules that monitor suspicious process spawning (such as cmd.exe or powershell.exe spawned from office documents or temporary directories), anomalous outbound network connections from non-browser binaries, and unauthorized modifications to Windows Run keys and scheduled task registries."
      }
    }
  ],
  "faq_count": 5,
  "mitre_attack": [
    "T1496",
    "T1562.001",
    "T1055.012"
  ],
  "cisa_advisory": null,
  "last_updated": "2026-06-09",
  "mitre_attack_detail": [
    {
      "id": "T1496",
      "name": "Resource Hijacking (The core function of stealing CPU/GPU cycles for mining)",
      "tactic": "Impact"
    },
    {
      "id": "T1055.012",
      "name": "Process Injection: Process Hollowing (Hiding the miner inside legitimate Windows processes)",
      "tactic": "Defense Evasion"
    },
    {
      "id": "T1562.001",
      "name": "Impair Defenses: Disable or Modify Tools (Pausing execution when Task Manager is opened)",
      "tactic": "Defense Evasion"
    }
  ],
  "containment_steps": [
    "Isolate the infected machine; while the miner itself just steals resources, it was likely dropped by a more dangerous backdoor that still provides access.",
    "Use EDR or Process Explorer to identify the specific process consuming the CPU cycles and terminate it.",
    "Analyze network logs to identify the mining pool IP addresses and block them at the perimeter firewall to neutralize the attacker's monetization.",
    "Audit the system for hidden persistence mechanisms, particularly WMI event subscriptions or obscure Scheduled Tasks."
  ],
  "what_to_avoid": [
    "Do not assume the threat is minor; the presence of a miner proves that an attacker had arbitrary code execution capabilities on that machine.",
    "Avoid relying solely on Task Manager to spot the miner, as advanced variants actively hide from it."
  ],
  "target_industries": [
    "Global / Opportunistic"
  ],
  "motivation": "Opportunistic",
  "threat_actors": [
    "Unknown / Cybercriminal"
  ],
  "target_geographies": [
    "Global"
  ],
  "attack_stage": [
    "execution",
    "persistence"
  ],
  "ecosystem": [
    "windows_pe"
  ],
  "is_emerging": false,
  "target_platforms": [
    "Windows 11",
    "Windows 10",
    "Windows 7"
  ]
}