{
  "author": "ckeller@fusioncybersecurity.us",
  "cat": "YARA Detection in Memory - Linux_Rootkit_Perfctl_ce456896",
  "detect": {
    "event": {
      "PROCESS": {
        "BASE_ADDRESS": 140702707679232,
        "COMMAND_LINE": "\"C:\\Program Files\\Google\\Chrome\\Application\\chrome.exe\" --type=renderer --origin-trial-disabled-features=CanvasTextNg|WebAssemblyCustomDescriptors --no-pre-read-main-dll --video-capture-use-gpu-memory-buffer --lang=en-US --device-scale-factor=1 --num-raster-threads=4 --enable-main-frame-before-activation --renderer-client-id=14 --time-ticks-at-unix-epoch=-1778650562781137 --launch-time-ticks=662722407272 --metrics-shmem-handle=6440,i,3033380613779887171,9612953273376146249,2097152 --field-trial-handle=1840,i,14721997882082697237,17565953179752199364,262144 --variations-seed-version=20260520-010034.817000-production --pseudonymization-salt-handle=1852,i,1500347570457865890,14850521695523415177,4 --trace-process-track-uuid=3190708999430457380 --mojo-platform-channel-handle=6420 /prefetch:1",
        "FILE_PATH": "C:\\Program Files\\Google\\Chrome\\Application\\chrome.exe",
        "MEMORY_USAGE": 1157664768,
        "PARENT_PROCESS_ID": 65056,
        "PROCESS_ID": 64136,
        "THREADS": 27,
        "USER_NAME": "DESKTOP-ATSEPSK\\Joy Howell"
      },
      "PROCESS_ID": 64136,
      "RULE_NAME": "Linux_Rootkit_Perfctl_ce456896"
    },
    "routing": {
      "arch": 2,
      "did": "",
      "event_id": "eee88dc4-8a27-40d2-814d-4acfd6055447",
      "event_time": 1779451626855,
      "event_type": "YARA_DETECTION",
      "ext_ip": "23.128.32.10",
      "hostname": "desktop-atsepsk",
      "iid": "b2cd59fc-d09d-49e0-a9f2-1fd79ee9c175",
      "int_ip": "192.168.50.200",
      "latency": 222,
      "moduleid": 2,
      "oid": "d3541070-8b0e-4663-8a6a-aa0727aacd36",
      "parent": "18f13f52bf980409168b3f1f6a0e2a86",
      "plat": 268435456,
      "sid": "8f3a47be-5629-4c66-921d-17c39ed07e87",
      "tags": [
        "fusion-soc-alert",
        "fusion-soc-case",
        "fusion-soc-pulled",
        "fusion-soc-triage",
        "fusionsoc-critical",
        "fusionsoc-high",
        "fusionsoc-investigated",
        "joys",
        "windows",
        "yara_detection_memory"
      ],
      "this": "78a6eee0c14aa7287a7de5426a1046ea"
    }
  },
  "detect_id": "e7e20d51-ce25-43cb-8087-1ff06a1046eb",
  "gen_time": 1779451627077,
  "link": "https://app.limacharlie.io/orgs/d3541070-8b0e-4663-8a6a-aa0727aacd36/sensors/8f3a47be-5629-4c66-921d-17c39ed07e87/timeline?time=1779451626\u0026selected=78a6eee0c14aa7287a7de5426a1046ea",
  "namespace": "general",
  "routing": {
    "arch": 2,
    "did": "",
    "event_id": "eee88dc4-8a27-40d2-814d-4acfd6055447",
    "event_time": 1779451626855,
    "event_type": "YARA_DETECTION",
    "ext_ip": "23.128.32.10",
    "hostname": "desktop-atsepsk",
    "iid": "b2cd59fc-d09d-49e0-a9f2-1fd79ee9c175",
    "int_ip": "192.168.50.200",
    "latency": 222,
    "moduleid": 2,
    "oid": "d3541070-8b0e-4663-8a6a-aa0727aacd36",
    "parent": "18f13f52bf980409168b3f1f6a0e2a86",
    "plat": 268435456,
    "sid": "8f3a47be-5629-4c66-921d-17c39ed07e87",
    "tags": [
      "fusion-soc-alert",
      "fusion-soc-case",
      "fusion-soc-pulled",
      "fusion-soc-triage",
      "fusionsoc-critical",
      "fusionsoc-high",
      "fusionsoc-investigated",
      "joys",
      "windows",
      "yara_detection_memory"
    ],
    "this": "78a6eee0c14aa7287a7de5426a1046ea"
  },
  "source": "d3541070-8b0e-4663-8a6a-aa0727aacd36.b2cd59fc-d09d-49e0-a9f2-1fd79ee9c175.8f3a47be-5629-4c66-921d-17c39ed07e87.10000000.2",
  "source_rule": "general.YARA Detection in Memory",
  "ts": 1779451627000
}

{
  "confidence": 0.533,
  "false_positive_reason": null,
  "investigation_questions": [],
  "ioc_analysis": "",
  "iocs_extracted": [],
  "mitre_techniques": [],
  "recommended_actions": [
    "Manual analyst review required \u2014 AI models (majority)",
    "Manual review required"
  ],
  "risk_score": 30,
  "severity": "high",
  "summary": "**Vote: MAJORITY (2/3 -\u003e FALSE POSITIVE)**\n\n### \ud83e\udd16 qwen3.5:4b Analysis (Secondary + RAG)\n**Verdict:** false_positive | **Confidence:** 0.8\nThe process detected is a legitimate Chrome renderer process. No suspicious activity was found in the recent process ancestry.\n\n**IOC Analysis:** The FILE_PATH is a legitimate location for Google Chrome executables. The process is not spawning any child processes and no suspicious activity was detected in the recent process ancestry.\n\n---\n\n### \ud83e\udd16 deepseek-r1:16b Analysis (Secondary + RAG)\n**Verdict:** false_positive | **Confidence:** 0.8\nThe detection event is likely a false positive due to the process being a legitimate application running from a known-good location.\n\n**IOC Analysis:** The process chrome.exe is a known legitimate binary running from C:\\Program Files\\Google\\Chrome\\Application, which is a trusted location. The command line arguments do not indicate malicious activity.\n\n---\n\n### \ud83e\udd16 gemma3:4b Analysis (Secondary)\nFailed or timed out.",
  "verdict": "false_positive",
  "voting": {
    "auto_action": "manual_review",
    "mode": "majority",
    "total_models": 3,
    "vote_summary": [
      "qwen3.5:35b: true_positive (medium, 0% confidence)",
      "qwen3.5:4b +RAG: false_positive (low, 80% confidence)",
      "deepseek-r1:16b +RAG: false_positive (low, 80% confidence)"
    ],
    "votes": [
      {
        "confidence": 0.0,
        "model": "qwen3.5:35b",
        "verdict": "true_positive"
      },
      {
        "confidence": 0.8,
        "had_rag": true,
        "model": "qwen3.5:4b",
        "verdict": "false_positive"
      },
      {
        "confidence": 0.8,
        "had_rag": true,
        "model": "deepseek-r1:16b",
        "verdict": "false_positive"
      }
    ],
    "winning_count": 2,
    "winning_verdict": "false_positive"
  }
}