{
  "author": "ckeller@fusioncybersecurity.us",
  "cat": "Sensitive Process Accessed",
  "detect": {
    "event": {
      "EVENTS": [
        {
          "event": {
            "BASE_ADDRESS": 140695720558592,
            "COMMAND_LINE": "C:\\Windows\\system32\\lsass.exe",
            "CREATION_TIME": 1773849971454,
            "FILE_IS_SIGNED": 1,
            "FILE_PATH": "C:\\Windows\\system32\\lsass.exe",
            "HASH": "bbc83e4759d4b82bad31e371ad679aa414c72273bf97cee5aed8337ed8a4d79f",
            "MEMORY_USAGE": 75264000,
            "PARENT": {
              "FILE_IS_SIGNED": 1,
              "FILE_PATH": "\\Device\\HarddiskVolume4\\Windows\\System32\\wininit.exe",
              "HASH": "13ad43ee6d19dfc9709c3106d796bc3f21791a564e443d042a5aa117f2680649",
              "MEMORY_USAGE": 6987776,
              "PARENT_PROCESS_ID": 420,
              "PROCESS_ID": 536,
              "THIS_ATOM": "5aac4ac94a5899870505a72a69badbc5",
              "THREADS": 5,
              "TIMESTAMP": 1773853637283,
              "USER_NAME": "NT AUTHORITY\\SYSTEM"
            },
            "PARENT_PROCESS_ID": 536,
            "PROCESS_ID": 632,
            "THREADS": 46,
            "USER_NAME": "NT AUTHORITY\\SYSTEM"
          },
          "routing": {
            "arch": 2,
            "did": "",
            "event_id": "b0e4f956-4bcc-47a4-a01c-0f1742dfc2f2",
            "event_time": 1773853637298,
            "event_type": "EXISTING_PROCESS",
            "ext_ip": "67.60.122.240",
            "hostname": "df-labsdc01.dflabs.local",
            "iid": "47501359-645e-4049-906e-e6195da7afcf",
            "int_ip": "192.168.45.129",
            "latency": 875816,
            "moduleid": 2,
            "oid": "ad19afae-3759-4207-b06e-8648b225c455",
            "parent": "5aac4ac94a5899870505a72a69badbc5",
            "plat": 268435456,
            "sid": "e4a1c62d-4d1f-4472-bae4-43291246b4d4",
            "tags": [
              "domain-controller",
              "fusion-soc-pulled",
              "fusion-soc-triage",
              "fusion-soc-case"
            ],
            "this": "990b174edf869fdf7e114b4269badbc5"
          }
        },
        {
          "event": {
            "ACCESS_FLAGS": 1052689,
            "PARENT_PROCESS_ID": 3324,
            "PROCESS_ID": 632,
            "SOURCE": {
              "FILE_IS_SIGNED": 1,
              "FILE_PATH": "\\Device\\HarddiskVolume4\\Program Files\\Elastic\\Endpoint\\elastic-endpoint.exe",
              "HASH": "4d4f913d46f799582eac75707424f84ce7107e96cac55ddd454f4e554fdd24b1",
              "MEMORY_USAGE": 65019904,
              "PARENT_ATOM": "5121f09ae4602c114b78252569badbc5",
              "PARENT_PROCESS_ID": 608,
              "PROCESS_ID": 3324,
              "THIS_ATOM": "fc5d0530662c070c4e8dbb9b69badbc5",
              "THREADS": 101,
              "TIMESTAMP": 1773853637475,
              "USER_NAME": "NT AUTHORITY\\SYSTEM"
            },
            "TARGET": {
              "BASE_ADDRESS": 140695720558592,
              "COMMAND_LINE": "C:\\Windows\\system32\\lsass.exe",
              "CREATION_TIME": 1773849971454,
              "FILE_IS_SIGNED": 1,
              "FILE_PATH": "C:\\Windows\\system32\\lsass.exe",
              "HASH": "bbc83e4759d4b82bad31e371ad679aa414c72273bf97cee5aed8337ed8a4d79f",
              "MEMORY_USAGE": 75264000,
              "PARENT_ATOM": "5aac4ac94a5899870505a72a69badbc5",
              "PARENT_PROCESS_ID": 536,
              "PROCESS_ID": 632,
              "THIS_ATOM": "990b174edf869fdf7e114b4269badbc5",
              "THREADS": 46,
              "TIMESTAMP": 1773853637298,
              "USER_NAME": "NT AUTHORITY\\SYSTEM"
            }
          },
          "routing": {
            "arch": 2,
            "did": "",
            "event_id": "1c81529f-6772-4fe5-911c-df5b15b3224e",
            "event_time": 1773854512779,
            "event_type": "REMOTE_PROCESS_HANDLE",
            "ext_ip": "67.60.122.240",
            "hostname": "df-labsdc01.dflabs.local",
            "iid": "47501359-645e-4049-906e-e6195da7afcf",
            "int_ip": "192.168.45.129",
            "latency": 335,
            "moduleid": 2,
            "oid": "ad19afae-3759-4207-b06e-8648b225c455",
            "parent": "fc5d0530662c070c4e8dbb9b69badbc5",
            "plat": 268435456,
            "sid": "e4a1c62d-4d1f-4472-bae4-43291246b4d4",
            "tags": [
              "domain-controller",
              "fusion-soc-pulled",
              "fusion-soc-triage",
              "fusion-soc-case"
            ],
            "target": "990b174edf869fdf7e114b4269badbc5",
            "this": "e292ebe1a87f87ff044e17ef69badf30"
          }
        }
      ]
    },
    "routing": {
      "arch": 2,
      "did": "",
      "event_id": "53313ce6-d4bc-4e3b-aa2a-ed46325faadd",
      "event_time": 1773854512810,
      "event_type": "SENSITIVE_PROCESS_ACCESS",
      "ext_ip": "67.60.122.240",
      "hostname": "df-labsdc01.dflabs.local",
      "iid": "47501359-645e-4049-906e-e6195da7afcf",
      "int_ip": "192.168.45.129",
      "latency": 304,
      "moduleid": 2,
      "oid": "ad19afae-3759-4207-b06e-8648b225c455",
      "parent": "fc5d0530662c070c4e8dbb9b69badbc5",
      "plat": 268435456,
      "sid": "e4a1c62d-4d1f-4472-bae4-43291246b4d4",
      "tags": [
        "domain-controller",
        "fusion-soc-pulled",
        "fusion-soc-triage",
        "fusion-soc-case"
      ],
      "target": "990b174edf869fdf7e114b4269badbc5",
      "this": "cbe90c97c860344b24efd21a69badf30"
    }
  },
  "detect_id": "223b1948-cf85-4a4a-959a-451569badf31",
  "gen_time": 1773854513259,
  "link": "https://app.limacharlie.io/orgs/ad19afae-3759-4207-b06e-8648b225c455/sensors/e4a1c62d-4d1f-4472-bae4-43291246b4d4/timeline?time=1773854512\u0026selected=cbe90c97c860344b24efd21a69badf30",
  "namespace": "general",
  "routing": {
    "arch": 2,
    "did": "",
    "event_id": "53313ce6-d4bc-4e3b-aa2a-ed46325faadd",
    "event_time": 1773854512810,
    "event_type": "SENSITIVE_PROCESS_ACCESS",
    "ext_ip": "67.60.122.240",
    "hostname": "df-labsdc01.dflabs.local",
    "iid": "47501359-645e-4049-906e-e6195da7afcf",
    "int_ip": "192.168.45.129",
    "latency": 304,
    "moduleid": 2,
    "oid": "ad19afae-3759-4207-b06e-8648b225c455",
    "parent": "fc5d0530662c070c4e8dbb9b69badbc5",
    "plat": 268435456,
    "sid": "e4a1c62d-4d1f-4472-bae4-43291246b4d4",
    "tags": [
      "domain-controller",
      "fusion-soc-pulled",
      "fusion-soc-triage",
      "fusion-soc-case"
    ],
    "target": "990b174edf869fdf7e114b4269badbc5",
    "this": "cbe90c97c860344b24efd21a69badf30"
  },
  "source": "ad19afae-3759-4207-b06e-8648b225c455.47501359-645e-4049-906e-e6195da7afcf.e4a1c62d-4d1f-4472-bae4-43291246b4d4.10000000.2",
  "source_rule": "general.Sensitive Process Accessed",
  "ts": 1773854515000
}

{
  "confidence": 0.96,
  "false_positive_reason": "Legitimate system process behavior",
  "investigation_questions": [
    "Is there any evidence of unauthorized memory reading tools (e.g., Mimikatz) being executed on the host?"
  ],
  "ioc_analysis": "The process C:\\Windows\\system32\\lsass.exe is a known Windows system binary. Both lsass.exe and its parent wininit.exe are located in the correct System32 directory and are reported as signed, indicating they are legitimate Microsoft binaries.",
  "iocs_extracted": [
    "C:\\Windows\\system32\\lsass.exe",
    "bbc83e4759d4b82bad31e371ad679aa414c72273bf97cee5aed8337ed8a4d79f",
    "C:\\Windows\\System32\\wininit.exe",
    "13ad43ee6d19dfc9709c3106d796bc3f21791a564e443d042a5aa117f2680649"
  ],
  "mitre_techniques": [
    "T1003"
  ],
  "recommended_actions": [
    "Manual analyst review required \u2014 AI models (majority)",
    "No action required.",
    "Consider tuning the rule to exclude baseline system process interactions with lsass.exe."
  ],
  "risk_score": 8,
  "severity": "high",
  "summary": "**Vote: MAJORITY (2/3 -\u003e FALSE POSITIVE)**\n\n### \u264a gemini-cli Analysis (Primary)\n**Verdict:** false_positive | **Confidence:** 0.98\nThe detection triggered on a sensitive process access event involving lsass.exe. Analysis confirms that lsass.exe is running from its legitimate system directory, is properly signed, and was spawned by wininit.exe, which is the expected behavior for a Windows system boot.\n\n**IOC Analysis:** The process C:\\Windows\\system32\\lsass.exe is a known Windows system binary. Both lsass.exe and its parent wininit.exe are located in the correct System32 directory and are reported as signed, indicating they are legitimate Microsoft binaries.\n\n---\n\n### \ud83e\udd16 qwen3.5:4b Analysis (Secondary)\n**Verdict:** false_positive | **Confidence:** 0.95\nThe detection flagged lsass.exe access, but the process is a known Microsoft-signed system binary running from its expected location in System32 under SYSTEM user context. Historical analyst feedback consistently marks similar events as false positives.\n\n**IOC Analysis:** lsass.exe is a legitimate Windows system process responsible for security authentication and Kerberos services. The file path matches the expected location (C:\\Windows\\system32\\), the binary is signed, and it is running under NT AUTHORITY\\SYSTEM with wininit.exe as parent, which is normal boot behavior.\n\n---\n\n### \ud83e\udd16 deepseek-r1:8b Analysis (Secondary)\n**Verdict:** benign | **Confidence:** 0.95\nThe detection event involves access to lsass.exe, a legitimate Windows system binary located in C:\\Windows\\System32. It is signed and part of normal system operations, indicating no malicious activity.\n\n**IOC Analysis:** The FILE_PATH is a known legitimate Windows binary in the expected directory (C:\\Windows\\System32). The hash matches a Microsoft-signed binary, and the process is running with SYSTEM privileges, which is typical for system binaries. The parent process, wininit.exe, is also a legitimate system binary, confirming the context is benign.",
  "verdict": "false_positive",
  "voting": {
    "auto_action": "manual_review",
    "mode": "majority",
    "total_models": 3,
    "vote_summary": [
      "gemini-cli: false_positive (informational, 98% confidence)",
      "qwen3.5:4b: false_positive (informational, 95% confidence)",
      "deepseek-r1:8b: benign (informational, 95% confidence)"
    ],
    "votes": [
      {
        "confidence": 0.98,
        "model": "gemini-cli",
        "verdict": "false_positive"
      },
      {
        "confidence": 0.95,
        "model": "qwen3.5:4b",
        "verdict": "false_positive"
      },
      {
        "confidence": 0.95,
        "model": "deepseek-r1:8b",
        "verdict": "benign"
      }
    ],
    "winning_count": 2,
    "winning_verdict": "false_positive"
  }
}