{
  "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": "d77ede1c-a2b2-4dbc-b6e2-64f1f54ff96f",
            "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": 35031,
            "moduleid": 2,
            "oid": "ad19afae-3759-4207-b06e-8648b225c455",
            "parent": "5aac4ac94a5899870505a72a69badbc5",
            "plat": 268435456,
            "sid": "e4a1c62d-4d1f-4472-bae4-43291246b4d4",
            "tags": [
              "domain-controller"
            ],
            "this": "990b174edf869fdf7e114b4269badbc5"
          }
        },
        {
          "event": {
            "ACCESS_FLAGS": 5136,
            "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": "e51ebc6c-cff3-4332-b721-cd46f153a508",
            "event_time": 1773853671397,
            "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": 932,
            "moduleid": 2,
            "oid": "ad19afae-3759-4207-b06e-8648b225c455",
            "parent": "fc5d0530662c070c4e8dbb9b69badbc5",
            "plat": 268435456,
            "sid": "e4a1c62d-4d1f-4472-bae4-43291246b4d4",
            "tags": [
              "domain-controller"
            ],
            "target": "990b174edf869fdf7e114b4269badbc5",
            "this": "a007427be5f6784eefba3fde69badbe8"
          }
        }
      ]
    },
    "routing": {
      "arch": 2,
      "did": "",
      "event_id": "bb4a8232-2da6-4b43-81b3-25ddc2c3c662",
      "event_time": 1773853672281,
      "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": 48,
      "moduleid": 2,
      "oid": "ad19afae-3759-4207-b06e-8648b225c455",
      "parent": "fc5d0530662c070c4e8dbb9b69badbc5",
      "plat": 268435456,
      "sid": "e4a1c62d-4d1f-4472-bae4-43291246b4d4",
      "tags": [
        "domain-controller"
      ],
      "target": "990b174edf869fdf7e114b4269badbc5",
      "this": "7e8c8c4f77b99ab3ca51a66969badbe8"
    }
  },
  "detect_id": "84fe6fd8-b571-4f1a-9ac6-a35169badbe8",
  "gen_time": 1773853672329,
  "link": "https://app.limacharlie.io/orgs/ad19afae-3759-4207-b06e-8648b225c455/sensors/e4a1c62d-4d1f-4472-bae4-43291246b4d4/timeline?time=1773853672\u0026selected=7e8c8c4f77b99ab3ca51a66969badbe8",
  "namespace": "general",
  "routing": {
    "arch": 2,
    "did": "",
    "event_id": "bb4a8232-2da6-4b43-81b3-25ddc2c3c662",
    "event_time": 1773853672281,
    "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": 48,
    "moduleid": 2,
    "oid": "ad19afae-3759-4207-b06e-8648b225c455",
    "parent": "fc5d0530662c070c4e8dbb9b69badbc5",
    "plat": 268435456,
    "sid": "e4a1c62d-4d1f-4472-bae4-43291246b4d4",
    "tags": [
      "domain-controller"
    ],
    "target": "990b174edf869fdf7e114b4269badbc5",
    "this": "7e8c8c4f77b99ab3ca51a66969badbe8"
  },
  "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": 1773853672000
}

{
  "confidence": 0.877,
  "false_positive_reason": "Legitimate system binary running in expected context",
  "investigation_questions": [
    "Which specific source process initiated the access to LSASS?"
  ],
  "ioc_analysis": "The identified IOCs (lsass.exe and wininit.exe) are legitimate Windows system components. Their file paths, signature status, and parent-child relationship are consistent with a standard, non-compromised Windows environment.",
  "iocs_extracted": [
    "bbc83e4759d4b82bad31e371ad679aa414c72273bf97cee5aed8337ed8a4d79f",
    "13ad43ee6d19dfc9709c3106d796bc3f21791a564e443d042a5aa117f2680649",
    "C:\\Windows\\system32\\lsass.exe"
  ],
  "mitre_techniques": [
    "T1003"
  ],
  "recommended_actions": [
    "Close case as false positive (unanimous AI verdict)",
    "Close as False Positive",
    "Tune the detection rule to exclude legitimate system processes accessing LSASS memory"
  ],
  "risk_score": 8,
  "severity": "informational",
  "summary": "**Vote: UNANIMOUS (3/3 -\u003e FALSE POSITIVE)**\n\n### \u264a gemini-cli Analysis (Primary)\n**Verdict:** false_positive | **Confidence:** 0.98\nThis detection is a false positive involving legitimate access to the LSASS process. The target process is a verified Microsoft-signed binary running from the standard System32 directory, spawned by its expected parent process (wininit.exe), and historical analyst feedback consistently marks this rule as prone to false positives.\n\n**IOC Analysis:** The identified IOCs (lsass.exe and wininit.exe) are legitimate Windows system components. Their file paths, signature status, and parent-child relationship are consistent with a standard, non-compromised Windows environment.\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 Windows system binary running from its expected location in System32 with valid Microsoft signature. Historical analyst feedback consistently marks this rule as false positive for legitimate system processes.\n\n**IOC Analysis:** lsass.exe is a critical Windows system process responsible for authentication and security. The event shows it running from C:\\Windows\\system32\\ (expected location), has a valid file hash matching known Microsoft binaries, and is signed. It was spawned by wininit.exe which is also a legitimate system process.\n\n---\n\n### \ud83e\udd16 deepseek-r1:8b Analysis (Secondary)\n**Verdict:** false_positive | **Confidence:** 0.7\nThe event involves access to lsass.exe, a legitimate Windows system binary located in C:\\Windows\\system32. Given the system account context and historical analyst feedback indicating frequent false positives for this rule, this is likely a benign system process access.\n\n**IOC Analysis:** The FILE_PATH C:\\Windows\\system32\\lsass.exe is a known Windows system binary running from its expected directory, and the HASH is for a signed binary. However, based on historical feedback showing this rule often flags legitimate system processes, it is considered a false positive.",
  "verdict": "false_positive",
  "voting": {
    "auto_action": "auto_close_fp",
    "mode": "unanimous",
    "total_models": 3,
    "vote_summary": [
      "gemini-cli: false_positive (informational, 98% confidence)",
      "qwen3.5:4b: false_positive (informational, 95% confidence)",
      "deepseek-r1:8b: false_positive (low, 70% confidence)"
    ],
    "votes": [
      {
        "confidence": 0.98,
        "model": "gemini-cli",
        "verdict": "false_positive"
      },
      {
        "confidence": 0.95,
        "model": "qwen3.5:4b",
        "verdict": "false_positive"
      },
      {
        "confidence": 0.7,
        "model": "deepseek-r1:8b",
        "verdict": "false_positive"
      }
    ],
    "winning_count": 3,
    "winning_verdict": "false_positive"
  }
}