{
  "author": "ckeller@fusioncybersecurity.us",
  "cat": "Sensitive Process Accessed",
  "detect": {
    "event": {
      "EVENTS": [
        {
          "event": {
            "BASE_ADDRESS": 140696195563520,
            "COMMAND_LINE": "C:\\Windows\\system32\\lsass.exe",
            "CREATION_TIME": 1774364636776,
            "FILE_IS_SIGNED": 1,
            "FILE_PATH": "C:\\Windows\\system32\\lsass.exe",
            "HASH": "bbc83e4759d4b82bad31e371ad679aa414c72273bf97cee5aed8337ed8a4d79f",
            "MEMORY_USAGE": 59666432,
            "PARENT": {
              "FILE_IS_SIGNED": 1,
              "FILE_PATH": "\\Device\\HarddiskVolume4\\Windows\\System32\\wininit.exe",
              "HASH": "13ad43ee6d19dfc9709c3106d796bc3f21791a564e443d042a5aa117f2680649",
              "MEMORY_USAGE": 7147520,
              "PARENT_PROCESS_ID": 420,
              "PROCESS_ID": 532,
              "THIS_ATOM": "711ae775947218761767ba1169c2a7fc",
              "THREADS": 8,
              "TIMESTAMP": 1774364668826,
              "USER_NAME": "NT AUTHORITY\\SYSTEM"
            },
            "PARENT_PROCESS_ID": 532,
            "PROCESS_ID": 696,
            "THREADS": 44,
            "USER_NAME": "NT AUTHORITY\\SYSTEM"
          },
          "routing": {
            "arch": 2,
            "did": "",
            "event_id": "b52fd3a8-c97d-4bc8-b570-84c5beb53f98",
            "event_time": 1774364668853,
            "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": 613301,
            "moduleid": 2,
            "oid": "ad19afae-3759-4207-b06e-8648b225c455",
            "parent": "711ae775947218761767ba1169c2a7fc",
            "plat": 268435456,
            "sid": "e4a1c62d-4d1f-4472-bae4-43291246b4d4",
            "tags": [
              "domain-controller",
              "fusion-soc-alert",
              "fusion-soc-case",
              "fusion-soc-pulled",
              "fusion-soc-triage"
            ],
            "this": "4b459041c2a60e9a1ca9845469c2a7fc"
          }
        },
        {
          "event": {
            "ACCESS_FLAGS": 5144,
            "PARENT_PROCESS_ID": 3512,
            "PROCESS_ID": 696,
            "SOURCE": {
              "FILE_IS_SIGNED": 1,
              "FILE_PATH": "\\Device\\HarddiskVolume4\\ProgramData\\Microsoft\\Windows Defender\\Platform\\4.18.26010.5-0\\MsMpEng.exe",
              "HASH": "73ebeae74752610c5c2c3e715c19701374e4e6f84fbb1def0625f7d1e9419442",
              "MEMORY_USAGE": 170856448,
              "PARENT_ATOM": "d488a175b4ca0a0ffce8332069c2a7fc",
              "PARENT_PROCESS_ID": 676,
              "PROCESS_ID": 3512,
              "THIS_ATOM": "b284d679afa869d0290598c169c2a7fe",
              "THREADS": 16,
              "TIMESTAMP": 1774364670498,
              "USER_NAME": "NT AUTHORITY\\SYSTEM"
            },
            "TARGET": {
              "BASE_ADDRESS": 140696195563520,
              "COMMAND_LINE": "C:\\Windows\\system32\\lsass.exe",
              "CREATION_TIME": 1774364636776,
              "FILE_IS_SIGNED": 1,
              "FILE_PATH": "C:\\Windows\\system32\\lsass.exe",
              "HASH": "bbc83e4759d4b82bad31e371ad679aa414c72273bf97cee5aed8337ed8a4d79f",
              "MEMORY_USAGE": 59666432,
              "PARENT_ATOM": "711ae775947218761767ba1169c2a7fc",
              "PARENT_PROCESS_ID": 532,
              "PROCESS_ID": 696,
              "THIS_ATOM": "4b459041c2a60e9a1ca9845469c2a7fc",
              "THREADS": 44,
              "TIMESTAMP": 1774364668853,
              "USER_NAME": "NT AUTHORITY\\SYSTEM"
            }
          },
          "routing": {
            "arch": 2,
            "did": "",
            "event_id": "e8dd464e-df12-45c1-abdf-d74571102b17",
            "event_time": 1774365281605,
            "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": 549,
            "moduleid": 2,
            "oid": "ad19afae-3759-4207-b06e-8648b225c455",
            "parent": "b284d679afa869d0290598c169c2a7fe",
            "plat": 268435456,
            "sid": "e4a1c62d-4d1f-4472-bae4-43291246b4d4",
            "tags": [
              "domain-controller",
              "fusion-soc-alert",
              "fusion-soc-case",
              "fusion-soc-pulled",
              "fusion-soc-triage"
            ],
            "target": "4b459041c2a60e9a1ca9845469c2a7fc",
            "this": "3062d3af47d42b513537daf869c2aa62"
          }
        }
      ]
    },
    "routing": {
      "arch": 2,
      "did": "",
      "event_id": "c7b8dd1e-259b-4166-bb73-3a6b7ab9ae4c",
      "event_time": 1774365282376,
      "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": -221,
      "moduleid": 2,
      "oid": "ad19afae-3759-4207-b06e-8648b225c455",
      "parent": "b284d679afa869d0290598c169c2a7fe",
      "plat": 268435456,
      "sid": "e4a1c62d-4d1f-4472-bae4-43291246b4d4",
      "tags": [
        "domain-controller",
        "fusion-soc-alert",
        "fusion-soc-case",
        "fusion-soc-pulled",
        "fusion-soc-triage"
      ],
      "target": "4b459041c2a60e9a1ca9845469c2a7fc",
      "this": "94cbaaff41631310b5e8fcb469c2aa62"
    }
  },
  "detect_id": "f8529fce-0746-4b62-9d69-801569c2aa62",
  "gen_time": 1774365282154,
  "link": "https://app.limacharlie.io/orgs/ad19afae-3759-4207-b06e-8648b225c455/sensors/e4a1c62d-4d1f-4472-bae4-43291246b4d4/timeline?time=1774365282\u0026selected=94cbaaff41631310b5e8fcb469c2aa62",
  "namespace": "general",
  "routing": {
    "arch": 2,
    "did": "",
    "event_id": "c7b8dd1e-259b-4166-bb73-3a6b7ab9ae4c",
    "event_time": 1774365282376,
    "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": -221,
    "moduleid": 2,
    "oid": "ad19afae-3759-4207-b06e-8648b225c455",
    "parent": "b284d679afa869d0290598c169c2a7fe",
    "plat": 268435456,
    "sid": "e4a1c62d-4d1f-4472-bae4-43291246b4d4",
    "tags": [
      "domain-controller",
      "fusion-soc-alert",
      "fusion-soc-case",
      "fusion-soc-pulled",
      "fusion-soc-triage"
    ],
    "target": "4b459041c2a60e9a1ca9845469c2a7fc",
    "this": "94cbaaff41631310b5e8fcb469c2aa62"
  },
  "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": 1774365282000
}

{
  "virustotal": [
    {
      "malicious": false,
      "provider": "virustotal",
      "reputation": 27,
      "stats": {
        "confirmed-timeout": 0,
        "failure": 0,
        "harmless": 0,
        "malicious": 0,
        "suspicious": 0,
        "timeout": 0,
        "type-unsupported": 4,
        "undetected": 71
      }
    },
    {
      "malicious": false,
      "provider": "virustotal",
      "reputation": 17,
      "stats": {
        "confirmed-timeout": 0,
        "failure": 0,
        "harmless": 0,
        "malicious": 0,
        "suspicious": 0,
        "timeout": 0,
        "type-unsupported": 4,
        "undetected": 72
      }
    },
    {
      "malicious": false,
      "provider": "virustotal",
      "reputation": 0,
      "stats": {
        "confirmed-timeout": 0,
        "failure": 1,
        "harmless": 0,
        "malicious": 0,
        "suspicious": 0,
        "timeout": 0,
        "type-unsupported": 4,
        "undetected": 71
      }
    }
  ]
}

{
  "confidence": 0.95,
  "false_positive_reason": "Antivirus/EDR processes scanning files (Windows Defender MsMpEng.exe)",
  "investigation_questions": [
    "Was any other non-system process observed accessing LSASS during this time window?"
  ],
  "ioc_analysis": "Both the source and target processes are legitimate Microsoft-signed binaries. The target is the standard Windows LSASS process (C:\\Windows\\System32\\lsass.exe), and the source is MsMpEng.exe (Windows Defender) running from its expected platform directory in ProgramData. Both hashes are verified as non-malicious.",
  "iocs_extracted": [
    "C:\\Windows\\system32\\lsass.exe",
    "bbc83e4759d4b82bad31e371ad679aa414c72273bf97cee5aed8337ed8a4d79f",
    "MsMpEng.exe",
    "73ebeae74752610c5c2c3e715c19701374e4e6f84fbb1def0625f7d1e9419442"
  ],
  "mitre_techniques": [
    "T1003.001"
  ],
  "recommended_actions": [
    "Close case as false positive (unanimous AI verdict)",
    "Close this alert as a false positive",
    "Consider adding an exclusion for MsMpEng.exe to the \u0027Sensitive Process Accessed\u0027 detection rule to reduce noise"
  ],
  "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:** 1.0\nThe detection was triggered by Windows Defender\u0027s core service (MsMpEng.exe) opening a handle to the LSASS process. This is a common and legitimate operation for security software performing real-time protection and memory scanning.\n\n**IOC Analysis:** Both the source and target processes are legitimate Microsoft-signed binaries. The target is the standard Windows LSASS process (C:\\Windows\\System32\\lsass.exe), and the source is MsMpEng.exe (Windows Defender) running from its expected platform directory in ProgramData. Both hashes are verified as non-malicious.\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 running from its expected location in System32 with a valid Microsoft signature and legitimate parent chain (wininit.exe). Historical analyst feedback consistently marks this as a false positive.\n\n**IOC Analysis:** lsass.exe is a critical Windows system binary responsible for handling authentication. The detected process matches the known-good hash, is signed by Microsoft, and resides in C:\\Windows\\system32\\ with wininit.exe as its parent, which is the standard boot sequence for this process.\n\n---\n\n### \ud83e\udd16 deepseek-r1:8b Analysis (Secondary)\n**Verdict:** false_positive | **Confidence:** 0.9\nThe detection event involves a legitimate system process accessing a known Windows binary in its expected location, with no signs of malicious activity.\n\n**IOC Analysis:** The FILE_PATH \u0027C:\\Windows\\system32\\lsass.exe\u0027 is a known legitimate Windows system binary located in the expected directory. The FILE_IS_SIGNED field indicates it is signed, and the hash matches a known system binary. The parent process \u0027wininit.exe\u0027 is also legitimate, confirming normal system operation. This aligns with IOC validation rules for benign behavior.",
  "verdict": "false_positive",
  "voting": {
    "auto_action": "auto_close_fp",
    "mode": "unanimous",
    "total_models": 3,
    "vote_summary": [
      "gemini-cli: false_positive (informational, 100% confidence)",
      "qwen3.5:4b: false_positive (informational, 95% confidence)",
      "deepseek-r1:8b: false_positive (low, 90% confidence)"
    ],
    "votes": [
      {
        "confidence": 1.0,
        "model": "gemini-cli",
        "verdict": "false_positive"
      },
      {
        "confidence": 0.95,
        "model": "qwen3.5:4b",
        "verdict": "false_positive"
      },
      {
        "confidence": 0.9,
        "model": "deepseek-r1:8b",
        "verdict": "false_positive"
      }
    ],
    "winning_count": 3,
    "winning_verdict": "false_positive"
  }
}