{
  "author": "ckeller@fusioncybersecurity.us",
  "cat": "New Code Atypical Path",
  "detect": {
    "event": {
      "FILE_PATH": "C:\\Windows\\Temp\\3A22930E-7933-4932-A06B-DA4B7DB2FB1F\\MpCopyAccelerator.exe",
      "HASH": "ab421a57a0b73cec30ead3714dee50682a8be574313ad65f7e341f63aa88e6b5",
      "PROCESS_ID": 17988
    },
    "routing": {
      "arch": 2,
      "did": "",
      "event_id": "e2a6d023-28cc-4a52-86f4-ac868770b56e",
      "event_time": 1774468112674,
      "event_type": "NEW_DOCUMENT",
      "ext_ip": "23.128.32.10",
      "hostname": "desktop-3nfb237",
      "iid": "b2cd59fc-d09d-49e0-a9f2-1fd79ee9c175",
      "int_ip": "192.168.50.40",
      "latency": 5394,
      "moduleid": 2,
      "oid": "d3541070-8b0e-4663-8a6a-aa0727aacd36",
      "parent": "9727bc761f07cc5e5c90b93a69c43c07",
      "plat": 268435456,
      "sid": "ed8f7c3f-3a1a-493e-8fa4-35eb8c30b136",
      "tags": [
        "fusion-soc-alert",
        "fusion-soc-case",
        "fusion-soc-pulled",
        "fusion-soc-triage",
        "fusionsoc-critical",
        "fusionsoc-high",
        "fusionsoc-investigated",
        "qucikbooks",
        "windows",
        "yara_detection_memory"
      ],
      "this": "03e1c38e2661b74d54726a2669c43c15"
    }
  },
  "detect_id": "2b46c67c-18ad-41f9-8a8d-261369c43c16",
  "gen_time": 1774468118068,
  "link": "https://app.limacharlie.io/orgs/d3541070-8b0e-4663-8a6a-aa0727aacd36/sensors/ed8f7c3f-3a1a-493e-8fa4-35eb8c30b136/timeline?time=1774468112\u0026selected=03e1c38e2661b74d54726a2669c43c15",
  "namespace": "general",
  "routing": {
    "arch": 2,
    "did": "",
    "event_id": "e2a6d023-28cc-4a52-86f4-ac868770b56e",
    "event_time": 1774468112674,
    "event_type": "NEW_DOCUMENT",
    "ext_ip": "23.128.32.10",
    "hostname": "desktop-3nfb237",
    "iid": "b2cd59fc-d09d-49e0-a9f2-1fd79ee9c175",
    "int_ip": "192.168.50.40",
    "latency": 5394,
    "moduleid": 2,
    "oid": "d3541070-8b0e-4663-8a6a-aa0727aacd36",
    "parent": "9727bc761f07cc5e5c90b93a69c43c07",
    "plat": 268435456,
    "sid": "ed8f7c3f-3a1a-493e-8fa4-35eb8c30b136",
    "tags": [
      "fusion-soc-alert",
      "fusion-soc-case",
      "fusion-soc-pulled",
      "fusion-soc-triage",
      "fusionsoc-critical",
      "fusionsoc-high",
      "fusionsoc-investigated",
      "qucikbooks",
      "windows",
      "yara_detection_memory"
    ],
    "this": "03e1c38e2661b74d54726a2669c43c15"
  },
  "source": "d3541070-8b0e-4663-8a6a-aa0727aacd36.b2cd59fc-d09d-49e0-a9f2-1fd79ee9c175.ed8f7c3f-3a1a-493e-8fa4-35eb8c30b136.10000000.2",
  "source_rule": "general.NEW FILE WRITE BYTES SAMPLE GRAB",
  "ts": 1774468118000
}

{
  "virustotal": {
    "malicious": false,
    "provider": "virustotal",
    "reputation": 0,
    "stats": {
      "confirmed-timeout": 0,
      "failure": 0,
      "harmless": 0,
      "malicious": 0,
      "suspicious": 0,
      "timeout": 0,
      "type-unsupported": 4,
      "undetected": 71
    }
  }
}

{
  "confidence": 0.943,
  "false_positive_reason": "legitimate_system_process",
  "investigation_questions": [
    "Is this file part of a recent Windows Defender platform update?"
  ],
  "ioc_analysis": "The hash ab421a57a0b73cec30ead3714dee50682a8be574313ad65f7e341f63aa88e6b5 is a known legitimate component of Microsoft Windows Defender (Microsoft Malware Protection Copy Accelerator Utility). The file location in C:\\Windows\\Temp is common for staged system updates or temporary execution by system services.",
  "iocs_extracted": [
    "ab421a57a0b73cec30ead3714dee50682a8be574313ad65f7e341f63aa88e6b5",
    "C:\\Windows\\Temp\\3A22930E-7933-4932-A06B-DA4B7DB2FB1F\\MpCopyAccelerator.exe"
  ],
  "mitre_techniques": [],
  "recommended_actions": [
    "Close case as false positive (unanimous AI verdict)",
    "No action required.",
    "Consider tuning the \u0027NEW FILE WRITE BYTES SAMPLE GRAB\u0027 rule to exclude known-good Microsoft hashes in temporary directories."
  ],
  "risk_score": 7,
  "severity": "low",
  "summary": "**Vote: UNANIMOUS (3/3 -\u003e FALSE POSITIVE)**\n\n### \u264a gemini-cli Analysis (Primary)\n**Verdict:** false_positive | **Confidence:** 0.98\nThe detection is a false positive. The file MpCopyAccelerator.exe is a legitimate Microsoft Windows Defender utility, and the specific hash (ab421a...) is recognized as a known-good binary with 0/71 detections on VirusTotal. Its execution or presence in a temporary directory is consistent with standard Windows Defender maintenance and update activities.\n\n**IOC Analysis:** The hash ab421a57a0b73cec30ead3714dee50682a8be574313ad65f7e341f63aa88e6b5 is a known legitimate component of Microsoft Windows Defender (Microsoft Malware Protection Copy Accelerator Utility). The file location in C:\\Windows\\Temp is common for staged system updates or temporary execution by system services.\n\n---\n\n### \ud83e\udd16 qwen3.5:4b Analysis (Secondary + RAG)\n**Verdict:** false_positive | **Confidence:** 0.95\nThe detection is a false positive as MpCopyAccelerator.exe is a legitimate Microsoft Windows Defender utility with a known-good hash and no suspicious activity was detected during investigation.\n\n**IOC Analysis:** MpCopyAccelerator.exe is a standard Windows Defender process used for file copy acceleration. The specific hash matches a known-good binary, and the presence in C:\\Windows\\Temp is consistent with temporary maintenance activities. No malicious behavior or anomalous execution patterns were observed.\n\n---\n\n### \ud83e\udd16 deepseek-r1:8b Analysis (Secondary + RAG)\n**Verdict:** false_positive | **Confidence:** 0.9\nThe detection event is a false positive as MpCopyAccelerator.exe is a legitimate Microsoft Windows Defender utility, commonly found in temporary directories during system maintenance. The hash and file path align with known-good indicators, and no malicious activity was detected in the investigation window.\n\n**IOC Analysis:** The IOC FILE_PATH C:\\Windows\\Temp\\3A22930E-7933-4932-A06B-DA4B7DB2FB1F\\MpCopyAccelerator.exe and HASH ab421a57a0b73cec30ead3714dee50682a8be574313ad65f7e341f63aa88e6b5 are benign. MpCopyAccelerator.exe is a standard Windows Defender component, and the hash has a clean VirusTotal score with 0/71 detections, indicating no malicious associations. The file\u0027s presence in the Temp directory is consistent with legitimate system operations.",
  "verdict": "false_positive",
  "voting": {
    "auto_action": "auto_close_fp",
    "mode": "unanimous",
    "total_models": 3,
    "vote_summary": [
      "gemini-cli: false_positive (low, 98% confidence)",
      "qwen3.5:4b +RAG: false_positive (informational, 95% confidence)",
      "deepseek-r1:8b +RAG: false_positive (low, 90% confidence)"
    ],
    "votes": [
      {
        "confidence": 0.98,
        "model": "gemini-cli",
        "verdict": "false_positive"
      },
      {
        "confidence": 0.95,
        "had_rag": true,
        "model": "qwen3.5:4b",
        "verdict": "false_positive"
      },
      {
        "confidence": 0.9,
        "had_rag": true,
        "model": "deepseek-r1:8b",
        "verdict": "false_positive"
      }
    ],
    "winning_count": 3,
    "winning_verdict": "false_positive"
  }
}