{
  "author": "_ext-sigma-7a14fbc3-54d9-4b4d-8700-61eddada04f0[bulk][segment]",
  "cat": "New Firewall Rule Added Via Netsh.EXE",
  "detect": {
    "event": {
      "COMMAND_LINE": "C:\\WINDOWS\\SysWOW64\\\\netsh.exe advfirewall firewall add rule name=Quickbooks__34 dir=in program=\"C:\\Program Files\\Intuit\\QuickBooks Enterprise Solutions 24.0\\CefSharp.BrowserSubprocess.exe\"  action=allow protocol=UDP localport=5353 profile=public,private,domain",
      "FILE_IS_SIGNED": 1,
      "FILE_PATH": "C:\\WINDOWS\\SysWOW64\\netsh.exe",
      "HASH": "8dad37c581651012be601cd12860b39aacbda44ecc7ef116669507c1061e73dd",
      "PARENT": {
        "BASE_ADDRESS": 140696016846848,
        "COMMAND_LINE": "C:\\Windows\\System32\\MsiExec.exe -Embedding 054754E7437F0B6CCA61DB49F7C7425C",
        "FILE_IS_SIGNED": 1,
        "FILE_PATH": "C:\\Windows\\System32\\MsiExec.exe",
        "HASH": "677417ba3ad87f73cd95ad30423998c6089e7eef381b309a562cda1eb6fe178e",
        "MEMORY_USAGE": 14663680,
        "PARENT_ATOM": "ffb361e9a65ea31762c7273669c2a670",
        "PARENT_PROCESS_ID": 38156,
        "PROCESS_ID": 31932,
        "THIS_ATOM": "0e2be6b24c56dfa0613f286f69c2a672",
        "THREADS": 8,
        "TIMESTAMP": 1774364274142,
        "USER_NAME": "DESKTOP-ATSEPSK\\Joy Howell"
      },
      "PARENT_PROCESS_ID": 31932,
      "PROCESS_ID": 42252
    },
    "routing": {
      "arch": 2,
      "did": "",
      "event_id": "eb16bef6-45e0-4d05-bb6e-fc68e41a9338",
      "event_time": 1774364679216,
      "event_type": "NEW_PROCESS",
      "ext_ip": "23.128.32.10",
      "hostname": "desktop-atsepsk",
      "iid": "b2cd59fc-d09d-49e0-a9f2-1fd79ee9c175",
      "int_ip": "192.168.50.200",
      "latency": 1141,
      "moduleid": 2,
      "oid": "d3541070-8b0e-4663-8a6a-aa0727aacd36",
      "parent": "0e2be6b24c56dfa0613f286f69c2a672",
      "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_disk",
        "yara_detection_memory"
      ],
      "this": "9f4e5cfad9e1f0395ffe20b669c2a807"
    }
  },
  "detect_id": "6e45cee1-3ceb-411f-8092-1daa69c2a808",
  "detect_mtd": {
    "author": "Markus Neis, Sander Wiebing",
    "description": "Detects the addition of a new rule to the Windows firewall via netsh",
    "falsepositives": [
      "Legitimate administration activity",
      "Software installations"
    ],
    "level": "medium",
    "references": [
      "https://web.archive.org/web/20190508165435/https://www.operationblockbuster.com/wp-content/uploads/2016/02/Operation-Blockbuster-RAT-and-Staging-Report.pdf"
    ],
    "tags": [
      "attack.defense-evasion",
      "attack.t1562.004",
      "attack.s0246"
    ]
  },
  "gen_time": 1774364680360,
  "link": "https://app.limacharlie.io/orgs/d3541070-8b0e-4663-8a6a-aa0727aacd36/sensors/8f3a47be-5629-4c66-921d-17c39ed07e87/timeline?time=1774364679\u0026selected=9f4e5cfad9e1f0395ffe20b669c2a807",
  "namespace": "general",
  "routing": {
    "arch": 2,
    "did": "",
    "event_id": "eb16bef6-45e0-4d05-bb6e-fc68e41a9338",
    "event_time": 1774364679216,
    "event_type": "NEW_PROCESS",
    "ext_ip": "23.128.32.10",
    "hostname": "desktop-atsepsk",
    "iid": "b2cd59fc-d09d-49e0-a9f2-1fd79ee9c175",
    "int_ip": "192.168.50.200",
    "latency": 1141,
    "moduleid": 2,
    "oid": "d3541070-8b0e-4663-8a6a-aa0727aacd36",
    "parent": "0e2be6b24c56dfa0613f286f69c2a672",
    "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_disk",
      "yara_detection_memory"
    ],
    "this": "9f4e5cfad9e1f0395ffe20b669c2a807"
  },
  "rule_tags": [
    "ext:ext-sigma",
    "attack.defense-evasion",
    "attack.t1562.004",
    "attack.s0246"
  ],
  "source": "d3541070-8b0e-4663-8a6a-aa0727aacd36.b2cd59fc-d09d-49e0-a9f2-1fd79ee9c175.8f3a47be-5629-4c66-921d-17c39ed07e87.10000000.2",
  "source_rule": "service.windows_process_creation/proc_creation_win_netsh_fw_add_rule",
  "ts": 1774364680000
}

{
  "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": 72
    }
  }
}

{
  "confidence": 0.95,
  "false_positive_reason": "Legitimate software installation (QuickBooks)",
  "investigation_questions": [
    "Does the host inventory show a recent installation or update for QuickBooks Enterprise Solutions 24.0?"
  ],
  "ioc_analysis": "netsh.exe is a signed Microsoft binary (hash 8dad37c581651012be601cd12860b39aacbda44ecc7ef116669507c1061e73dd) running from the standard SysWOW64 directory. The parent process is MsiExec.exe, also a signed system binary, indicating an installation context. The targeted program path is a legitimate QuickBooks subdirectory.",
  "iocs_extracted": [
    "C:\\WINDOWS\\SysWOW64\\netsh.exe",
    "C:\\Program Files\\Intuit\\QuickBooks Enterprise Solutions 24.0\\CefSharp.BrowserSubprocess.exe",
    "8dad37c581651012be601cd12860b39aacbda44ecc7ef116669507c1061e73dd"
  ],
  "mitre_techniques": [
    "T1562.004"
  ],
  "recommended_actions": [
    "Close case as false positive (unanimous AI verdict)",
    "Whitelist this specific netsh command pattern when spawned by MsiExec.exe for QuickBooks installations.",
    "Close this alert as a false positive."
  ],
  "risk_score": 12,
  "severity": "low",
  "summary": "**Vote: UNANIMOUS (3/3 -\u003e FALSE POSITIVE)**\n\n### \u264a gemini-cli Analysis (Primary)\n**Verdict:** false_positive | **Confidence:** 1.0\nThis detection is a false positive triggered by a legitimate firewall rule modification during the installation of QuickBooks Enterprise Solutions 24.0. The command was executed by the Windows Installer (MsiExec.exe) and configures inbound access for a known QuickBooks component on the standard mDNS port (5353).\n\n**IOC Analysis:** netsh.exe is a signed Microsoft binary (hash 8dad37c581651012be601cd12860b39aacbda44ecc7ef116669507c1061e73dd) running from the standard SysWOW64 directory. The parent process is MsiExec.exe, also a signed system binary, indicating an installation context. The targeted program path is a legitimate QuickBooks subdirectory.\n\n---\n\n### \ud83e\udd16 qwen3.5:4b Analysis (Secondary)\n**Verdict:** false_positive | **Confidence:** 0.95\nThis event represents a legitimate Windows Firewall rule modification initiated by the Microsoft-signed netsh.exe binary located in its expected SysWOW64 directory. The process is being invoked by MSIExec.exe to configure firewall rules for QuickBooks Enterprise Solutions, which is a common administrative task.\n\n**IOC Analysis:** The file path C:\\WINDOWS\\SysWOW64\\netsh.exe matches the known-good location for 32-bit Windows system binaries. The hash corresponds to the legitimate Microsoft-signed netsh.exe binary. The parent process (MsiExec.exe) is a standard Windows Installer executable, and the command line shows a firewall rule being added for a known application (QuickBooks Enterprise Solutions).\n\n---\n\n### \ud83e\udd16 deepseek-r1:8b Analysis (Secondary)\n**Verdict:** false_positive | **Confidence:** 0.9\nThe detection involves netsh.exe adding a firewall rule for a legitimate QuickBooks component. Given that netsh.exe is a known Windows system binary and the parent process is MsiExec.exe (likely installing QuickBooks), this is likely a false positive.\n\n**IOC Analysis:** The FILE_PATH C:\\WINDOWS\\SysWOW64\\netsh.exe is a known Windows system binary located in its expected directory and is signed, making it benign. The command line specifies adding a rule for CefSharp.BrowserSubprocess.exe, which is part of legitimate QuickBooks software. The parent process MsiExec.exe is also a legitimate Microsoft-signed installer, supporting the benign nature.",
  "verdict": "false_positive",
  "voting": {
    "auto_action": "auto_close_fp",
    "mode": "unanimous",
    "total_models": 3,
    "vote_summary": [
      "gemini-cli: false_positive (low, 100% confidence)",
      "qwen3.5:4b: false_positive (low, 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"
  }
}