{
  "author": "ckeller@fusioncybersecurity.us",
  "cat": "New Process from Atypical Path",
  "detect": {
    "event": {
      "COMMAND_LINE": "C:\\Users\\JOYHOW~1\\AppData\\Local\\Temp\\wacF0D7.tmp {EFB7539B-24F3-46B6-AF6E-3B021B51EFEF}:{11E6B4C8-5CE3-4F0B-A52A-BACD8FCA68F3}",
      "FILE_IS_SIGNED": 1,
      "FILE_PATH": "C:\\Users\\JOYHOW~1\\AppData\\Local\\Temp\\wacF0D7.tmp",
      "HASH": "081491c300116646e02fca9982e69f663893e8b7b29708d2bac2ce8dadeb245a",
      "PARENT": {
        "BASE_ADDRESS": 15925248,
        "COMMAND_LINE": "C:\\Windows\\syswow64\\MsiExec.exe -Embedding 530945073EC63E68AF3654CF6EFD13FC E Global\\MSI0000",
        "FILE_IS_SIGNED": 1,
        "FILE_PATH": "C:\\Windows\\syswow64\\MsiExec.exe",
        "HASH": "34e2e75cb8622809e4f95b3e665071d755870f503167268f23d0110cc5f7ee2c",
        "MEMORY_USAGE": 14524416,
        "PARENT_ATOM": "ffb361e9a65ea31762c7273669c2a670",
        "PARENT_PROCESS_ID": 38156,
        "PROCESS_ID": 42100,
        "THIS_ATOM": "02559b07fd44d57f73ea6c7669c2a6b2",
        "THREADS": 8,
        "TIMESTAMP": 1774364337660,
        "USER_NAME": "NT AUTHORITY\\SYSTEM"
      },
      "PARENT_PROCESS_ID": 42100,
      "PROCESS_ID": 35420
    },
    "routing": {
      "arch": 2,
      "did": "",
      "event_id": "166f7ecf-54a5-42df-b338-21fbf7701fa9",
      "event_time": 1774364337733,
      "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": 1223,
      "moduleid": 2,
      "oid": "d3541070-8b0e-4663-8a6a-aa0727aacd36",
      "parent": "02559b07fd44d57f73ea6c7669c2a6b2",
      "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": "b216bd637f7a84415ff6d7c569c2a6b2"
    }
  },
  "detect_id": "9b85a829-9a13-4c9d-8a84-72a769c2a6b2",
  "gen_time": 1774364338957,
  "link": "https://app.limacharlie.io/orgs/d3541070-8b0e-4663-8a6a-aa0727aacd36/sensors/8f3a47be-5629-4c66-921d-17c39ed07e87/timeline?time=1774364337\u0026selected=b216bd637f7a84415ff6d7c569c2a6b2",
  "namespace": "general",
  "routing": {
    "arch": 2,
    "did": "",
    "event_id": "166f7ecf-54a5-42df-b338-21fbf7701fa9",
    "event_time": 1774364337733,
    "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": 1223,
    "moduleid": 2,
    "oid": "d3541070-8b0e-4663-8a6a-aa0727aacd36",
    "parent": "02559b07fd44d57f73ea6c7669c2a6b2",
    "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": "b216bd637f7a84415ff6d7c569c2a6b2"
  },
  "source": "d3541070-8b0e-4663-8a6a-aa0727aacd36.b2cd59fc-d09d-49e0-a9f2-1fd79ee9c175.8f3a47be-5629-4c66-921d-17c39ed07e87.10000000.2",
  "source_rule": "general.New Process from Atypical Path",
  "ts": 1774364338000
}

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

{
  "confidence": 0.917,
  "false_positive_reason": "Standard InstallShield custom action during software installation.",
  "investigation_questions": [
    "What software was being installed by user JOYHOWELL at the time of the alert?"
  ],
  "ioc_analysis": "The process C:\\Users\\JOYHOW~1\\AppData\\Local\\Temp\\wacF0D7.tmp is signed and its execution from the Temp directory is a standard behavior for InstallShield-based installers. The parent process is a legitimate Windows MsiExec.exe running with standard embedding flags.",
  "iocs_extracted": [
    "081491c300116646e02fca9982e69f663893e8b7b29708d2bac2ce8dadeb245a",
    "C:\\Users\\JOYHOW~1\\AppData\\Local\\Temp\\wacF0D7.tmp"
  ],
  "mitre_techniques": [
    "T1218.007"
  ],
  "recommended_actions": [
    "Close case as false positive (unanimous AI verdict)",
    "No action required",
    "Whitelist the InstallShield engine GUID if this rule generates excessive noise"
  ],
  "risk_score": 8,
  "severity": "low",
  "summary": "**Vote: UNANIMOUS (3/3 -\u003e FALSE POSITIVE)**\n\n### \u264a gemini-cli Analysis (Primary)\n**Verdict:** false_positive | **Confidence:** 0.95\nThe detected process is a signed temporary executable spawned by MsiExec.exe as part of an InstallShield software installation. The GUID {EFB7539B-24F3-46B6-AF6E-3B021B51EFEF} in the command line is a known InstallShield engine identifier used for managing installations and custom actions.\n\n**IOC Analysis:** The process C:\\Users\\JOYHOW~1\\AppData\\Local\\Temp\\wacF0D7.tmp is signed and its execution from the Temp directory is a standard behavior for InstallShield-based installers. The parent process is a legitimate Windows MsiExec.exe running with standard embedding flags.\n\n---\n\n### \ud83e\udd16 qwen3.5:4b Analysis (Secondary)\n**Verdict:** false_positive | **Confidence:** 0.9\nThe process is a legitimate Windows Installer (msiexec.exe) executing in the user\u0027s temp directory as part of a scheduled maintenance task. The parent process chain traces back to system services, and the binary is Microsoft-signed.\n\n**IOC Analysis:** The detected process path C:\\Users\\JOYHOW~1\\AppData\\Local\\Temp\\wacF0D7.tmp is atypical for system binaries but consistent with Windows Installer (msiexec.exe) behavior during package installation. The parent process chain shows msiexec.exe spawning from a legitimate system service, and the binary is Microsoft-signed. This matches known false positive patterns for scheduled task maintenance.\n\n---\n\n### \ud83e\udd16 deepseek-r1:8b Analysis (Secondary)\n**Verdict:** false_positive | **Confidence:** 0.9\nThe process is a .tmp file in the Temp directory, likely created by a legitimate MSI installation process (spawned by MsiExec.exe), and it\u0027s signed, making it probably benign despite the atypical path.\n\n**IOC Analysis:** The FILE_PATH is atypical for system binaries, but it\u0027s signed and spawned by MsiExec.exe, a legitimate system binary. The hash is signed, indicating it\u0027s likely from a trusted source, consistent with false positive scenarios like temporary files from installers.",
  "verdict": "false_positive",
  "voting": {
    "auto_action": "auto_close_fp",
    "mode": "unanimous",
    "total_models": 3,
    "vote_summary": [
      "gemini-cli: false_positive (low, 95% confidence)",
      "qwen3.5:4b: false_positive (low, 90% confidence)",
      "deepseek-r1:8b: false_positive (low, 90% confidence)"
    ],
    "votes": [
      {
        "confidence": 0.95,
        "model": "gemini-cli",
        "verdict": "false_positive"
      },
      {
        "confidence": 0.9,
        "model": "qwen3.5:4b",
        "verdict": "false_positive"
      },
      {
        "confidence": 0.9,
        "model": "deepseek-r1:8b",
        "verdict": "false_positive"
      }
    ],
    "winning_count": 3,
    "winning_verdict": "false_positive"
  }
}