{
  "author": "ckeller@fusioncybersecurity.us",
  "cat": "YARA Detection on Disk - Macos_Infostealer_Wallets_8e469ea0",
  "detect": {
    "event": {
      "FILE_PATH": "C:\\Program Files (x86)\\Microsoft\\EdgeWebView\\Application\\146.0.3856.62\\msedge.dll",
      "RULE_NAME": "Macos_Infostealer_Wallets_8e469ea0"
    },
    "routing": {
      "arch": 2,
      "did": "",
      "event_id": "93656b89-49ba-4ddc-a0ef-d7885dc6795d",
      "event_time": 1773771086342,
      "event_type": "YARA_DETECTION",
      "ext_ip": "23.128.32.10",
      "hostname": "desktop-atsepsk",
      "iid": "b2cd59fc-d09d-49e0-a9f2-1fd79ee9c175",
      "int_ip": "192.168.50.200",
      "latency": 72,
      "moduleid": 2,
      "oid": "d3541070-8b0e-4663-8a6a-aa0727aacd36",
      "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_memory"
      ],
      "this": "5716c134ebf4bdb8a9904c0269b9994e"
    }
  },
  "detect_id": "64ae9cad-e727-43c8-964e-d4f669b9994e",
  "gen_time": 1773771086414,
  "link": "https://app.limacharlie.io/orgs/d3541070-8b0e-4663-8a6a-aa0727aacd36/sensors/8f3a47be-5629-4c66-921d-17c39ed07e87/timeline?time=1773771086\u0026selected=5716c134ebf4bdb8a9904c0269b9994e",
  "namespace": "general",
  "routing": {
    "arch": 2,
    "did": "",
    "event_id": "93656b89-49ba-4ddc-a0ef-d7885dc6795d",
    "event_time": 1773771086342,
    "event_type": "YARA_DETECTION",
    "ext_ip": "23.128.32.10",
    "hostname": "desktop-atsepsk",
    "iid": "b2cd59fc-d09d-49e0-a9f2-1fd79ee9c175",
    "int_ip": "192.168.50.200",
    "latency": 72,
    "moduleid": 2,
    "oid": "d3541070-8b0e-4663-8a6a-aa0727aacd36",
    "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_memory"
    ],
    "this": "5716c134ebf4bdb8a9904c0269b9994e"
  },
  "source": "d3541070-8b0e-4663-8a6a-aa0727aacd36.b2cd59fc-d09d-49e0-a9f2-1fd79ee9c175.8f3a47be-5629-4c66-921d-17c39ed07e87.10000000.2",
  "source_rule": "general.YARA Detection on Disk",
  "ts": 1773771086000
}

{
  "confidence": 0.933,
  "false_positive_reason": "Rule mismatch: A macOS-specific infostealer rule triggered on a legitimate Windows system binary located in its expected path.",
  "investigation_questions": [
    "Are there any other systems reporting this specific YARA trigger on the same version of EdgeWebView?",
    "What specific string or pattern in msedge.dll caused the YARA match?"
  ],
  "ioc_analysis": "The file \u0027msedge.dll\u0027 is a core component of Microsoft Edge and is located in its expected installation directory. The YARA rule \u0027Macos_Infostealer_Wallets_8e469ea0\u0027 is designed for macOS threats and likely triggered due to a signature collision with generic patterns (such as wallet-related strings or byte sequences) found within the large Microsoft binary.",
  "iocs_extracted": [
    "C:\\Program Files (x86)\\Microsoft\\EdgeWebView\\Application\\146.0.3856.62\\msedge.dll"
  ],
  "mitre_techniques": [],
  "recommended_actions": [
    "Close case as false positive (unanimous AI verdict)",
    "Whitelist this specific version of msedge.dll if the rule continues to trigger.",
    "Tune the YARA rule \u0027Macos_Infostealer_Wallets_8e469ea0\u0027 to include platform-specific conditions (e.g., checking for Mach-O headers) to prevent execution on PE files."
  ],
  "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\nThis detection is a false positive where a macOS-specific YARA rule (Macos_Infostealer_Wallets) triggered on a legitimate Microsoft Windows DLL (msedge.dll). The file path is consistent with standard Microsoft Edge WebView installations, and the rule\u0027s target platform (macOS) is incompatible with the flagged asset (Windows).\n\n**IOC Analysis:** The file \u0027msedge.dll\u0027 is a core component of Microsoft Edge and is located in its expected installation directory. The YARA rule \u0027Macos_Infostealer_Wallets_8e469ea0\u0027 is designed for macOS threats and likely triggered due to a signature collision with generic patterns (such as wallet-related strings or byte sequences) found within the large Microsoft binary.\n\n---\n\n### \ud83e\udd16 qwen3.5:4b Analysis (Secondary)\n**Verdict:** false_positive | **Confidence:** 0.95\nThe detection flagged a legitimate Microsoft Edge WebView2 DLL file located in its expected Program Files directory. The YARA rule appears to be misconfigured or targeting the wrong platform (MacOS) for a Windows system file.\n\n**IOC Analysis:** The file path C:\\Program Files (x86)\\Microsoft\\EdgeWebView\\Application\\146.0.3856.62\\msedge.dll is a known-good Microsoft component used by the Edge browser. The YARA rule name \u0027Macos_Infostealer_Wallets\u0027 suggests a cross-platform detection that may have false positives on Windows due to similar file structures or misconfigured signatures.\n\n---\n\n### \ud83e\udd16 deepseek-r1:8b Analysis (Secondary)\n**Verdict:** false_positive | **Confidence:** 0.9\nThe detection is likely a false positive as the file is part of Microsoft Edge, a legitimate application, and located in the expected directory. The YARA rule may be overly broad or misconfigured for this context.\n\n**IOC Analysis:** The IOC is the file path \u0027C:\\Program Files (x86)\\Microsoft\\EdgeWebView\\Application\\146.0.3856.62\\msedge.dll\u0027, which matches a legitimate Microsoft Edge component. No malicious hashes or signatures were provided, and the location aligns with expected directories for legitimate software.",
  "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, 95% confidence)",
      "deepseek-r1:8b: false_positive (low, 90% confidence)"
    ],
    "votes": [
      {
        "confidence": 0.95,
        "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"
  }
}