{
  "id": "investigation-summary:c94b3ca0-893a-444b-ba41-36eae0216030",
  "type": "pcap-investigation-summary",
  "label": "PCAP investigation summary",
  "model": "gpt-4.1-2025-04-14",
  "stale": false,
  "status": "analyst-review-required",
  "content": "# PCAP investigation summary\n\n## What happened\n\nThe device with IP 139.199.184.166 initiated multiple repeated HTTP POST requests to the URLs http://128.199.64.235/1.php and http://128.199.64.235/qq.php, which may indicate beaconing or suspicious data transfer activity.\n\nReputation and threat intelligence checks on 139.199.184.166 and the contacted URLs returned no confirmation of known threats, but rate limiting or the absence of records does not mean the endpoints are benign.\n\n## Who was involved\n\n- 139.199.184.166 — Observed client repeatedly communicating with 128.199.64.235 over HTTP; involved in outbound POST activity.\n\n## Key indicators\n\n- http://128.199.64.235/1.php received suspicious repeated POST requests from 139.199.184.166; flagged for potential beaconing or data transfer review.\n- http://128.199.64.235/qq.php was targeted by repeated outbound POST requests from 139.199.184.166, suggesting suspicious interaction.\n\n## What remains uncertain\n\n- It is unknown if any downloaded or uploaded payloads were successfully delivered or executed due to lack of packet contents or endpoint execution evidence.\n\nAnalyst-review draft. Exact evidence references and provider provenance are retained in the structured record.",
  "summary": "The device with IP 139.199.184.166 initiated multiple repeated HTTP POST requests to the URLs http://128.199.64.235/1.php and http://128.199.64.235/qq.php, which may indicate beaconing or suspicious data transfer activity. Reputation and threat intelligence checks on 139.199.184.166 and the contacted URLs returned no confirmation of known threats, but rate limiting or the absence of records does not mean the endpoints are benign.",
  "coverage": {
    "warnings": [],
    "projection": "pcap-brief-evidence-v1",
    "source_digest": "658bd679a390ce4ba3a0cfec0e9155d91ee3f53763dbf5fcefd9f15ec7ae062b",
    "candidate_total": 3,
    "omitted_records": {
      "findings": 0,
      "artifacts": 149,
      "candidates": 0,
      "identities": 0,
      "techniques": 0,
      "selected_network_events": 620
    },
    "included_records": {
      "limits": 1,
      "capture": 1,
      "network": 2,
      "findings": 2,
      "candidates": 3,
      "reputation_coverage": 1
    },
    "supplement_scope": "Bounded selected packet metadata, direct reputation, identities and transfer relationships; no payload bodies, prior-case content or exhaustive inventory. Full data remains in source analysis.",
    "source_characters": 4174,
    "enrichment_retained_targets": 1
  },
  "filename": "2019-12-25-traffic-analysis-exercise.pcap",
  "provider": "openai",
  "report_id": "pcap:389d8086-ac21-4e6d-9270-fdd62ee6d5b0",
  "created_at": "2026-09-22T18:59:31.318099+00:00",
  "structured": {
    "iocs": [
      {
        "kind": "url",
        "text": "http://128.199.64.235/1.php received suspicious repeated POST requests from 139.199.184.166; flagged for potential beaconing or data transfer review.",
        "basis": "assessment",
        "value": "http://128.199.64.235/1.php",
        "evidence": [
          {
            "end": 548,
            "quote": "malicious verdict\",\"type\":\"url\",\"value\":\"http://128.199.64.235/1.php\"}",
            "start": 478,
            "reference": "/api/pcap/analyses/389d8086-ac21-4e6d-9270-fdd62ee6d5b0#assessment/observable-ad076460afa5cef5957eaae4",
            "source_id": "S0005",
            "source_sha256": "a194c4aada1325bd544ba1f825969f7c32de15f1c3a99efa0be6200d576eae60"
          },
          {
            "end": 400,
            "quote": "{\"explanation\":\"The same endpoint pair and HTTP target produced repeated POST requests suitable for beaconing or data transfer review.\",\"frames\":[930,933,1497],\"metrics\":{\"declared_body_bytes\":128,\"destination\":\"10.12.25.101\",\"host\":\"128.199.64.235\",\"port\":80,\"request_count\":6,\"source\":\"139.199.184.166\",\"uri\":\"/1.php\"},\"rule_id\":\"repeated-http-posts\",\"title\":\"Repeated outbound HTTP POST activity\"}",
            "start": 0,
            "reference": "/api/pcap/analyses/389d8086-ac21-4e6d-9270-fdd62ee6d5b0#finding/finding-23fe904e78a62affb365081e",
            "source_id": "S0009",
            "source_sha256": "d48754de23bad4aa9cbd53cc968e51e942b54f220cdafeb4d0d1b3ec6a499762"
          }
        ]
      },
      {
        "kind": "url",
        "text": "http://128.199.64.235/qq.php was targeted by repeated outbound POST requests from 139.199.184.166, suggesting suspicious interaction.",
        "basis": "assessment",
        "value": "http://128.199.64.235/qq.php",
        "evidence": [
          {
            "end": 549,
            "quote": "malicious verdict\",\"type\":\"url\",\"value\":\"http://128.199.64.235/qq.php\"}",
            "start": 478,
            "reference": "/api/pcap/analyses/389d8086-ac21-4e6d-9270-fdd62ee6d5b0#assessment/observable-df3e0f32ce5951f0acfc2d89",
            "source_id": "S0006",
            "source_sha256": "f3a29c5f0074f348b485c7865637acc7fda2411e02a00b609e9bbb88a536a6c6"
          },
          {
            "end": 401,
            "quote": "{\"explanation\":\"The same endpoint pair and HTTP target produced repeated POST requests suitable for beaconing or data transfer review.\",\"frames\":[591,924,1090],\"metrics\":{\"declared_body_bytes\":119,\"destination\":\"10.12.25.101\",\"host\":\"128.199.64.235\",\"port\":80,\"request_count\":6,\"source\":\"139.199.184.166\",\"uri\":\"/qq.php\"},\"rule_id\":\"repeated-http-posts\",\"title\":\"Repeated outbound HTTP POST activity\"}",
            "start": 0,
            "reference": "/api/pcap/analyses/389d8086-ac21-4e6d-9270-fdd62ee6d5b0#finding/finding-9e298ff810ccf802b8d6c285",
            "source_id": "S0010",
            "source_sha256": "0ef247a7af1e86d839f7ce638c62d1257454d5d3de4ed9d866a15c2d8f10fa4e"
          }
        ]
      }
    ],
    "ttps": [],
    "identities": [
      {
        "kind": "ip",
        "text": "Observed client repeatedly communicating with 128.199.64.235 over HTTP; involved in outbound POST activity.",
        "basis": "assessment",
        "value": "139.199.184.166",
        "evidence": [
          {
            "end": 400,
            "quote": "{\"explanation\":\"The same endpoint pair and HTTP target produced repeated POST requests suitable for beaconing or data transfer review.\",\"frames\":[930,933,1497],\"metrics\":{\"declared_body_bytes\":128,\"destination\":\"10.12.25.101\",\"host\":\"128.199.64.235\",\"port\":80,\"request_count\":6,\"source\":\"139.199.184.166\",\"uri\":\"/1.php\"},\"rule_id\":\"repeated-http-posts\",\"title\":\"Repeated outbound HTTP POST activity\"}",
            "start": 0,
            "reference": "/api/pcap/analyses/389d8086-ac21-4e6d-9270-fdd62ee6d5b0#finding/finding-23fe904e78a62affb365081e",
            "source_id": "S0009",
            "source_sha256": "d48754de23bad4aa9cbd53cc968e51e942b54f220cdafeb4d0d1b3ec6a499762"
          }
        ]
      }
    ],
    "next_steps": [],
    "uncertainties": [
      {
        "text": "It is unknown if any downloaded or uploaded payloads were successfully delivered or executed due to lack of packet contents or endpoint execution evidence.",
        "basis": "assessment",
        "evidence": [
          {
            "end": 400,
            "quote": "{\"internal_lookup\":{\"matched_observables\":0,\"no_exact_match\":710,\"observable_limit\":5000,\"observables_checked\":710,\"observables_total\":710,\"prior_case_limit_reached\":true,\"prior_cases_checked\":50,\"truncated\":false},\"visibility\":\"Encrypted application payloads are not decrypted. No endpoint execution, persistence or actor attribution is established by a download or connection alone.\",\"warnings\":[]}",
            "start": 0,
            "reference": "/api/pcap/analyses/389d8086-ac21-4e6d-9270-fdd62ee6d5b0#coverage",
            "source_id": "S0002",
            "source_sha256": "d83c587eb9af4843d5098e9c548e09fe0acb44b8fb289acbfe82bc12b3af2829"
          }
        ]
      }
    ],
    "what_happened": [
      {
        "text": "The device with IP 139.199.184.166 initiated multiple repeated HTTP POST requests to the URLs http://128.199.64.235/1.php and http://128.199.64.235/qq.php, which may indicate beaconing or suspicious data transfer activity.",
        "basis": "assessment",
        "evidence": [
          {
            "end": 400,
            "quote": "{\"explanation\":\"The same endpoint pair and HTTP target produced repeated POST requests suitable for beaconing or data transfer review.\",\"frames\":[930,933,1497],\"metrics\":{\"declared_body_bytes\":128,\"destination\":\"10.12.25.101\",\"host\":\"128.199.64.235\",\"port\":80,\"request_count\":6,\"source\":\"139.199.184.166\",\"uri\":\"/1.php\"},\"rule_id\":\"repeated-http-posts\",\"title\":\"Repeated outbound HTTP POST activity\"}",
            "start": 0,
            "reference": "/api/pcap/analyses/389d8086-ac21-4e6d-9270-fdd62ee6d5b0#finding/finding-23fe904e78a62affb365081e",
            "source_id": "S0009",
            "source_sha256": "d48754de23bad4aa9cbd53cc968e51e942b54f220cdafeb4d0d1b3ec6a499762"
          },
          {
            "end": 401,
            "quote": "{\"explanation\":\"The same endpoint pair and HTTP target produced repeated POST requests suitable for beaconing or data transfer review.\",\"frames\":[591,924,1090],\"metrics\":{\"declared_body_bytes\":119,\"destination\":\"10.12.25.101\",\"host\":\"128.199.64.235\",\"port\":80,\"request_count\":6,\"source\":\"139.199.184.166\",\"uri\":\"/qq.php\"},\"rule_id\":\"repeated-http-posts\",\"title\":\"Repeated outbound HTTP POST activity\"}",
            "start": 0,
            "reference": "/api/pcap/analyses/389d8086-ac21-4e6d-9270-fdd62ee6d5b0#finding/finding-9e298ff810ccf802b8d6c285",
            "source_id": "S0010",
            "source_sha256": "0ef247a7af1e86d839f7ce638c62d1257454d5d3de4ed9d866a15c2d8f10fa4e"
          }
        ]
      },
      {
        "text": "Reputation and threat intelligence checks on 139.199.184.166 and the contacted URLs returned no confirmation of known threats, but rate limiting or the absence of records does not mean the endpoints are benign.",
        "basis": "assessment",
        "evidence": [
          {
            "end": 446,
            "quote": "{\"classification\":\"suspicious\",\"reasons\":[{\"finding_id\":\"finding-9e298ff810ccf802b8d6c285\",\"frame_number\":591,\"kind\":\"behavior\",\"rule_id\":\"repeated-http-posts\"},{\"finding_id\":\"finding-9e298ff810ccf802b8d6c285\",\"frame_number\":924,\"kind\":\"behavior\",\"rule_id\":\"repeated-http-posts\"},{\"finding_id\":\"finding-9e298ff810ccf802b8d6c285\",\"frame_number\":1090,\"kind\":\"behavior\",\"rule_id\":\"repeated-http-posts\"}],\"reputation_status\":{\"threatfox\":\"not_found\",",
            "start": 0,
            "reference": "/api/pcap/analyses/389d8086-ac21-4e6d-9270-fdd62ee6d5b0#assessment/observable-f3d1e49eb7eb8474e08974ef",
            "source_id": "S0004",
            "source_sha256": "3f4a1e6c047e12a18203f74913795a844f482bbd0387be2e51ae780d7e261111"
          },
          {
            "end": 595,
            "quote": "\"virustotal\":\"deferred-rate-limit\"},\"role\":\"investigation candidate, not an unconditional malicious verdict\",\"type\":\"ipv4\",\"value\":\"139.199.184.166\"}",
            "start": 446,
            "reference": "/api/pcap/analyses/389d8086-ac21-4e6d-9270-fdd62ee6d5b0#assessment/observable-f3d1e49eb7eb8474e08974ef",
            "source_id": "S0004",
            "source_sha256": "3f4a1e6c047e12a18203f74913795a844f482bbd0387be2e51ae780d7e261111"
          },
          {
            "end": 477,
            "quote": "{\"classification\":\"suspicious\",\"reasons\":[{\"finding_id\":\"finding-23fe904e78a62affb365081e\",\"frame_number\":930,\"kind\":\"behavior\",\"rule_id\":\"repeated-http-posts\"},{\"finding_id\":\"finding-23fe904e78a62affb365081e\",\"frame_number\":933,\"kind\":\"behavior\",\"rule_id\":\"repeated-http-posts\"},{\"finding_id\":\"finding-23fe904e78a62affb365081e\",\"frame_number\":1497,\"kind\":\"behavior\",\"rule_id\":\"repeated-http-posts\"}],\"reputation_status\":{},\"role\":\"investigation candidate, not an unconditional",
            "start": 0,
            "reference": "/api/pcap/analyses/389d8086-ac21-4e6d-9270-fdd62ee6d5b0#assessment/observable-ad076460afa5cef5957eaae4",
            "source_id": "S0005",
            "source_sha256": "a194c4aada1325bd544ba1f825969f7c32de15f1c3a99efa0be6200d576eae60"
          }
        ]
      }
    ]
  },
  "validation": "schema-and-exact-quote-binding; not semantic proof",
  "word_count": 124,
  "analysis_id": "389d8086-ac21-4e6d-9270-fdd62ee6d5b0",
  "token_usage": {
    "total_tokens": 5122,
    "prompt_tokens": 4531,
    "completion_tokens": 591
  },
  "authoritative": false,
  "effective_tlp": "TLP:CLEAR",
  "source_sha256": "36fd79b32751d8516ef0f7925d79537939bcda39e089a8470c3495eeaf939d86",
  "capture_sha256": "a86c6a31ed04ed05571f997d296f8e7c7be7f262f6e602bd72d9e5de656945c5",
  "prompt_version": "pcap-investigation-summary-v5",
  "requested_model": "gpt-4.1",
  "source_manifest": [
    {
      "kind": "packet_fact",
      "offset": 0,
      "sha256": "e87f82020991dbba047193d92453ed313d1bd54fefe9f1b7fcc4dabcb6a789f0",
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      "source_id": "S0001"
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    {
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    {
      "kind": "intelligence_lead",
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      "reference": "/api/pcap/analyses/389d8086-ac21-4e6d-9270-fdd62ee6d5b0#enrichment-coverage",
      "source_id": "S0003"
    },
    {
      "kind": "rule_candidate",
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    },
    {
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    {
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      "source_id": "S0010"
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  ],
  "token_usage_note": "Provider-reported counts when available; never estimated from character length.",
  "generation_seconds": 6.158,
  "generation_attempts": [
    {
      "attempt": 1,
      "validation": "passed",
      "token_usage": {
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        "prompt_tokens": 4531,
        "completion_tokens": 591,
        "prompt_tokens_details": {
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        },
        "completion_tokens_details": {
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          "reasoning_tokens": 0,
          "accepted_prediction_tokens": 0,
          "rejected_prediction_tokens": 0
        }
      },
      "finish_reason": "stop",
      "provider_returned_model": "gpt-4.1-2025-04-14"
    }
  ],
  "validation_adjustments": [
    {
      "basis": "assessment",
      "index": 0,
      "action": "evidence-level-downgrade",
      "section": "identities"
    },
    {
      "index": 0,
      "action": "optional-claim-omitted",
      "reason": "identifier_binding",
      "section": "iocs"
    },
    {
      "index": 0,
      "action": "optional-claim-omitted",
      "reason": "uncited_identifier",
      "section": "next_steps"
    }
  ],
  "provider_returned_model": "gpt-4.1-2025-04-14"
}