{
  "id": "investigation-summary:6e58f2e4-e195-4862-b38f-78dd19f603f4",
  "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\nHost 172.17.8.109 \\(Dunn-Windows-PC\\) downloaded an executable file identified as Portable Executable \\(PE\\) format from http://91.121.30.169:8000/91msE95B/actiV.bin during the capture period.\n\n## Who was involved\n\n- 172.17.8.109 is the primary internal IP performing network and file download activity in the capture.\n- The host name Dunn-Windows-PC is associated with IP 172.17.8.109.\n- Account margaret.dunn initiated Kerberos authentication using 172.17.8.109.\n\n## What remains uncertain\n\n- It is not established by packet data whether the downloaded file 9f6e3e65aedca997c6445329663bd1d279392a34cfda7d1b56461eb41641fa08 executed or resulted in compromise on 172.17.8.109.\n\n## Next check\n\n- Review endpoint telemetry or host process logs from 172.17.8.109 to determine if the downloaded PE file was launched.\n\nAnalyst-review draft. Exact evidence references and provider provenance are retained in the structured record.",
  "summary": "Host 172.17.8.109 (Dunn-Windows-PC) downloaded an executable file identified as Portable Executable (PE) format from http://91.121.30.169:8000/91msE95B/actiV.bin during the capture period.",
  "coverage": {
    "warnings": [],
    "projection": "pcap-brief-evidence-v1",
    "source_digest": "ab7a82d96e9823701e95f900ce1b3e1865a929208fd4c7742f02dbedcc5a2b69",
    "candidate_total": 0,
    "omitted_records": {
      "findings": 0,
      "artifacts": 1,
      "candidates": 0,
      "identities": 0,
      "techniques": 0,
      "selected_network_events": 0
    },
    "compact_evidence": false,
    "included_records": {
      "limits": 1,
      "capture": 1,
      "findings": 4,
      "transfers": 1,
      "identities": 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": 4183,
    "enrichment_retained_targets": 11
  },
  "filename": "2019-01-28-traffic-analysis-exercise.pcap",
  "provider": "openai",
  "report_id": "pcap:f4c6d05d-a600-4616-9c66-c96965645a65",
  "created_at": "2026-09-22T19:16:00.549451+00:00",
  "structured": {
    "iocs": [],
    "ttps": [],
    "identities": [
      {
        "kind": "ip",
        "text": "172.17.8.109 is the primary internal IP performing network and file download activity in the capture.",
        "basis": "observed",
        "value": "172.17.8.109",
        "evidence": [
          {
            "end": 355,
            "quote": "{\"bindings\":[{\"account\":\"\",\"frame_number\":409,\"owner_ip\":\"0.0.0.0\",\"relationship\":\"dhcp-client-assertion\"},{\"account\":\"\",\"frame_number\":1058,\"owner_ip\":\"0.0.0.0\",\"relationship\":\"dhcp-client-assertion\"}],\"ip_addresses\":[\"172.17.8.109\"],\"mac_addresses\":[\"14:fe:b5:d4:15:ca\",\"14:fe:b5:d4:15:ca,14:fe:b5:d4:15:ca\"],\"type\":\"hostname\",\"value\":\"Dunn-Windows-PC\"}",
            "start": 0,
            "reference": "/api/pcap/analyses/f4c6d05d-a600-4616-9c66-c96965645a65#identity/identity-675aea59cce673a367d74a49",
            "source_id": "S0007",
            "source_sha256": "93e97b88ae4d1ddbb8f77b138ecce457f0681728a2e728a9a99642e1722455a0"
          }
        ]
      },
      {
        "kind": "host",
        "text": "The host name Dunn-Windows-PC is associated with IP 172.17.8.109.",
        "basis": "observed",
        "value": "Dunn-Windows-PC",
        "evidence": [
          {
            "end": 355,
            "quote": "{\"bindings\":[{\"account\":\"\",\"frame_number\":409,\"owner_ip\":\"0.0.0.0\",\"relationship\":\"dhcp-client-assertion\"},{\"account\":\"\",\"frame_number\":1058,\"owner_ip\":\"0.0.0.0\",\"relationship\":\"dhcp-client-assertion\"}],\"ip_addresses\":[\"172.17.8.109\"],\"mac_addresses\":[\"14:fe:b5:d4:15:ca\",\"14:fe:b5:d4:15:ca,14:fe:b5:d4:15:ca\"],\"type\":\"hostname\",\"value\":\"Dunn-Windows-PC\"}",
            "start": 0,
            "reference": "/api/pcap/analyses/f4c6d05d-a600-4616-9c66-c96965645a65#identity/identity-675aea59cce673a367d74a49",
            "source_id": "S0007",
            "source_sha256": "93e97b88ae4d1ddbb8f77b138ecce457f0681728a2e728a9a99642e1722455a0"
          }
        ]
      },
      {
        "kind": "account",
        "text": "Account margaret.dunn initiated Kerberos authentication using 172.17.8.109.",
        "basis": "observed",
        "value": "margaret.dunn",
        "evidence": [
          {
            "end": 331,
            "quote": "{\"bindings\":[{\"account\":\"\",\"frame_number\":604,\"owner_ip\":\"172.17.8.109\",\"relationship\":\"kerberos-client-principal\"},{\"account\":\"\",\"frame_number\":612,\"owner_ip\":\"172.17.8.109\",\"relationship\":\"kerberos-client-principal\"}],\"ip_addresses\":[\"172.17.8.109\"],\"mac_addresses\":[\"14:fe:b5:d4:15:ca\"],\"type\":\"account\",\"value\":\"margaret.dunn\"}",
            "start": 0,
            "reference": "/api/pcap/analyses/f4c6d05d-a600-4616-9c66-c96965645a65#identity/identity-597ab227631a495ed4a21534",
            "source_id": "S0006",
            "source_sha256": "cacfd349857aaa19f09035c400c9569e01b5e640c0fe3666b07c4fdc3b5407c2"
          }
        ]
      }
    ],
    "next_steps": [
      {
        "text": "Review endpoint telemetry or host process logs from 172.17.8.109 to determine if the downloaded PE file was launched.",
        "basis": "assessment",
        "evidence": [
          {
            "end": 380,
            "quote": "{\"client_ip\":\"172.17.8.109\",\"completeness\":\"matches-declared-content-length\",\"content_kind\":\"pe\",\"match_basis\":\"exact-sha256-of-decoded-http-response-body\",\"request_frame\":802,\"response_frame\":983,\"server_ip\":\"91.121.30.169\",\"sha256\":\"9f6e3e65aedca997c6445329663bd1d279392a34cfda7d1b56461eb41641fa08\",\"url_without_query_or_fragment\":\"http://91.121.30.169:8000/91msE95B/actiV.bin\"}",
            "start": 0,
            "reference": "/api/pcap/analyses/f4c6d05d-a600-4616-9c66-c96965645a65#artifact/artifact-1e590e8c147fc278865188d5",
            "source_id": "S0004",
            "source_sha256": "dc8963b1b0646d359572918aa27922115e9bc3f023031fbaab5ea97fb8c12379"
          }
        ]
      }
    ],
    "uncertainties": [
      {
        "text": "It is not established by packet data whether the downloaded file 9f6e3e65aedca997c6445329663bd1d279392a34cfda7d1b56461eb41641fa08 executed or resulted in compromise on 172.17.8.109.",
        "basis": "observed",
        "evidence": [
          {
            "end": 380,
            "quote": "{\"client_ip\":\"172.17.8.109\",\"completeness\":\"matches-declared-content-length\",\"content_kind\":\"pe\",\"match_basis\":\"exact-sha256-of-decoded-http-response-body\",\"request_frame\":802,\"response_frame\":983,\"server_ip\":\"91.121.30.169\",\"sha256\":\"9f6e3e65aedca997c6445329663bd1d279392a34cfda7d1b56461eb41641fa08\",\"url_without_query_or_fragment\":\"http://91.121.30.169:8000/91msE95B/actiV.bin\"}",
            "start": 0,
            "reference": "/api/pcap/analyses/f4c6d05d-a600-4616-9c66-c96965645a65#artifact/artifact-1e590e8c147fc278865188d5",
            "source_id": "S0004",
            "source_sha256": "dc8963b1b0646d359572918aa27922115e9bc3f023031fbaab5ea97fb8c12379"
          }
        ]
      }
    ],
    "what_happened": [
      {
        "text": "Host 172.17.8.109 (Dunn-Windows-PC) downloaded an executable file identified as Portable Executable (PE) format from http://91.121.30.169:8000/91msE95B/actiV.bin during the capture period.",
        "basis": "observed",
        "evidence": [
          {
            "end": 380,
            "quote": "{\"client_ip\":\"172.17.8.109\",\"completeness\":\"matches-declared-content-length\",\"content_kind\":\"pe\",\"match_basis\":\"exact-sha256-of-decoded-http-response-body\",\"request_frame\":802,\"response_frame\":983,\"server_ip\":\"91.121.30.169\",\"sha256\":\"9f6e3e65aedca997c6445329663bd1d279392a34cfda7d1b56461eb41641fa08\",\"url_without_query_or_fragment\":\"http://91.121.30.169:8000/91msE95B/actiV.bin\"}",
            "start": 0,
            "reference": "/api/pcap/analyses/f4c6d05d-a600-4616-9c66-c96965645a65#artifact/artifact-1e590e8c147fc278865188d5",
            "source_id": "S0004",
            "source_sha256": "dc8963b1b0646d359572918aa27922115e9bc3f023031fbaab5ea97fb8c12379"
          }
        ]
      }
    ]
  },
  "validation": "schema-and-exact-quote-binding; not semantic proof",
  "word_count": 87,
  "analysis_id": "f4c6d05d-a600-4616-9c66-c96965645a65",
  "token_usage": {
    "total_tokens": 10295,
    "prompt_tokens": 9282,
    "completion_tokens": 1013
  },
  "authoritative": false,
  "effective_tlp": "TLP:CLEAR",
  "source_sha256": "232959ecfde73702ceb94ffbaac8de4b5b9d939715bbd2b3f3caca597c9bbf58",
  "capture_sha256": "2fc08b2bcdd1be009dab7cea877464e6ce9f93c65bc3e45b1583266e164408db",
  "prompt_version": "pcap-investigation-summary-v5",
  "requested_model": "gpt-4.1",
  "source_manifest": [
    {
      "kind": "packet_fact",
      "offset": 0,
      "sha256": "9d5bc6fa0a2b56e2ebf279fd8dd56f2c5bf67f59995ae5ef6eba27ec8aa4082e",
      "reference": "/api/pcap/analyses/f4c6d05d-a600-4616-9c66-c96965645a65#capture",
      "source_id": "S0001"
    },
    {
      "kind": "packet_fact",
      "offset": 0,
      "sha256": "5fc92b79b7f4b82933a7d835c15698de7154a7c177f01cc43af01eb309145eff",
      "reference": "/api/pcap/analyses/f4c6d05d-a600-4616-9c66-c96965645a65#coverage",
      "source_id": "S0002"
    },
    {
      "kind": "intelligence_lead",
      "offset": 0,
      "sha256": "148eed49de22dcf5acbde64f72027debc0f6ef2bb31551e38b83c7a5535517d1",
      "reference": "/api/pcap/analyses/f4c6d05d-a600-4616-9c66-c96965645a65#enrichment-coverage",
      "source_id": "S0003"
    },
    {
      "kind": "packet_fact",
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      "sha256": "dc8963b1b0646d359572918aa27922115e9bc3f023031fbaab5ea97fb8c12379",
      "reference": "/api/pcap/analyses/f4c6d05d-a600-4616-9c66-c96965645a65#artifact/artifact-1e590e8c147fc278865188d5",
      "source_id": "S0004"
    },
    {
      "kind": "packet_fact",
      "offset": 0,
      "sha256": "b15add919a63c6ee795f2522def801a71473d8ce04225784cf41ec170c69eaae",
      "reference": "/api/pcap/analyses/f4c6d05d-a600-4616-9c66-c96965645a65#identity/identity-7f49315307e32d7bad01e5e7",
      "source_id": "S0005"
    },
    {
      "kind": "packet_fact",
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      "sha256": "cacfd349857aaa19f09035c400c9569e01b5e640c0fe3666b07c4fdc3b5407c2",
      "reference": "/api/pcap/analyses/f4c6d05d-a600-4616-9c66-c96965645a65#identity/identity-597ab227631a495ed4a21534",
      "source_id": "S0006"
    },
    {
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      "sha256": "93e97b88ae4d1ddbb8f77b138ecce457f0681728a2e728a9a99642e1722455a0",
      "reference": "/api/pcap/analyses/f4c6d05d-a600-4616-9c66-c96965645a65#identity/identity-675aea59cce673a367d74a49",
      "source_id": "S0007"
    },
    {
      "kind": "rule_candidate",
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    }
  ],
  "token_usage_note": "Provider-reported counts when available; never estimated from character length.",
  "generation_seconds": 69.931,
  "generation_attempts": [
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      "validation": "uncited_identifier",
      "token_usage": {
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        "prompt_tokens": 4514,
        "completion_tokens": 609,
        "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"
    },
    {
      "attempt": 2,
      "validation": "passed",
      "token_usage": {
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        "prompt_tokens": 4768,
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        "prompt_tokens_details": {
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      "finish_reason": "stop",
      "provider_returned_model": "gpt-4.1-2025-04-14"
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  ],
  "validation_adjustments": [],
  "provider_returned_model": "gpt-4.1-2025-04-14"
}