Incident: Analyst-selected activity for investigation

Verdict

This system does not compute a confidence score for its verdict. The evidence basis is a count of what was checked, not a measure of how likely the verdict is.

Investigation Tree

• Initial alert: Analyst-selected activity for investigation
  rules ANALYST-SEED; 1 seed event(s): wlb-process-0001058
• ↓
• ATH investigation (engine deterministic)
  • endpoint
    why only eligible specialist; case evidence rests on process_command_line, process_execution, process_lineage telemetry (from ANALYST-SEED)
    tools get_events, process_tree
    new events 2 retrieved; shown: wlb-process-0001057, wlb-process-0001055
  • evidence_verifier
    why validate typed observations against cited telemetry
  stopped: no specialist has further useful work on the available evidence
• ↓
• Verdict: Abstain

Reasoning Summary

No model-written reasoning: this run used no model. Its reasoning is the specialist trace in the investigation tree and the findings below.

Executive Summary

This report covers CASE-SEED, correlating 1 detection finding(s) across 1 host(s) (CLIENT1) and 1 account(s) (client1) between 15:02:06 and 15:02:06 UTC on 2024-12-28. 5 statement(s) below are directly established by telemetry, 2 are evidence-supported inferences, and 0 are explicitly unverified hypotheses requiring analyst confirmation. This report does not authorise or perform any response action. All recommendations below require human review before action is taken.

Attack Timeline

Findings

Confirmed (FACT) (5)

• Confirmed: Event wlb-process-0001055 records process identity sysmon:416dd0c5-12ed-6770-2604-000000000c00.
  Evidence: wlb-process-0001055
• Confirmed: Event wlb-process-0001057 records process identity sysmon:416dd0c5-12ee-6770-2804-000000000c00.
  Evidence: wlb-process-0001057
• Confirmed: Event wlb-process-0001058 records process identity sysmon:416dd0c5-12ee-6770-2904-000000000c00.
  Evidence: wlb-process-0001058
• Confirmed: Process event wlb-process-0001057 identifies the instance in wlb-process-0001055 as its parent.
  Evidence: wlb-process-0001055, wlb-process-0001057
• Confirmed: Process event wlb-process-0001058 identifies the instance in wlb-process-0001057 as its parent.
  Evidence: wlb-process-0001057, wlb-process-0001058

Assessed (INFERENCE) (2)

• Assessed: Unverified summary: On CLIENT1, firefox.exe (PID 9284) was started by firefox.exe under account client1.
  Evidence: wlb-process-0001058
• Assessed: Unverified summary: Execution chain on CLIENT1: - -> cmd.exe -> firefox.exe -> firefox.exe.
  Evidence: wlb-process-0001058, wlb-process-0001057, wlb-process-0001055

Unconfirmed Hypotheses (0)

• None.

Recommended Next Steps

Investigative recommendations for a human analyst. No response action has been taken or is authorised by this report.

1. Retrieve email gateway or web-proxy logs to establish the initial access vector.
   Rationale: No detection in this case targets initial access, so the delivery mechanism (e.g. a phishing attachment) is inferred from process lineage rather than confirmed from delivery telemetry.
   Based on: MITRE ATT&CK tactic coverage gap: Initial Access
2. Escalate to a human analyst for validation before any remediation action is taken.
   Rationale: This system performs read-only investigation only. It has no capability to disable accounts, isolate hosts, or otherwise remediate, and this report is not authorisation to do so.
   Based on: system design constraint

Limitations & Scope

• Telemetry underlying this report came from: winlogbeat. Field coverage depends entirely on what the originating export or sensor captured; this project's canonical schema does not model every field a real EDR product exposes (e.g. file hashes, signer information, session identifiers), and any of those were dropped during normalization.
• ATT&CK mappings are interpretations of observed behaviour against a public taxonomy. They indicate that behaviour is consistent with a technique, not that an adversary performed it.
• Grouping confidence describes how strongly correlated findings are linked to each other, not whether an intrusion occurred.
• No evidence was found for the following ATT&CK tactics: Initial Access, Discovery, Credential Access, Lateral Movement, Collection, Exfiltration. Their absence may reflect that the activity did not occur, or that available telemetry cannot observe it.
• Typed predicates are checked against recorded telemetry; free-text interpretations are not semantically verified. Missing identity is not a confirmed process link, and recorded event order does not establish causation.

Investigation Trace

Agents run: endpoint; tool calls made: 2

• step 1: endpoint -- only eligible specialist; case evidence rests on process_command_line, process_execution, process_lineage telemetry (from ANALYST-SEED)
• step 2: stop -- no specialist has further useful work on the available evidence
• evidence verification: 5 checked observations; 2 summaries reclassified

Evidence Appendix

All 3 telemetry events underlying this report, chronologically.