# Incident: Analyst-selected activity for investigation

**Case:** CASE-SEED  
**Generated:** 2026-09-26 11:09:52 UTC  
**Status:** complete  
**Severity:** MEDIUM  |  **Grouping confidence:** low  
**Hosts:** CLIENT2  
**Accounts:** client2  
**Window:** 2025-01-07 08:23:26 -> 08:23:26 UTC (0s)

> This report was produced by an automated investigation over telemetry from: **winlogbeat**. It presents evidence-backed findings for analyst review and does not authorise or perform any response action.

## Verdict

**Disposition:** Abstain  
**Engine:** deterministic  |  **Profile:** operational-v6  |  **Model:** none (deterministic engine)  
**Decided by:** deterministic triage of the seed findings  
**Evidence basis:** 7 typed observation(s) checked against recorded telemetry; 0 claim(s) rejected by verification; 1 specialist step(s) run (endpoint); 2 tool call(s) served, 0 refused.  
**Supporting event ids:** none cited by the concluding explanations.

*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

```text
Initial alert: Analyst-selected activity for investigation
  rules ANALYST-SEED; 1 seed event(s): wlb-process-0004946
  ↓
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: 3 retrieved; shown: wlb-process-0004817, wlb-process-0004816, wlb-process-0005022
  └── 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) (CLIENT2) and 1 account(s) (client2) between 08:23:26 and 08:23:26 UTC on 2025-01-07. 7 statement(s) below are directly established by telemetry, 3 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

| Time | Rule | Severity | User | Host / Movement | ATT&CK | Events |
| --- | --- | --- | --- | --- | --- | --- |
| 08:23:26 | ANALYST-SEED | MEDIUM | client2 | CLIENT2 | - | wlb-process-0004946 |

## Findings

### Confirmed (FACT) (7)

*Typed observations checked against recorded telemetry.*

- Confirmed: Event wlb-process-0004816 records process identity sysmon:416dd0c5-e467-677c-6400-000000001200.
  - Evidence: `wlb-process-0004816`
- Confirmed: Event wlb-process-0004817 records process identity sysmon:416dd0c5-e467-677c-6500-000000001200.
  - Evidence: `wlb-process-0004817`
- Confirmed: Event wlb-process-0004946 records process identity sysmon:416dd0c5-e47e-677c-9000-000000001200.
  - Evidence: `wlb-process-0004946`
- Confirmed: Event wlb-process-0005022 records process identity sysmon:416dd0c5-e483-677c-9d00-000000001200.
  - Evidence: `wlb-process-0005022`
- Confirmed: Process event wlb-process-0004817 identifies the instance in wlb-process-0004816 as its parent.
  - Evidence: `wlb-process-0004816, wlb-process-0004817`
- Confirmed: Process event wlb-process-0004946 identifies the instance in wlb-process-0004817 as its parent.
  - Evidence: `wlb-process-0004817, wlb-process-0004946`
- Confirmed: Process event wlb-process-0005022 identifies the instance in wlb-process-0004946 as its parent.
  - Evidence: `wlb-process-0004946, wlb-process-0005022`

### Assessed (INFERENCE) (3)

*Interpretations and summaries; citation or predicate checks do not verify their free-text meaning.*

- Assessed: Unverified summary: On CLIENT2, svcmon.exe (PID 6912) was started by explorer.exe under account client2.
  - Evidence: `wlb-process-0004946`
- Assessed: Unverified summary: Execution chain on CLIENT2: winlogon.exe -> userinit.exe -> explorer.exe -> svcmon.exe.
  - Evidence: `wlb-process-0004946, wlb-process-0004817, wlb-process-0004816`
- Assessed: Unverified summary: svcmon.exe (PID 6912) on CLIENT2 spawned 1 child process(es): svcmon.exe.
  - Evidence: `wlb-process-0005022`

### Unconfirmed Hypotheses (0)

*Possible explanations that have NOT been verified. Treat as open questions for the analyst, not as findings.*

_None._

## Evidence Checks

7 typed observations verified; 3 unstructured summaries retained as interpretations.

Predicate support does not establish malicious intent or verify the accompanying prose.

## Recommended Next Steps

*These are 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: 7 checked observations; 3 summaries reclassified

## Evidence Appendix

All 4 telemetry events underlying this report, chronologically. Every claim above cites specific event ids from this list.

| Event ID | Time | Device | User | Summary |
| --- | --- | --- | --- | --- |
| `wlb-process-0004816` | 08:23:03 | CLIENT2 | client2 | winlogon.exe -> userinit.exe \| C:\Windows\system32\userinit.exe |
| `wlb-process-0004817` | 08:23:03 | CLIENT2 | client2 | userinit.exe -> explorer.exe \| C:\Windows\Explorer.EXE |
| `wlb-process-0004946` | 08:23:26 | CLIENT2 | client2 | explorer.exe -> svcmon.exe \| "C:\Users\client2\AppData\Local\Temp\svcmon.exe"  |
| `wlb-process-0005022` | 08:23:31 | CLIENT2 | client2 | svcmon.exe -> svcmon.exe \| "C:\Users\client2\AppData\Local\Temp\svcmon.exe"  |