Training scenario: All event details below are simulated. The source IP
203.0.113.45belongs to a documentation-only address range and is not a real threat intelligence indicator.
Objective
Practice a Tier 1 SOC workflow: review an authentication alert, correlate Windows Security events, distinguish suspicious activity from confirmed compromise, and document an escalation recommendation.
Initial Alert
| Field | Value |
|---|---|
| Alert ID | ALERT-001 |
| Initial severity | Medium |
| Affected host | WIN-SRV-01 |
| Target account | admin |
| Source IP | 203.0.113.45 |
| Observation | 18 failed logons in five minutes |
| Initial successful logon status | Not yet verified |
The first analyst decision was to investigate authentication records rather than close the alert, immediately block the IP, or escalate without evidence.
Evidence and Timeline
The simulation subsequently provided the following correlated events:
| Time | Event ID | Observation |
|---|---|---|
| 09:00–09:05 | 4625 | 18 failed logons against admin |
| 09:06 | 4624 | Successful logon for admin; Logon Type 10 |
| 09:07 | 4672 | Special privileges assigned to the associated logon session |
The failed and successful authentication events share the same source IP, 203.0.113.45. The 4672 event was linked to the successful logon through the same Logon ID.
Event Interpretation
- 4625 — Failed logon: Repeated failures may indicate password guessing, but the event alone does not establish malicious intent.
- 4624 — Successful logon: Logon Type
10indicates a remote interactive session, commonly associated with Remote Desktop Services. - 4672 — Special privileges assigned: This can occur during legitimate privileged logons. It is not, by itself, proof of account compromise.
Analyst Assessment
Working classification: Suspicious authentication activity — possible password-guessing or brute-force sequence followed by successful access.
Triage severity: High (scenario assessment, not an automatically calculated score).
Compromise status: Unconfirmed.
The strongest concern is the sequence of repeated failed logons, a successful remote interactive logon from the same source, and a privileged logon event associated with that session. However, authorization and post-logon behavior have not yet been established.
Recommended Tier 1 Actions
- Verify the successful session with the account owner or authorized operations team.
- Review post-authentication activity, including process execution, administrative actions, and relevant endpoint telemetry.
- Preserve original log records, timestamps, source fields, and session identifiers.
- Check whether the source and access pattern match an approved administrative workflow.
- Escalate the evidence and timeline to SOC Tier 2 under the organization’s escalation procedure.
Containment: No account disablement, host isolation, or IP blocking was performed in this simulation. Such actions require appropriate evidence and authorization under the incident-response playbook.
Example Triage Handoff
| Field | Analyst note |
|---|---|
| Alert | ALERT-001 |
| Priority | High |
| Observed activity | 18 failed logons followed by successful remote interactive logon and linked privileged logon event |
| Evidence | Windows Security Event IDs 4625, 4624, 4672; source IP and Logon ID correlation |
| Impact | Unknown; unauthorized access not confirmed |
| Disposition | Escalation recommended |
| Next investigation | Validate authorization and inspect post-logon activity |
Lessons Learned
- Correlate before concluding. A sequence of events is more informative than any single Event ID.
- Separate evidence from inference. Suspicious authentication does not automatically mean confirmed compromise.
- Document the reason for priority. A High rating should be supported by observable facts and organizational criteria.
- Hand off actionable context. Tier 2 needs a clear timeline, identifiers, open questions, and recommended next steps.
References
ORIONINSIST — Work Smarter. Prove It.