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Certificate Anomaly

Medium Resolved
ALR-00212 · 2026-04-09T16:09:23Z

Description

TLS certificate anomaly detected on SRV-DC-01. Self-signed certificate on port 443 does not match expected corporate CA chain.

Alert Metadata

Alert ID
ALR-00212
Timestamp
2026-04-09T16:09:23Z
Severity
Medium
Status
Resolved
Detection Source
Endpoint Agent
Assigned Analyst
James Okonkwo

Endpoint Information

Hostname
SRV-DC-01
User Account
system
Source IP
45.80.148.129
Destination IP
10.2.237.253
Origin Country
KP North Korea

MITRE ATT&CK Mapping

Tactic
Defence Evasion
Technique
T1553.004
Reference
attack.mitre.org/techniques/T1553.004

Investigation Timeline

16:09:23 Event ingested by SOC365 Engine
16:09:26 EmilyAI triage started — correlation enrichment
16:09:33 EmilyAI confidence: 97% — escalated to human analyst
16:10:00 Alert assigned to analyst: James Okonkwo
16:10:20 Investigation started — querying SIEM and threat intelligence
16:16:16 Containment action taken — endpoint isolated
16:24:21 Alert resolved — remediation complete

Related Alerts

ID Time Alert Severity Status Host
ALR-00055 11h ago Certificate Anomaly High Investigating WS-PC-003
ALR-00301 20h ago Certificate Anomaly Medium Investigating SRV-BACKUP-01
ALR-00423 1d ago Unauthorised USB Device Informational False Positive SRV-DC-01
ALR-00468 1d ago Unusual Outbound Traffic Medium Escalated SRV-DC-01
ALR-00303 1d ago Suspicious PowerShell Execution High Escalated SRV-DC-01