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Certificate Anomaly

High Open
ALR-00339 · 2026-10-08T05:45:08Z

Description

TLS certificate anomaly detected on WS-PC-002. Self-signed certificate on port 443 does not match expected corporate CA chain.

Alert Metadata

Alert ID
ALR-00339
Timestamp
2026-10-08T05:45:08Z
Severity
High
Status
Open
Detection Source
Email Gateway
Assigned Analyst
Emma Richardson

Endpoint Information

Hostname
WS-PC-002
User Account
s.jones
Source IP
103.23.216.78
Destination IP
10.0.253.81
Origin Country
FR France

MITRE ATT&CK Mapping

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

Investigation Timeline

05:45:08 Event ingested by SOC365 Engine
05:45:09 EmilyAI triage started — correlation enrichment
05:45:18 EmilyAI confidence: 96% — escalated to human analyst
05:45:50 Alert assigned to analyst: Emma Richardson
05:47:19 Investigation started — querying SIEM and threat intelligence

Related Alerts

ID Time Alert Severity Status Host
ALR-00440 1h ago Lateral Movement Detected Informational Open WS-PC-002
ALR-00073 1h ago Unusual Outbound Traffic Medium Resolved WS-PC-002
ALR-00280 7h ago Certificate Anomaly Medium Resolved SRV-BACKUP-01
ALR-00035 10h ago Unusual Outbound Traffic Medium Investigating WS-PC-002
ALR-00385 10h ago Certificate Anomaly Medium Escalated SRV-DC-01