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Certificate Anomaly

Medium Resolved
ALR-00027 · 2026-04-10T00:10:49Z

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-00027
Timestamp
2026-04-10T00:10:49Z
Severity
Medium
Status
Resolved
Detection Source
DLP Module
Assigned Analyst
Emma Richardson

Endpoint Information

Hostname
SRV-DC-01
User Account
h.roberts
Source IP
91.130.195.141
Destination IP
10.1.136.172
Origin Country
KP North Korea

MITRE ATT&CK Mapping

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

Investigation Timeline

00:10:49 Event ingested by SOC365 Engine
00:10:53 EmilyAI triage started — correlation enrichment
00:11:04 EmilyAI confidence: 96% — escalated to human analyst
00:11:32 Alert assigned to analyst: Emma Richardson
00:13:41 Investigation started — querying SIEM and threat intelligence
00:15:40 Containment action taken — endpoint isolated
00:29:22 Alert resolved — remediation complete

Related Alerts

ID Time Alert Severity Status Host
ALR-00110 32m ago Unauthorised USB Device Low False Positive SRV-DC-01
ALR-00299 2h ago Phishing Email Blocked Medium False Positive SRV-DC-01
ALR-00018 6h ago Certificate Anomaly Informational Resolved WS-LAP-012
ALR-00202 7h ago Privilege Escalation Attempt Informational Resolved SRV-DC-01
ALR-00259 9h ago Brute Force SSH Low Resolved SRV-DC-01