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Certificate Anomaly

Medium Investigating
ALR-00338 · 2026-04-11T05:26:13Z

Description

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

Alert Metadata

Alert ID
ALR-00338
Timestamp
2026-04-11T05:26:13Z
Severity
Medium
Status
Investigating
Detection Source
Firewall
Assigned Analyst
Anika Patel

Endpoint Information

Hostname
SRV-MAIL-01
User Account
c.williams
Source IP
185.217.220.56
Destination IP
10.0.119.145
Origin Country
CN China

MITRE ATT&CK Mapping

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

Investigation Timeline

05:26:13 Event ingested by SOC365 Engine
05:26:16 EmilyAI triage started — correlation enrichment
05:26:26 EmilyAI confidence: 89% — escalated to human analyst
05:26:35 Alert assigned to analyst: Anika Patel
05:28:17 Investigation started — querying SIEM and threat intelligence

Related Alerts

ID Time Alert Severity Status Host
ALR-00342 4m ago Certificate Anomaly Low Open WS-LAP-011
ALR-00111 3h ago Suspicious Scheduled Task Low Open SRV-MAIL-01
ALR-00439 4h ago Certificate Anomaly Medium False Positive SW-CORE-01
ALR-00328 5h ago Certificate Anomaly Low False Positive WS-PC-001
ALR-00029 17h ago Phishing Email Blocked Low Resolved SRV-MAIL-01