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Rogue DHCP Server

High Investigating
ALR-00164 · 2026-05-27T09:23:03Z

Description

Rogue DHCP server detected on VLAN 10 from SRV-MAIL-01. Offering IPs in unexpected range. Email Gateway quarantined the device.

Alert Metadata

Alert ID
ALR-00164
Timestamp
2026-05-27T09:23:03Z
Severity
High
Status
Investigating
Detection Source
Email Gateway
Assigned Analyst
Marcus Webb

Endpoint Information

Hostname
SRV-MAIL-01
User Account
m.taylor
Source IP
45.150.148.173
Destination IP
10.1.128.54
Origin Country
IR Iran

MITRE ATT&CK Mapping

Tactic
Discovery
Technique
T1557.003
Reference
attack.mitre.org/techniques/T1557.003

Investigation Timeline

09:23:03 Event ingested by SOC365 Engine
09:23:04 EmilyAI triage started — correlation enrichment
09:23:18 EmilyAI confidence: 93% — escalated to human analyst
09:23:38 Alert assigned to analyst: Marcus Webb
09:24:38 Investigation started — querying SIEM and threat intelligence

Related Alerts

ID Time Alert Severity Status Host
ALR-00375 2h ago Phishing Email Blocked Low Open SRV-MAIL-01
ALR-00039 3h ago C2 Beacon Activity Low Escalated SRV-MAIL-01
ALR-00200 4h ago Rogue DHCP Server Informational False Positive SRV-FILE-01
ALR-00371 5h ago Rogue DHCP Server Low False Positive SW-CORE-01
ALR-00025 7h ago Rogue DHCP Server Medium False Positive WS-LAP-011