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Rogue DHCP Server

High Open
ALR-00251 · 2026-10-06T14:10:17Z

Description

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

Alert Metadata

Alert ID
ALR-00251
Timestamp
2026-10-06T14:10:17Z
Severity
High
Status
Open
Detection Source
Firewall
Assigned Analyst
Marcus Webb

Endpoint Information

Hostname
SRV-FILE-01
User Account
d.walker
Source IP
194.86.62.35
Destination IP
10.3.187.53
Origin Country
US United States

MITRE ATT&CK Mapping

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

Investigation Timeline

14:10:17 Event ingested by SOC365 Engine
14:10:20 EmilyAI triage started — correlation enrichment
14:10:23 EmilyAI confidence: 85% — escalated to human analyst
14:10:43 Alert assigned to analyst: Marcus Webb
14:11:56 Investigation started — querying SIEM and threat intelligence

Related Alerts

ID Time Alert Severity Status Host
ALR-00064 4h ago Brute Force SSH High Open SRV-FILE-01
ALR-00395 16h ago Credential Stuffing Attempt Informational False Positive SRV-FILE-01
ALR-00436 18h ago Rogue DHCP Server Medium Open WS-LAP-012
ALR-00200 1d ago Rogue DHCP Server Low Escalated WS-LAP-010
ALR-00233 1d ago Kerberoasting Attempt Low Open SRV-FILE-01