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Unauthorised USB Device

Medium Escalated
ALR-00399 · 2026-05-25T16:02:53Z

Description

Unauthorised USB mass storage device connected to WS-PC-006 by user 'r.davies'. Device blocked by Email Gateway endpoint policy.

Alert Metadata

Alert ID
ALR-00399
Timestamp
2026-05-25T16:02:53Z
Severity
Medium
Status
Escalated
Detection Source
Email Gateway
Assigned Analyst
Sarah Chen

Endpoint Information

Hostname
WS-PC-006
User Account
r.davies
Source IP
91.188.195.230
Destination IP
10.3.16.134
Origin Country
RO Romania

MITRE ATT&CK Mapping

Tactic
Initial Access
Technique
T1091
Reference
attack.mitre.org/techniques/T1091

Investigation Timeline

16:02:53 Event ingested by SOC365 Engine
16:02:54 EmilyAI triage started — correlation enrichment
16:03:05 EmilyAI confidence: 98% — escalated to human analyst
16:03:23 Alert assigned to analyst: Sarah Chen
16:03:48 Investigation started — querying SIEM and threat intelligence
16:06:58 Containment action taken — endpoint isolated
16:14:52 Alert resolved — remediation complete

Related Alerts

ID Time Alert Severity Status Host
ALR-00070 3h ago Unauthorised USB Device Informational Escalated WS-LAP-012
ALR-00311 5h ago Credential Stuffing Attempt Low False Positive WS-PC-006
ALR-00310 9h ago Unauthorised USB Device Medium Investigating SRV-DC-01
ALR-00265 10h ago Unauthorised USB Device High Escalated FW-EDGE-01
ALR-00302 16h ago Lateral Movement Detected Low False Positive WS-PC-006