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Unauthorised USB Device

Medium Resolved
ALR-00335 · 2026-07-08T03:31:33Z

Description

Unauthorised USB mass storage device connected to SRV-WEB-01 by user 'l.johnson'. Device blocked by Firewall endpoint policy.

Alert Metadata

Alert ID
ALR-00335
Timestamp
2026-07-08T03:31:33Z
Severity
Medium
Status
Resolved
Detection Source
Firewall
Assigned Analyst
Emma Richardson

Endpoint Information

Hostname
SRV-WEB-01
User Account
l.johnson
Source IP
91.47.195.83
Destination IP
10.1.206.67
Origin Country
UA Ukraine

MITRE ATT&CK Mapping

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

Investigation Timeline

03:31:33 Event ingested by SOC365 Engine
03:31:34 EmilyAI triage started — correlation enrichment
03:31:44 EmilyAI confidence: 98% — escalated to human analyst
03:32:08 Alert assigned to analyst: Emma Richardson
03:33:08 Investigation started — querying SIEM and threat intelligence
03:40:53 Containment action taken — endpoint isolated
03:41:49 Alert resolved — remediation complete

Related Alerts

ID Time Alert Severity Status Host
ALR-00421 1h ago Unauthorised USB Device High Escalated WS-PC-001
ALR-00209 2h ago Unauthorised USB Device Medium Investigating SRV-SQL-01
ALR-00272 2h ago Certificate Anomaly Informational Investigating SRV-WEB-01
ALR-00286 12h ago Unauthorised USB Device Medium Escalated VM-DEV-01
ALR-00450 23h ago Unauthorised USB Device Low False Positive SRV-FILE-01