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Unauthorised USB Device

Medium Escalated
ALR-00421 · 2026-07-09T18:37:31Z

Description

Unauthorised USB mass storage device connected to WS-PC-003 by user 'n.clark'. Device blocked by SOC365 Engine endpoint policy.

Alert Metadata

Alert ID
ALR-00421
Timestamp
2026-07-09T18:37:31Z
Severity
Medium
Status
Escalated
Detection Source
SOC365 Engine
Assigned Analyst
Marcus Webb

Endpoint Information

Hostname
WS-PC-003
User Account
n.clark
Source IP
103.29.216.203
Destination IP
10.1.217.11
Origin Country
RU Russia

MITRE ATT&CK Mapping

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

Investigation Timeline

18:37:31 Event ingested by SOC365 Engine
18:37:34 EmilyAI triage started — correlation enrichment
18:37:36 EmilyAI confidence: 82% — escalated to human analyst
18:37:56 Alert assigned to analyst: Marcus Webb
18:39:11 Investigation started — querying SIEM and threat intelligence
18:42:08 Containment action taken — endpoint isolated
18:52:53 Alert resolved — remediation complete

Related Alerts

ID Time Alert Severity Status Host
ALR-00269 45m ago Unauthorised USB Device High Investigating FW-EDGE-01
ALR-00441 3h ago Suspicious PowerShell Execution Informational Open WS-PC-003
ALR-00108 4h ago Data Exfiltration Attempt Medium Open WS-PC-003
ALR-00451 5h ago Suspicious PowerShell Execution Medium Open WS-PC-003
ALR-00059 7h ago Unauthorised USB Device High Investigating SRV-FILE-01