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Failed MFA Challenge

High Open
ALR-00053 · 2026-05-27T09:17:16Z

Description

Multiple failed MFA challenges for user 'c.williams' — 12 push notifications in 3 minutes suggesting MFA fatigue attack. Firewall locked account.

Alert Metadata

Alert ID
ALR-00053
Timestamp
2026-05-27T09:17:16Z
Severity
High
Status
Open
Detection Source
Firewall
Assigned Analyst
Marcus Webb

Endpoint Information

Hostname
WS-PC-001
User Account
c.williams
Source IP
103.83.216.107
Destination IP
10.3.177.179
Origin Country
GB United Kingdom

MITRE ATT&CK Mapping

Tactic
Credential Access
Technique
T1621
Reference
attack.mitre.org/techniques/T1621

Investigation Timeline

09:17:16 Event ingested by SOC365 Engine
09:17:20 EmilyAI triage started — correlation enrichment
09:17:26 EmilyAI confidence: 78% — escalated to human analyst
09:17:32 Alert assigned to analyst: Marcus Webb
09:19:52 Investigation started — querying SIEM and threat intelligence

Related Alerts

ID Time Alert Severity Status Host
ALR-00205 1h ago Malware Signature Match Low Investigating WS-PC-001
ALR-00469 2h ago Failed MFA Challenge Medium Investigating SRV-BACKUP-01
ALR-00438 3h ago Failed MFA Challenge Low False Positive WS-PC-006
ALR-00008 8h ago Failed MFA Challenge Medium Investigating WS-PC-003
ALR-00478 8h ago Pass-the-Hash Detected High Open WS-PC-001