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Failed MFA Challenge

Informational Resolved
ALR-00026 · 2026-05-21T07:42:06Z

Description

Multiple failed MFA challenges for user 'f.hall' — 12 push notifications in 3 minutes suggesting MFA fatigue attack. Email Gateway locked account.

Alert Metadata

Alert ID
ALR-00026
Timestamp
2026-05-21T07:42:06Z
Severity
Informational
Status
Resolved
Detection Source
Email Gateway
Assigned Analyst
EmilyAI (auto)

Endpoint Information

Hostname
SRV-SQL-01
User Account
f.hall
Source IP
91.48.195.144
Destination IP
10.3.147.140
Origin Country
UA Ukraine

MITRE ATT&CK Mapping

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

Investigation Timeline

07:42:06 Event ingested by SOC365 Engine
07:42:10 EmilyAI triage started — correlation enrichment
07:42:21 EmilyAI confidence: 97% — escalated to human analyst
07:42:34 Alert assigned to analyst: EmilyAI (auto)
07:43:18 Investigation started — querying SIEM and threat intelligence
07:45:41 Containment action taken — endpoint isolated
07:59:53 Alert resolved — remediation complete

Related Alerts

ID Time Alert Severity Status Host
ALR-00223 2h ago C2 Beacon Activity Medium False Positive SRV-SQL-01
ALR-00079 10h ago Kerberoasting Attempt High Investigating SRV-SQL-01
ALR-00327 15h ago Insider Threat Indicator Low Resolved SRV-SQL-01
ALR-00431 23h ago Failed MFA Challenge Low False Positive WS-LAP-010
ALR-00044 1d ago Certificate Anomaly Low Resolved SRV-SQL-01