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Failed MFA Challenge

Medium Resolved
ALR-00195 · 2026-04-11T12:30:33Z

Description

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

Alert Metadata

Alert ID
ALR-00195
Timestamp
2026-04-11T12:30:33Z
Severity
Medium
Status
Resolved
Detection Source
DecoyPulse
Assigned Analyst
Sarah Chen

Endpoint Information

Hostname
SRV-BACKUP-01
User Account
f.hall
Source IP
185.169.220.26
Destination IP
10.2.116.198
Origin Country
NL Netherlands

MITRE ATT&CK Mapping

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

Investigation Timeline

12:30:33 Event ingested by SOC365 Engine
12:30:38 EmilyAI triage started — correlation enrichment
12:30:48 EmilyAI confidence: 81% — escalated to human analyst
12:31:07 Alert assigned to analyst: Sarah Chen
12:32:08 Investigation started — querying SIEM and threat intelligence
12:39:09 Containment action taken — endpoint isolated
12:41:20 Alert resolved — remediation complete

Related Alerts

ID Time Alert Severity Status Host
ALR-00032 3h ago Suspicious PowerShell Execution Medium Escalated SRV-BACKUP-01
ALR-00186 6h ago Suspicious PowerShell Execution Informational Resolved SRV-BACKUP-01
ALR-00108 6h ago Unusual Outbound Traffic Medium Open SRV-BACKUP-01
ALR-00441 10h ago Privilege Escalation Attempt Medium Escalated SRV-BACKUP-01
ALR-00187 12h ago Failed MFA Challenge Medium Investigating SRV-BACKUP-01