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Failed MFA Challenge

Medium Open
ALR-00331 · 2026-07-11T06:58:42Z

Description

Multiple failed MFA challenges for user 'system' — 12 push notifications in 3 minutes suggesting MFA fatigue attack. EmilyAI Triage locked account.

Alert Metadata

Alert ID
ALR-00331
Timestamp
2026-07-11T06:58:42Z
Severity
Medium
Status
Open
Detection Source
EmilyAI Triage
Assigned Analyst
Emma Richardson

Endpoint Information

Hostname
SRV-DC-01
User Account
system
Source IP
103.151.216.231
Destination IP
10.0.209.156
Origin Country
US United States

MITRE ATT&CK Mapping

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

Investigation Timeline

06:58:42 Event ingested by SOC365 Engine
06:58:45 EmilyAI triage started — correlation enrichment
06:58:47 EmilyAI confidence: 94% — escalated to human analyst
06:59:01 Alert assigned to analyst: Emma Richardson
07:01:12 Investigation started — querying SIEM and threat intelligence

Related Alerts

ID Time Alert Severity Status Host
ALR-00090 31m ago Privilege Escalation Attempt High Investigating SRV-DC-01
ALR-00218 1h ago Failed MFA Challenge Low Open WS-LAP-010
ALR-00109 2h ago Rogue DHCP Server Medium Investigating SRV-DC-01
ALR-00145 5h ago Failed MFA Challenge High Escalated SW-CORE-01
ALR-00043 6h ago Ransomware Behaviour Detected Medium False Positive SRV-DC-01