ALT-2413 · Entra ID
Password spray against Entra ID tenant
142 failed sign-ins across 61 distinct accounts from 4 source IPs in a 9 minute window, followed by one success.
Detection summary
142 failed sign-ins across 61 distinct accounts from 4 source IPs in a 9 minute window, followed by one success.
- Affected host
- SRV-DC-01
- Affected user
- r.wijaya
- Source IP
- 10.20.10.77
- Detection rule
- DET-0087 Distributed Authentication Failure Burst
- Log source
- Entra ID
- Assignee
- Unassigned
Recommended actions
- Force password reset for the successfully authenticated account
- Enable conditional access blocking legacy auth
- Add source IP ranges to the identity blocklist
Analyst decision
Triage checklist
- 1. Confirm the detection logic matched genuine activity.
- 2. Check user and asset context for expected behaviour.
- 3. Pivot on host, user, IP and hash in the Log Explorer.
- 4. Enrich IOCs with threat intelligence.
- 5. Set a verdict and record your reasoning.
Learn this capability
Hands-on labs that build the technique behind this workspace. Skills transfer to any mainstream SIEM.
Foundation · Theory · 12 min
What a SOC actually does
You have just joined the ACME-CORP SOC as an L1 analyst on the morning shift. Before touching the queue you need to understand how work flows through the team and where your responsibility starts and ends.
Foundation · Simulation · 40 min
Triage 20 alerts against the clock
It is 09:00 and the queue built up overnight. You have a shift's worth of alerts and limited time. Work the queue: confirm what matters, dismiss what does not, and escalate anything that is beyond L1.
Entry · Theory · 16 min
Speaking ATT&CK
Three critical alerts are open. Each describes a different attacker goal. To discuss them with anyone else in security you need the ATT&CK vocabulary.