ADAudit Plus Network Policy Server Access Denial Burst
Detects repeated network policy access denials. NPS governs RADIUS-based access to VPN and wireless, so a burst of denials for one identity is credential testing against the remote access perimeter — often the first move against an organisation from outside. Onboarding: MANAGE-ENGINE-ADAUDIT-PLUS is ingested via Syslog (KV) (Bloo extractor 830). Integration guide: https://bloo.io/docs/hypercloud/syslog-connector BQL (Bloo Query Language): stream=win-audit where sourcename='MANAGE-ENGINE-ADAUDIT-PLUS' and action='NPS_USER_DENIED' | duration 15m | groupby user, networkpolicyname, reasoncode | select user, networkpolicyname, reasoncode, count(*) as cnt | having cnt > 10
Sigma

