Ping Federate - Unusual mail domain.

Requête originale, sans modification.

let known_domains = 
PingFederateEvent
| where TimeGenerated between (ago(14d) .. (1d))
| extend email = extract(@'email=(.*?),.*', 1, AdditionalExtensions)
| extend m_domain = extract(@'@(.*)', 1, email)
| where isnotempty(m_domain)
| summarize makeset(m_domain);
PingFederateEvent
| extend email = extract(@'email=(.*?),.*', 1, AdditionalExtensions)
| extend m_domain = extract(@'@(.*)', 1, email)
| where isnotempty(m_domain)
| where m_domain !in (known_domains)
| extend AccountCustomEntity = DstUserName
| extend IpCustomEntity = SrcIpAddr