Ping Federate - Unexpected authentication URL

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Id	9578ef7f-cbb4-4e9a-bd26-37c15c53b413
Rulename	Ping Federate - Unexpected authentication URL.
Description	Detects unexpected authentication URL.
Severity	Medium
Tactics	InitialAccess
Techniques	T1078
Required data connectors	CefAma
Kind	Scheduled
Query frequency	1h
Query period	14d
Trigger threshold	0
Trigger operator	gt
Source Uri	https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/PingFederate/Analytic Rules/PingFederateUnexpectedAuthUrl.yaml
Version	1.0.3
Arm template	9578ef7f-cbb4-4e9a-bd26-37c15c53b413.json

KQL

let known_domains = 
PingFederateEvent
| where TimeGenerated between (ago(14d) .. (1d))
| where isnotempty(DeviceCustomString1)
| extend url_parsed = parse_url(DeviceCustomString1)
| extend url_domain = extract(@'.*\.(.*\.[a-z]+)', 1, tostring(url_parsed.Host))
| summarize makeset(url_domain);
PingFederateEvent
| where isnotempty(DeviceCustomString1)
| extend url_parsed = parse_url(DeviceCustomString1)
| extend url_domain = extract(@'.*\.(.*\.[a-z]+)', 1, tostring(url_parsed.Host))
| where url_domain !in (known_domains)
| extend AccountCustomEntity = DstUserName
| extend IpCustomEntity = SrcIpAddr

YAML

queryPeriod: 14d
query: |
  let known_domains = 
  PingFederateEvent
  | where TimeGenerated between (ago(14d) .. (1d))
  | where isnotempty(DeviceCustomString1)
  | extend url_parsed = parse_url(DeviceCustomString1)
  | extend url_domain = extract(@'.*\.(.*\.[a-z]+)', 1, tostring(url_parsed.Host))
  | summarize makeset(url_domain);
  PingFederateEvent
  | where isnotempty(DeviceCustomString1)
  | extend url_parsed = parse_url(DeviceCustomString1)
  | extend url_domain = extract(@'.*\.(.*\.[a-z]+)', 1, tostring(url_parsed.Host))
  | where url_domain !in (known_domains)
  | extend AccountCustomEntity = DstUserName
  | extend IpCustomEntity = SrcIpAddr  
name: Ping Federate - Unexpected authentication URL.
entityMappings:
- fieldMappings:
  - columnName: AccountCustomEntity
    identifier: Name
  entityType: Account
- fieldMappings:
  - columnName: IpCustomEntity
    identifier: Address
  entityType: IP
queryFrequency: 1h
OriginalUri: https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/PingFederate/Analytic Rules/PingFederateUnexpectedAuthUrl.yaml
requiredDataConnectors:
- connectorId: CefAma
  dataTypes:
  - CommonSecurityLog
description: |
    'Detects unexpected authentication URL.'
kind: Scheduled
version: 1.0.3
status: Available
severity: Medium
relevantTechniques:
- T1078
triggerOperator: gt
triggerThreshold: 0
tactics:
- InitialAccess
id: 9578ef7f-cbb4-4e9a-bd26-37c15c53b413

ARM