Ping Federate - OAuth old version

Status: available
Severity: medium
Time window: 1d
Source: github.com/Azure/Azure-Sentinel

'Detects requests using not the latest version of OAuth protocol.'

MITRE ATT&CK coverage

Tactic	Techniques
Initial Access	`T1190` Exploit Public-Facing Application

Rule body

id: 85f70197-4865-4635-a4b2-a9c57e8fea1b
name: Ping Federate - OAuth old version
description: |
  'Detects requests using not the latest version of OAuth protocol.'
severity: Medium
status: Available
requiredDataConnectors:
  - connectorId: CefAma
    dataTypes:
      - CommonSecurityLog
queryFrequency: 1d
queryPeriod: 1d
triggerOperator: gt
triggerThreshold: 0
tactics:
  - InitialAccess
relevantTechniques:
  - T1190
query: |
  PingFederateEvent
  | where isnotempty(DeviceCustomString3)
  | extend proto = extract(@'(OAuth)', 1, DeviceCustomString3)
  | extend ver = extract(@'(\d+)', 1, DeviceCustomString3)
  | where proto =~ 'OAuth'
  | where ver !~ '20'
  | extend AccountCustomEntity = DstUserName
  | extend IpCustomEntity = SrcIpAddr
entityMappings:
  - entityType: Account
    fieldMappings:
      - identifier: Name
        columnName: AccountCustomEntity
  - entityType: IP
    fieldMappings:
      - identifier: Address
        columnName: IpCustomEntity
version: 1.0.3
kind: Scheduled

Stages and Predicates

Stage 1: `source`

PingFederateEvent

Stage 2: `where`

| where isnotempty(DeviceCustomString3)

Stage 3: `extend`

| extend proto = extract(@'(OAuth)', 1, DeviceCustomString3)

Stage 4: `extend`

| extend ver = extract(@'(\d+)', 1, DeviceCustomString3)

Stage 5: `where`

| where proto =~ 'OAuth'

Stage 6: `where`

| where ver !~ '20'

Stage 7: `extend`

| extend AccountCustomEntity = DstUserName

Stage 8: `extend`

| extend IpCustomEntity = SrcIpAddr

Indicators

These rows show field, operator, and value matches.

Field	Kind	Values	Search
`DeviceCustomString3`	is_not_null	(no value, null check)	`field:"DeviceCustomString3" kind:is_not_null`
`proto`	eq	`OAuth`	`field:"proto" kind:eq value:"OAuth"`
`ver`	ne	`20`	`field:"ver" kind:ne value:"20"`

Output fields

These fields are emitted when the rule matches.

Field	Source
`proto`	`extend`
`ver`	`extend`
`AccountCustomEntity`	`extend`
`IpCustomEntity`	`extend`

Ping Federate - OAuth old version

MITRE ATT&CK coverage

Rule body

Stages and Predicates

Stage 1: source

Stage 2: where

Stage 3: extend

Stage 4: extend

Stage 5: where

Stage 6: where

Stage 7: extend

Stage 8: extend

Indicators

Output fields

Stage 1: `source`

Stage 2: `where`

Stage 3: `extend`

Stage 4: `extend`

Stage 5: `where`

Stage 6: `where`

Stage 7: `extend`

Stage 8: `extend`