Contrast Probes

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Id	297596de-d9ae-4fb8-b6ff-00fc01c9462d
Rulename	Contrast Probes
Description	Creates Incidents for Probed events sourced from the Contrast Protect agent.
Severity	Informational
Tactics	InitialAccess Exfiltration
Techniques	T1566
Required data connectors	CefAma ContrastProtect ContrastProtectAma
Kind	Scheduled
Query frequency	5m
Query period	5m
Trigger threshold	10
Trigger operator	gt
Source Uri	https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Contrast Protect/Analytic Rules/ContrastProbes.yaml
Version	1.0.2
Arm template	297596de-d9ae-4fb8-b6ff-00fc01c9462d.json

KQL

let extract_data=(a:string, k:string) {
  parse_urlquery(replace(@';', @'&', a))["Query Parameters"][k]
};

CommonSecurityLog 
| where DeviceVendor == "Contrast Security"
| where AdditionalExtensions contains "PROBED" or AdditionalExtensions contains "INEFFECTIVE"
| extend DeviceProduct
| extend SourceIP
| extend DeviceVersion
| extend Activity
| extend ApplicationProtocol
| extend RequestURL
| extend RequestMethod
| extend Rule = extract_data(AdditionalExtensions, 'pri')

YAML

version: 1.0.2
triggerOperator: gt
OriginalUri: https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Contrast Protect/Analytic Rules/ContrastProbes.yaml
status: Available
description: |
    'Creates Incidents for Probed events sourced from the Contrast Protect agent.'
customDetails:
  Attack: Activity
  Details: AdditionalExtensions
  Application: ApplicationProtocol
  Agent: DeviceProduct
  AgentVersion: DeviceVersion
queryFrequency: 5m
name: Contrast Probes
tactics:
- InitialAccess
- Exfiltration
triggerThreshold: 10
id: 297596de-d9ae-4fb8-b6ff-00fc01c9462d
query: |
  let extract_data=(a:string, k:string) {
    parse_urlquery(replace(@';', @'&', a))["Query Parameters"][k]
  };

  CommonSecurityLog 
  | where DeviceVendor == "Contrast Security"
  | where AdditionalExtensions contains "PROBED" or AdditionalExtensions contains "INEFFECTIVE"
  | extend DeviceProduct
  | extend SourceIP
  | extend DeviceVersion
  | extend Activity
  | extend ApplicationProtocol
  | extend RequestURL
  | extend RequestMethod
  | extend Rule = extract_data(AdditionalExtensions, 'pri')  
severity: Informational
queryPeriod: 5m
entityMappings:
- fieldMappings:
  - columnName: SourceIP
    identifier: Address
  entityType: IP
- fieldMappings:
  - columnName: RequestURL
    identifier: Url
  entityType: URL
- fieldMappings:
  - columnName: ApplicationProtocol
    identifier: Name
  entityType: CloudApplication
- fieldMappings:
  - columnName: Activity
    identifier: Name
  - columnName: Rule
    identifier: Category
  entityType: Malware
relevantTechniques:
- T1566
kind: Scheduled
requiredDataConnectors:
- connectorId: ContrastProtect
  dataTypes:
  - CommonSecurityLog
- connectorId: ContrastProtectAma
  dataTypes:
  - CommonSecurityLog
- connectorId: CefAma
  dataTypes:
  - CommonSecurityLog

ARM