Contrast Blocks

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Id	4396f8c3-d114-4154-9f4c-048ba522ed04
Rulename	Contrast Blocks
Description	Creates Incidents for Blocked events sourced from the Contrast Protect agent.
Severity	Low
Tactics	InitialAccess Exfiltration
Techniques	T1566
Required data connectors	CefAma ContrastProtect ContrastProtectAma
Kind	Scheduled
Query frequency	5m
Query period	5m
Trigger threshold	0
Trigger operator	gt
Source Uri	https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Contrast Protect/Analytic Rules/ContrastBlocks.yaml
Version	1.0.2
Arm template	4396f8c3-d114-4154-9f4c-048ba522ed04.json

KQL

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

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

YAML

status: Available
queryFrequency: 5m
id: 4396f8c3-d114-4154-9f4c-048ba522ed04
tactics:
- InitialAccess
- Exfiltration
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
requiredDataConnectors:
- connectorId: ContrastProtect
  dataTypes:
  - CommonSecurityLog
- connectorId: ContrastProtectAma
  dataTypes:
  - CommonSecurityLog
- connectorId: CefAma
  dataTypes:
  - CommonSecurityLog
OriginalUri: https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Contrast Protect/Analytic Rules/ContrastBlocks.yaml
version: 1.0.2
query: |
  let extract_data=(a:string, k:string) {
    parse_urlquery(replace(@';', @'&', a))["Query Parameters"][k]
  };

  CommonSecurityLog 
  | where DeviceVendor == "Contrast Security"
  | where AdditionalExtensions contains "BLOCKED"
  | extend DeviceProduct
  | extend SourceIP
  | extend DeviceVersion
  | extend Activity
  | extend ApplicationProtocol
  | extend RequestURL
  | extend RequestMethod
  | extend Rule = extract_data(AdditionalExtensions, 'pri')  
description: |
    'Creates Incidents for Blocked events sourced from the Contrast Protect agent.'
relevantTechniques:
- T1566
customDetails:
  Details: AdditionalExtensions
  Application: ApplicationProtocol
  Agent: DeviceProduct
  Attack: Activity
  AgentVersion: DeviceVersion
triggerThreshold: 0
queryPeriod: 5m
triggerOperator: gt
name: Contrast Blocks
severity: Low
kind: Scheduled

ARM