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

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')  
relevantTechniques:
- T1566
severity: Low
tactics:
- InitialAccess
- Exfiltration
entityMappings:
- entityType: IP
  fieldMappings:
  - identifier: Address
    columnName: SourceIP
- entityType: URL
  fieldMappings:
  - identifier: Url
    columnName: RequestURL
- entityType: CloudApplication
  fieldMappings:
  - identifier: Name
    columnName: ApplicationProtocol
- entityType: Malware
  fieldMappings:
  - identifier: Name
    columnName: Activity
  - identifier: Category
    columnName: Rule
triggerThreshold: 0
OriginalUri: https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Contrast Protect/Analytic Rules/ContrastBlocks.yaml
id: 4396f8c3-d114-4154-9f4c-048ba522ed04
version: 1.0.2
description: |
    'Creates Incidents for Blocked events sourced from the Contrast Protect agent.'
customDetails:
  Application: ApplicationProtocol
  Agent: DeviceProduct
  Details: AdditionalExtensions
  Attack: Activity
  AgentVersion: DeviceVersion
queryPeriod: 5m
name: Contrast Blocks
requiredDataConnectors:
- connectorId: ContrastProtect
  dataTypes:
  - CommonSecurityLog
- connectorId: ContrastProtectAma
  dataTypes:
  - CommonSecurityLog
- connectorId: CefAma
  dataTypes:
  - CommonSecurityLog
status: Available
triggerOperator: gt
queryFrequency: 5m
kind: Scheduled

ARM