Google DNS - CVE-2020-1350 SIGRED exploitation pattern

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Id	1267d53d-f5fd-418b-b8da-34453a5994c2
Rulename	Google DNS - CVE-2020-1350 (SIGRED) exploitation pattern
Description	Detects exploitation pattern of CVE-2020-1350 (SIGRED) vulnerability.
Severity	High
Tactics	PrivilegeEscalation
Techniques	T1068
Required data connectors	GCPDNSDataConnector
Kind	Scheduled
Query frequency	15m
Query period	15m
Trigger threshold	0
Trigger operator	gt
Source Uri	https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/GoogleCloudPlatformDNS/Analytic Rules/GCPDNSSIGREDPattern.yaml
Version	1.0.0
Arm template	1267d53d-f5fd-418b-b8da-34453a5994c2.json

KQL

let threshold = 15;
GCPCloudDNS
| where QueryTypeName in~ ('SIG', 'RRSIG')
| where NetworkProtocol =~ 'TCP'
| summarize count() by SrcIpAddr, bin(TimeGenerated, 1m)
| where count_ < threshold
| extend IPCustomEntity = SrcIpAddr

YAML

kind: Scheduled
tactics:
- PrivilegeEscalation
triggerThreshold: 0
triggerOperator: gt
version: 1.0.0
name: Google DNS - CVE-2020-1350 (SIGRED) exploitation pattern
queryFrequency: 15m
id: 1267d53d-f5fd-418b-b8da-34453a5994c2
requiredDataConnectors:
- connectorId: GCPDNSDataConnector
  dataTypes:
  - GCPCloudDNS
relevantTechniques:
- T1068
description: |
    'Detects exploitation pattern of CVE-2020-1350 (SIGRED) vulnerability.'
entityMappings:
- entityType: IP
  fieldMappings:
  - columnName: IPCustomEntity
    identifier: Address
OriginalUri: https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/GoogleCloudPlatformDNS/Analytic Rules/GCPDNSSIGREDPattern.yaml
queryPeriod: 15m
severity: High
query: |
  let threshold = 15;
  GCPCloudDNS
  | where QueryTypeName in~ ('SIG', 'RRSIG')
  | where NetworkProtocol =~ 'TCP'
  | summarize count() by SrcIpAddr, bin(TimeGenerated, 1m)
  | where count_ < threshold
  | extend IPCustomEntity = SrcIpAddr

ARM