Google DNS - CVE-2021-34527 (PrintNightmare) external exploit

Severity: high
Time window: 15m
Source: github.com/Azure/Azure-Sentinel

'Detects CVE-2021-34527 (PrintNightmare) external exploit'

MITRE ATT&CK coverage

Tactic	Techniques
Privilege Escalation	`T1068` Exploitation for Privilege Escalation

Rule body

id: e632e73a-06c4-47f6-8bed-b2498aa6e30f
name: Google DNS - CVE-2021-34527 (PrintNightmare) external exploit
description: |
  'Detects CVE-2021-34527 (PrintNightmare) external exploit'
severity: High
requiredDataConnectors:
  - connectorId: GCPDNSDataConnector
    dataTypes:
      - GCPCloudDNS
queryFrequency: 15m
queryPeriod: 15m
triggerOperator: gt
triggerThreshold: 0
tactics:
  - PrivilegeEscalation
relevantTechniques:
  - T1068
query: |
  GCPCloudDNS
  | where Query has 'gentilkiwi'
  | extend DNSCustomEntity = Query, IPCustomEntity = SrcIpAddr
entityMappings:
  - entityType: DNS
    fieldMappings:
      - identifier: DomainName
        columnName: DNSCustomEntity
  - entityType: IP
    fieldMappings:
      - identifier: Address
        columnName: IPCustomEntity
version: 1.0.0
kind: Scheduled

Stages and Predicates

Stage 1: `source`

GCPCloudDNS

Stage 2: `where`

| where Query has 'gentilkiwi'

Stage 3: `extend`

| extend DNSCustomEntity = Query, IPCustomEntity = SrcIpAddr

Indicators

These rows show field, operator, and value matches.

Field	Kind	Values	Search
`Query`	match	`gentilkiwi` transforms: `term`	`field:"Query" kind:match value:"gentilkiwi"`

Output fields

These fields are emitted when the rule matches.

Field	Source
`DNSCustomEntity`	`extend`
`IPCustomEntity`	`extend`

Google DNS - CVE-2021-34527 (PrintNightmare) external exploit

MITRE ATT&CK coverage

Rule body

Stages and Predicates

Stage 1: source

Stage 2: where

Stage 3: extend

Indicators

Output fields

Stage 1: `source`

Stage 2: `where`

Stage 3: `extend`