GCP IAM - Empty user agent

Back


Id	9e0d8632-d33d-4075-979e-c972674f77b3
Rulename	GCP IAM - Empty user agent
Description	Detects requests where user agent is empty.
Severity	Medium
Tactics	DefenseEvasion
Techniques	T1550
Required data connectors	GCPIAMDataConnector
Kind	Scheduled
Query frequency	1h
Query period	1h
Trigger threshold	0
Trigger operator	gt
Source Uri	https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/GoogleCloudPlatformIAM/Analytic Rules/GCPIAMEmptyUA.yaml
Version	1.0.1
Arm template	9e0d8632-d33d-4075-979e-c972674f77b3.json

KQL

GCP_IAM
| where isempty(HttpUserAgentOriginal)
| extend AccountName = tostring(split(PayloadAuthenticationinfoPrincipalemail, "@")[0]), AccountUPNSuffix = tostring(split(PayloadAuthenticationinfoPrincipalemail, "@")[1])

YAML

id: 9e0d8632-d33d-4075-979e-c972674f77b3
triggerOperator: gt
OriginalUri: https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/GoogleCloudPlatformIAM/Analytic Rules/GCPIAMEmptyUA.yaml
entityMappings:
- fieldMappings:
  - identifier: FullName
    columnName: PayloadAuthenticationinfoPrincipalemail
  - identifier: Name
    columnName: AccountName
  - identifier: UPNSuffix
    columnName: AccountUPNSuffix
  entityType: Account
- fieldMappings:
  - identifier: Address
    columnName: SrcIpAddr
  entityType: IP
requiredDataConnectors:
- dataTypes:
  - GCP_IAM
  connectorId: GCPIAMDataConnector
queryFrequency: 1h
queryPeriod: 1h
status: Available
query: |
  GCP_IAM
  | where isempty(HttpUserAgentOriginal)
  | extend AccountName = tostring(split(PayloadAuthenticationinfoPrincipalemail, "@")[0]), AccountUPNSuffix = tostring(split(PayloadAuthenticationinfoPrincipalemail, "@")[1])  
name: GCP IAM - Empty user agent
kind: Scheduled
tactics:
- DefenseEvasion
severity: Medium
relevantTechniques:
- T1550
triggerThreshold: 0
version: 1.0.1
description: |
    'Detects requests where user agent is empty.'

ARM