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GCP-LogBased-Alerts.txt
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# Google Cloud Platform adversarial detection ruleset starter
#
# Author: Mike Gualtieri
# Gatsby, Inc.
#
# Provided as supplimental material for the talk:
# "Crafting Adversarial Detections at Scale in Google Cloud Platform"
# SANS Pen Test HackFest Summit - November 2022
#
# Configure these rules as GCP log-based alerts
# https://cloud.google.com/logging/docs/alerting/log-based-alerts
#
# To filter our known user or service account use append a filter
# like the following to the rule:
# -protoPayload.authenticationInfo.principalEmail="[email protected]"
#
# To filter out unauthenticated permission denied events append a filter
# like the following to the rule:
# -protoPayload.authenticationInfo.principalEmail=""
#
# Edit each rule to reflect your GCP project name (your-project-name)
#
- title: Compute Instance Detected Using the Default Compute Service Account
reason: Prevention
log_query:
resource.type="gce_instance"
protoPayload.request.serviceAccounts.email="<your_project_id>[email protected]"
- title: Owner/Editor/Viewer permission activity delta
reason: Prevention
gcp_log_type: activity
log_query:
logName="projects/your-project-name/logs/cloudaudit.googleapis.com%2Factivity"
resource.type="project"
resource.labels.project_id="your-project-name"
(protoPayload.serviceData.policyDelta.bindingDeltas.action="ADD"
OR protoPayload.serviceData.policyDelta.bindingDeltas.action="REMOVE")
(protoPayload.serviceData.policyDelta.bindingDeltas.role="roles/owner"
OR protoPayload.serviceData.policyDelta.bindingDeltas.role="roles/editor"
OR protoPayload.serviceData.policyDelta.bindingDeltas.role="roles/viewer")
- title: Data Access Log - Permission Denied
reason: Detect events following initial access
gcp_log_type: data_access
required_audit_log: Identity and Access Management (IAM) API
log_query:
logName="projects/your-project-name/logs/cloudaudit.googleapis.com%2Fdata_access"
(protoPayload.status.message="PERMISSION_DENIED" OR protoPayload.status.code="7")
- title: Permission denied impersonating service account
reason: Detect events following initial access
gcp_log_type: data_access
required_audit_log: Identity and Access Management (IAM) API
log_query:
logName="projects/your-project-name/logs/cloudaudit.googleapis.com%2Fdata_access"
resource.type="service_account"
protoPayload.methodName="GenerateAccessToken"
protoPayload.@type="type.googleapis.com/google.cloud.audit.AuditLog"
(protoPayload.status.message="PERMISSION_DENIED" OR protoPayload.status.code="7")
severity=ERROR
- title: Permission denied listing service accounts
reason: Detect events following initial access
gcp_log_type: data_access
required_audit_log: Identity and Access Management (IAM) API
log_query:
logName="projects/your-project-name/logs/cloudaudit.googleapis.com%2Fdata_access"
protoPayload.methodName="google.iam.admin.v1.ListServiceAccounts"
protoPayload.status.code="7"
- title: A firewall egress DENY event has been triggered
reason: Detect events following initial access
gcp_log_type: firewall
log_query:
logName:(projects/your-project-name/logs/compute.googleapis.com%2Ffirewall)
AND jsonPayload.rule_details.reference=~".*your_deny_rule_name.*"
- title: Account has listed Secret Manager Secrets
reason: Detect events to access sensitive data
gcp_log_type: data_access
required_audit_log: Secret Manager API
log_query:
logName="projects/your-project-name/logs/cloudaudit.googleapis.com%2Fdata_access"
resource.type="audited_resource"
protoPayload.methodName="google.cloud.secretmanager.v1.SecretManagerService.ListSecrets"
- title: Account has listed Service Accounts
reason: Detect events to access sensitive data
gcp_log_type: data_access
required_audit_log: Identity and Access Management (IAM) API
log_query:
logName="projects/your-project-name/logs/cloudaudit.googleapis.com%2Fdata_access"
protoPayload.methodName="google.iam.admin.v1.ListServiceAccounts"
- title: Account has retrieved IAM Role details
reason: Detect events to access sensitive data
gcp_log_type: data_access
required_audit_log: Identity and Access Management (IAM) API
log_query:
logName="projects/your-project-name/logs/cloudaudit.googleapis.com%2Fdata_access"
protoPayload.methodName="google.iam.admin.v1.GetRole"
- title: List Cloud Functions
reason: Detect events to access sensitive data
required_audit_log: Cloud Functions API
gcp_log_type: data_access
log_query:
logName="projects/your-project-name/logs/cloudaudit.googleapis.com%2Fdata_access"
protoPayload.serviceName="cloudfunctions.googleapis.com"
protoPayload.methodName="google.cloud.functions.v1.CloudFunctionsService.ListFunctions"
- title: Call to method CreateServiceAccount detected
reason: Detect lateral movement
gcp_log_type: activity
log_query:
logName="projects/your-project-name/logs/cloudaudit.googleapis.com%2Factivity"
resource.type="service_account"
resource.labels.project_id="your-project-name"
(protoPayload.methodName="google.iam.admin.v1.CreateServiceAccount")
- title: Call to method CreateServiceAccountKey detected
reason: Detect lateral movement
gcp_log_type: activity
log_query:
logName="projects/your-project-name/logs/cloudaudit.googleapis.com%2Factivity"
resource.type="service_account"
resource.labels.project_id="your-project-name"
(protoPayload.methodName="google.iam.admin.v1.CreateServiceAccountKey")
- title: SSH keys have been added to instance
reason: Detect lateral movement
gcp_log_type: activity
log_query:
logName="projects/your-project-name/logs/cloudaudit.googleapis.com%2Factivity"
resource.type="gce_instance"
protoPayload.metadata.instanceMetadataDelta.addedMetadataKeys="ssh-keys"
- title: SetIamPolicy role delta
reason: Detect lateral movement
gcp_log_type: activity
log_query:
logName="projects/your-project-name/logs/cloudaudit.googleapis.com%2Factivity"
resource.type="project"
resource.labels.project_id="your-project-name"
protoPayload.methodName="SetIamPolicy"
protoPayload.serviceData.policyDelta.bindingDeltas.role:*
- title: IAM Role delta
reason: Detect lateral movement
gcp_log_type: activity
log_query:
logName="projects/your-project-name/logs/cloudaudit.googleapis.com%2Factivity"
resource.type="iam_role"
resource.labels.project_id="your-project-name"
(protoPayload.methodName="google.iam.admin.v1.CreateRole"
OR protoPayload.methodName="google.iam.admin.v1.DeleteRole"
OR protoPayload.methodName="google.iam.admin.v1.UpdateRole")
- title: Firewall rule manually inserted with sourceRange of 0.0.0.0/0
reason: Detect events that maintain a foothold
gcp_log_type: activity
log_query:
logName="projects/your-project-name/logs/cloudaudit.googleapis.com%2Factivity"
resource.type="gce_firewall_rule"
resource.labels.project_id="your-project-name"
protoPayload.methodName="v1.compute.firewalls.insert"
protoPayload.request.sourceRanges="0.0.0.0/0"
- title: Firewall rules have been manually changed
reason: Detect events that maintain a foothold
gcp_log_type: activity
log_query:
logName="projects/your-project-name/logs/cloudaudit.googleapis.com%2Factivity"
resource.type="gce_firewall_rule"
resource.labels.project_id="your-project-name"
(protoPayload.methodName="v1.compute.firewalls.insert" OR protoPayload.methodName="v1.compute.firewalls.delete")
- title: GCS Bucket IAM permissions have been adjusted
reason: Detect events that maintain a foothold
gcp_log_type: activity
log_query:
logName="projects/your-project-name/logs/cloudaudit.googleapis.com%2Factivity"
resource.type=gcs_bucket
protoPayload.serviceName="storage.googleapis.com"
protoPayload.methodName="storage.setIamPermissions"
- title: Cloud Functions generated upload/download URLs
reason: Detect events that maintain a foothold
required_audit_log: Cloud Functions API
gcp_log_type: data_access
log_query:
logName="projects/your-project-name/logs/cloudaudit.googleapis.com%2Fdata_access"
protoPayload.serviceName="cloudfunctions.googleapis.com"
(protoPayload.methodName="google.cloud.functions.v1.CloudFunctionsService.GenerateDownloadUrl"
OR protoPayload.methodName="google.cloud.functions.v1.CloudFunctionsService.GenerateUploadUrl")