Cloud Storage GCP-storage.googleapis.com

10 operations, identified by methodName in the audit log.

methodName	Description
any	Catch-all entry for storage.googleapis.com. Source-only rules that attribute to the service without a specific method attribute here. Not a distinct audit log operation.
storage-buckets-delete	Permanently deletes an empty bucket.
storage-buckets-insert	Creates a new bucket. Google Cloud Storage uses a flat namespace, so you can't create a bucket with a name that is already in use.
storage-buckets-list	Retrieves a list of buckets for a given project, ordered in the list lexicographically by name.
storage-buckets-listChannels	Lists notification channels for the given bucket. Requires ADMIN_READ Data Access logging to be enabled.
storage-buckets-patch	Patches a bucket, changing only the metadata that is specified in the request.
storage-buckets-update	Updates a bucket. Changes to the bucket will be readable immediately after writing, but configuration changes may take time to propagate.
storage-hmacKeys-create	Creates a new HMAC key for the specified service account.
storage-hmacKeys-delete	Deletes an HMAC key. The HMAC key must be INACTIVE.
storage-setIamPermissions	Updates an IAM policy for the specified bucket. This method appears in Data Access audit logs as an ADMIN_READ entry when the caller reads IAM policies on bucket resources.

any: storage.googleapis.com (any method)

Service: GCP-storage.googleapis.com

Description

Catch-all entry for storage.googleapis.com. Source-only rules that attribute to the service without a specific method attribute here. Not a distinct audit log operation.

Fields #

Name	Description
`protoPayload.serviceName`	The GCP service endpoint that processed the request (e.g. compute.googleapis.com).
`protoPayload.methodName`	The specific API operation that was audited (versioned form, e.g. v1.compute.instances.insert).
`protoPayload.resourceName`	Scheme-less URI of the resource targeted by the operation.
`protoPayload.authenticationInfo.principalEmail`	Email address of the principal that performed the operation.
`protoPayload.requestMetadata.callerIp`	IP address of the caller.
`protoPayload.requestMetadata.callerSuppliedUserAgent`	User agent reported by the caller.
`protoPayload.authorizationInfo`	List of authorization checks performed (resource, permission, granted).
`protoPayload.request`	API request object (service-specific structure).
`protoPayload.response`	API response object (service-specific structure).
`logName`	Log stream identifier; suffix encodes the audit log type (activity, data_access, system_event, policy).

storage-buckets-delete: Delete bucket

Service: GCP-storage.googleapis.com

Description

Permanently deletes an empty bucket.

Fields #

Name	Description
`protoPayload.serviceName`	The GCP service endpoint that processed the request (e.g. compute.googleapis.com).
`protoPayload.methodName`	The specific API operation that was audited (versioned form, e.g. v1.compute.instances.insert).
`protoPayload.resourceName`	Scheme-less URI of the resource targeted by the operation.
`protoPayload.authenticationInfo.principalEmail`	Email address of the principal that performed the operation.
`protoPayload.requestMetadata.callerIp`	IP address of the caller.
`protoPayload.requestMetadata.callerSuppliedUserAgent`	User agent reported by the caller.
`protoPayload.authorizationInfo`	List of authorization checks performed (resource, permission, granted).
`protoPayload.request`	API request object (service-specific structure).
`protoPayload.response`	API response object (service-specific structure).
`logName`	Log stream identifier; suffix encodes the audit log type (activity, data_access, system_event, policy).

Detection Rules #

View all rules referencing this event →

Sigma #

Google Cloud Storage Buckets Modified or Deleted source medium: Detects when storage bucket is modified or deleted in Google Cloud.↳ also matches storage-buckets-insert: Insert bucket, storage-buckets-patch: Patch bucket, storage-buckets-update: Update bucket metadata

Elastic #

GCP Storage Bucket Deletion source medium: Identifies when a Google Cloud Platform (GCP) storage bucket is deleted. An adversary may delete a storage bucket in order to disrupt their target's business operations.

storage-buckets-insert: Insert bucket

Service: GCP-storage.googleapis.com

Description

Creates a new bucket. Google Cloud Storage uses a flat namespace, so you can't create a bucket with a name that is already in use.

Fields #

Name	Description
`protoPayload.serviceName`	The GCP service endpoint that processed the request (e.g. compute.googleapis.com).
`protoPayload.methodName`	The specific API operation that was audited (versioned form, e.g. v1.compute.instances.insert).
`protoPayload.resourceName`	Scheme-less URI of the resource targeted by the operation.
`protoPayload.authenticationInfo.principalEmail`	Email address of the principal that performed the operation.
`protoPayload.requestMetadata.callerIp`	IP address of the caller.
`protoPayload.requestMetadata.callerSuppliedUserAgent`	User agent reported by the caller.
`protoPayload.authorizationInfo`	List of authorization checks performed (resource, permission, granted).
`protoPayload.request`	API request object (service-specific structure).
`protoPayload.response`	API response object (service-specific structure).
`logName`	Log stream identifier; suffix encodes the audit log type (activity, data_access, system_event, policy).

Detection Rules #

View all rules referencing this event →

Sigma #

Google Cloud Storage Buckets Modified or Deleted source medium: Detects when storage bucket is modified or deleted in Google Cloud.↳ also matches storage-buckets-delete: Delete bucket, storage-buckets-patch: Patch bucket, storage-buckets-update: Update bucket metadata

storage-buckets-list: List buckets

Service: GCP-storage.googleapis.com

Description

Retrieves a list of buckets for a given project, ordered in the list lexicographically by name.

Fields #

Name	Description
`protoPayload.serviceName`	The GCP service endpoint that processed the request (e.g. compute.googleapis.com).
`protoPayload.methodName`	The specific API operation that was audited (versioned form, e.g. v1.compute.instances.insert).
`protoPayload.resourceName`	Scheme-less URI of the resource targeted by the operation.
`protoPayload.authenticationInfo.principalEmail`	Email address of the principal that performed the operation.
`protoPayload.requestMetadata.callerIp`	IP address of the caller.
`protoPayload.requestMetadata.callerSuppliedUserAgent`	User agent reported by the caller.
`protoPayload.authorizationInfo`	List of authorization checks performed (resource, permission, granted).
`protoPayload.request`	API request object (service-specific structure).
`protoPayload.response`	API response object (service-specific structure).
`logName`	Log stream identifier; suffix encodes the audit log type (activity, data_access, system_event, policy).

Detection Rules #

View all rules referencing this event →

Sigma #

Google Cloud Storage Buckets Enumeration source low: Detects when storage bucket is enumerated in Google Cloud.↳ also matches storage-buckets-listChannels: List bucket notification channels

storage-buckets-listChannels: List bucket notification channels

Service: GCP-storage.googleapis.com

Description

Lists notification channels for the given bucket. Requires ADMIN_READ Data Access logging to be enabled.

Fields #

Name	Description
`protoPayload.serviceName`	The GCP service endpoint that processed the request (e.g. compute.googleapis.com).
`protoPayload.methodName`	The specific API operation that was audited (versioned form, e.g. v1.compute.instances.insert).
`protoPayload.resourceName`	Scheme-less URI of the resource targeted by the operation.
`protoPayload.authenticationInfo.principalEmail`	Email address of the principal that performed the operation.
`protoPayload.requestMetadata.callerIp`	IP address of the caller.
`protoPayload.requestMetadata.callerSuppliedUserAgent`	User agent reported by the caller.
`protoPayload.authorizationInfo`	List of authorization checks performed (resource, permission, granted).
`protoPayload.request`	API request object (service-specific structure).
`protoPayload.response`	API response object (service-specific structure).
`logName`	Log stream identifier; suffix encodes the audit log type (activity, data_access, system_event, policy).

Detection Rules #

View all rules referencing this event →

Sigma #

Google Cloud Storage Buckets Enumeration source low: Detects when storage bucket is enumerated in Google Cloud.↳ also matches storage-buckets-list: List buckets

storage-buckets-patch: Patch bucket

Service: GCP-storage.googleapis.com

Description

Patches a bucket, changing only the metadata that is specified in the request.

Fields #

Name	Description
`protoPayload.serviceName`	The GCP service endpoint that processed the request (e.g. compute.googleapis.com).
`protoPayload.methodName`	The specific API operation that was audited (versioned form, e.g. v1.compute.instances.insert).
`protoPayload.resourceName`	Scheme-less URI of the resource targeted by the operation.
`protoPayload.authenticationInfo.principalEmail`	Email address of the principal that performed the operation.
`protoPayload.requestMetadata.callerIp`	IP address of the caller.
`protoPayload.requestMetadata.callerSuppliedUserAgent`	User agent reported by the caller.
`protoPayload.authorizationInfo`	List of authorization checks performed (resource, permission, granted).
`protoPayload.request`	API request object (service-specific structure).
`protoPayload.response`	API response object (service-specific structure).
`logName`	Log stream identifier; suffix encodes the audit log type (activity, data_access, system_event, policy).

Detection Rules #

View all rules referencing this event →

Sigma #

Google Cloud Storage Buckets Modified or Deleted source medium: Detects when storage bucket is modified or deleted in Google Cloud.↳ also matches storage-buckets-delete: Delete bucket, storage-buckets-insert: Insert bucket, storage-buckets-update: Update bucket metadata

storage-buckets-update: Update bucket metadata

Service: GCP-storage.googleapis.com

Description

Updates a bucket. Changes to the bucket will be readable immediately after writing, but configuration changes may take time to propagate.

Fields #

Name	Description
`protoPayload.serviceName`	The GCP service endpoint that processed the request (e.g. compute.googleapis.com).
`protoPayload.methodName`	The specific API operation that was audited (versioned form, e.g. v1.compute.instances.insert).
`protoPayload.resourceName`	Scheme-less URI of the resource targeted by the operation.
`protoPayload.authenticationInfo.principalEmail`	Email address of the principal that performed the operation.
`protoPayload.requestMetadata.callerIp`	IP address of the caller.
`protoPayload.requestMetadata.callerSuppliedUserAgent`	User agent reported by the caller.
`protoPayload.authorizationInfo`	List of authorization checks performed (resource, permission, granted).
`protoPayload.request`	API request object (service-specific structure).
`protoPayload.response`	API response object (service-specific structure).
`logName`	Log stream identifier; suffix encodes the audit log type (activity, data_access, system_event, policy).

Detection Rules #

View all rules referencing this event →

Sigma #

Google Cloud Storage Buckets Modified or Deleted source medium: Detects when storage bucket is modified or deleted in Google Cloud.↳ also matches storage-buckets-delete: Delete bucket, storage-buckets-insert: Insert bucket, storage-buckets-patch: Patch bucket

Elastic #

GCP Storage Bucket Configuration Modification source medium: Identifies when the configuration is modified for a storage bucket in Google Cloud Platform (GCP). An adversary may modify the configuration of a storage bucket in order to weaken the security controls of their target's environment.

storage-hmacKeys-create: Create HMAC key

Service: GCP-storage.googleapis.com

Description

Creates a new HMAC key for the specified service account.

Fields #

Name	Description
`protoPayload.serviceName`	The GCP service endpoint that processed the request (e.g. compute.googleapis.com).
`protoPayload.methodName`	The specific API operation that was audited (versioned form, e.g. v1.compute.instances.insert).
`protoPayload.resourceName`	Scheme-less URI of the resource targeted by the operation.
`protoPayload.authenticationInfo.principalEmail`	Email address of the principal that performed the operation.
`protoPayload.requestMetadata.callerIp`	IP address of the caller.
`protoPayload.requestMetadata.callerSuppliedUserAgent`	User agent reported by the caller.
`protoPayload.authorizationInfo`	List of authorization checks performed (resource, permission, granted).
`protoPayload.request`	API request object (service-specific structure).
`protoPayload.response`	API response object (service-specific structure).
`logName`	Log stream identifier; suffix encodes the audit log type (activity, data_access, system_event, policy).

storage-hmacKeys-delete: Delete HMAC key

Service: GCP-storage.googleapis.com

Description

Deletes an HMAC key. The HMAC key must be INACTIVE.

Fields #

Name	Description
`protoPayload.serviceName`	The GCP service endpoint that processed the request (e.g. compute.googleapis.com).
`protoPayload.methodName`	The specific API operation that was audited (versioned form, e.g. v1.compute.instances.insert).
`protoPayload.resourceName`	Scheme-less URI of the resource targeted by the operation.
`protoPayload.authenticationInfo.principalEmail`	Email address of the principal that performed the operation.
`protoPayload.requestMetadata.callerIp`	IP address of the caller.
`protoPayload.requestMetadata.callerSuppliedUserAgent`	User agent reported by the caller.
`protoPayload.authorizationInfo`	List of authorization checks performed (resource, permission, granted).
`protoPayload.request`	API request object (service-specific structure).
`protoPayload.response`	API response object (service-specific structure).
`logName`	Log stream identifier; suffix encodes the audit log type (activity, data_access, system_event, policy).

Common Indicators #

Field/value combinations most frequently checked by detection rules targeting this event, derived from cross-vendor predicate analysis.

Field	Kind	Value	Rules	Vendors
`target.application`	eq	`storage.googleapis.com`	1 rule	chronicle

Detection Rules #

View all rules referencing this event →

YARA-L #

GCP Multiple HMAC Keys Deleted source: Detect when multiple HMAC authentication keys are deleted from GCP Storage settings.

storage-setIamPermissions: Set IAM permissions on bucket

Service: GCP-storage.googleapis.com

Description

Updates an IAM policy for the specified bucket. This method appears in Data Access audit logs as an ADMIN_READ entry when the caller reads IAM policies on bucket resources.

Fields #

Name	Description
`protoPayload.serviceName`	The GCP service endpoint that processed the request (e.g. compute.googleapis.com).
`protoPayload.methodName`	The specific API operation that was audited (versioned form, e.g. v1.compute.instances.insert).
`protoPayload.resourceName`	Scheme-less URI of the resource targeted by the operation.
`protoPayload.authenticationInfo.principalEmail`	Email address of the principal that performed the operation.
`protoPayload.requestMetadata.callerIp`	IP address of the caller.
`protoPayload.requestMetadata.callerSuppliedUserAgent`	User agent reported by the caller.
`protoPayload.authorizationInfo`	List of authorization checks performed (resource, permission, granted).
`protoPayload.request`	API request object (service-specific structure).
`protoPayload.response`	API response object (service-specific structure).
`logName`	Log stream identifier; suffix encodes the audit log type (activity, data_access, system_event, policy).

Common Indicators #

Field/value combinations most frequently checked by detection rules targeting this event, derived from cross-vendor predicate analysis.

Field	Kind	Value	Rules	Vendors
`target.application`	eq	`storage.googleapis.com`	1 rule	chronicle
`target.resource.attribute.labels["ser_binding_deltas_action"]`	eq	`ADD`	1 rule	chronicle

Detection Rules #

View all rules referencing this event →

Elastic #

GCP Storage Bucket Permissions Modification source medium: Identifies when the Identity and Access Management (IAM) permissions are modified for a Google Cloud Platform (GCP) storage bucket. An adversary may modify the permissions on a storage bucket to weaken their target's security controls or an administrator may inadvertently modify the permissions, which could lead to data exposure or loss.

Kusto #

GCP Audit Logs - Storage Bucket Made Public source high: Detects when a Google Cloud Storage bucket is made publicly accessible by granting permissions to allUsers or allAuthenticatedUsers. Making buckets public can expose sensitive data to unauthorized access and may indicate a misconfiguration or malicious activity. Adversaries may make buckets public to exfiltrate data or as part of a data exposure attack. This rule monitors setIamPermissions operations that add public access roles to storage buckets.

YARA-L #

GCP Storage Bucket Opened To Public source: Detect when Google Cloud Storage buckets are opened to public by adding allUsers or allAuthenticatedUsers to the access policy.

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`type:`	`events` / `rules` / `providers`
`vendor:`	`sigma` / `elastic` / `splunk` / `kusto` / `chronicle` (vendor name alone also works: `sigma:`, `kql:`, `secops:`…)
`tactic:`	TA-id, slug, or name: `credential_access`, `TA0006`
`technique:`	technique or sub-technique ID: `T1003`, `T1003.001` (alias `tech:`)
`severity:`	`critical` / `high` / `medium` / `low` / `informational` (alias `sev:`)
`risk_score`	Numeric comparison on the Elastic risk score (0 to 100): `risk_score>50`, `risk_score<=20`, `risk_score=99` (alias `risk`; Elastic rules only)
`stages:`	Rules with exactly N pipeline stages
`correlation:`	`single_event` / `sequence` / `alternatives` / `alternatives_cross_log` / `all_required` / `correlated`
`with:`	Co-occurrence event-id; stacks (`with:4624 with:4769`) to require all, while a comma list in one occurrence (`with:4624,4769`) is an either-or group. Implies multi-event
`like:`	Structural neighbors of a rule slug (equivalents + subsumption stricter / broader): `like:comsvcs_lsass_memory_dump-splunk-sysmon`
`groupby:`	Entity-grouping substring match against `group_by_keys`: `groupby:user`, `groupby:host`
`uses:`	Rules whose predicate tree touches the field (any kind, any value): `uses:CommandLine`
`excludes:`	Rules with top-level `not()` clauses on the field (FP whitelists): `excludes:ParentImage`
`field:` / `value:`	Predicate search; narrows rule cards to those with a matching leaf and drives the indicator tier. Unquoted = substring, wildcards allowed (`value:mimikatz`)
`indicator:`	Shorthand for `field:F value:V`: `indicator:Image=*\powershell.exe`
`kind:`	Filter by predicate kind. Narrows rule cards to those carrying a matching predicate leaf (`vendor:elastic kind:cidr_match`) and drives the indicator tier: `contains` / `starts_with` / `ends_with` / `regex` / `cidr` / `eq` / `in` … (operator aliases `op:`/`match:`)
`has:` / `no:`	`sample`, `field`, `notes`, `refs`, `trace`, `thirdparty`, `rule`, `pattern`, `timewindow`, `threshold`, `newterms`, `sigma`/`elastic`/`splunk`/`kusto`/`chronicle`
`-op:val`	Exclude matches; works on most operators but not `type:`/`like:`/`has:`/`no:` (use `no:<flag>` to exclude a rule flag): `tactic:execution -vendor:splunk`. Standalone `-kind:`/`-field:`/`-value:` drop every rule carrying a matching predicate leaf (`type:rules -kind:is_null`)
`field:"…"` / `value:"…"`	Quoted value = anchored exact match (also allows spaces): `value:"net user"`
`a,b`	Comma = OR inside one operator (`vendor:sigma,elastic`, `severity:high,critical`); repeating a facet merges the same way. `field:`/`value:` never split (literal commas)
`vendors:` / `stage:`	Singular and plural spellings fold to the canonical operator and value: `tactics:` = `tactic:`, `type:event` = `type:events`, `correlation:sequences` = `correlation:sequence`, `has:thresholds` = `has:threshold`
`"quoted phrase"`	Exact-match a multi-word phrase (free text)