GCP Cloud Run Service Created

Severity: low
Log types: GCP.AuditLog
Reference: https://cloud.google.com/run/docs/quickstarts/deploy-container
Source: github.com/panther-labs/panther-analysis

Detects creation of new Cloud Run Service, which, if configured maliciously, may be part of the attack aimed to invoke the service and retrieve the access token.

Rule body yaml

AnalysisType: rule
LogTypes:
  - GCP.AuditLog
Description:
  Detects creation of new Cloud Run Service, which, if configured maliciously, may be part of the attack
  aimed to invoke the service and retrieve the access token.
DisplayName: "GCP Cloud Run Service Created"
RuleID: "GCP.Cloud.Run.Service.Created"
Filename: gcp_cloud_run_service_created.py
Enabled: true
CreateAlert: false
Reference: https://cloud.google.com/run/docs/quickstarts/deploy-container
Runbook: Confirm this was authorized and necessary behavior
Severity: Low
DedupPeriodMinutes: 60
Threshold: 1
Tests:
  - Name: GCP No methodName found
    ExpectedResult: false
    Log:
      {
        "p_event_time": "2024-07-22 14:20:56.237323088",
        "p_log_type": "GCP.AuditLog",
        "insertId": "123456789xyz",
        "logName": "projects/internal-sentry/logs/cloudaudit.googleapis.com%2Factivity",
        "protoPayload":
          {
            "at_sign_type": "type.googleapis.com/google.cloud.audit.AuditLog",
            "authenticationInfo":
              {
                "principalEmail": "0000000000000@cloudbuild.gserviceaccount.com",
              },
            "authorizationInfo":
              [
                {
                  "granted": true,
                  "permission": "cloudbuild.builds.create",
                  "resource": "projects/00000000aaaaaaaa",
                  "resourceAttributes": {},
                },
              ],
            "requestMetadata":
              {
                "destinationAttributes": {},
                "requestAttributes":
                  { "auth": {}, "time": "2024-07-22T14:20:55.898367039Z" },
              },
          },
        "receiveTimestamp": "2024-07-22 14:20:56.428021476",
        "resource":
          {
            "labels":
              { "method": "", "project_id": "some-project", "service": "" },
            "type": "audited_resource",
          },
        "severity": "NOTICE",
        "timestamp": "2024-07-22 14:20:56.237323088",
      }
  - Name: GCP Run Service Created
    ExpectedResult: true
    Log:
      {
        "insertId": "jzm5rucrn2",
        "logName": "projects/some-project/logs/cloudaudit.googleapis.com%2Factivity",
        "protoPayload":
          {
            "at_sign_type": "type.googleapis.com/google.cloud.audit.AuditLog",
            "authenticationInfo":
              {
                "principalEmail": "some.user@company.com",
                "principalSubject": "user:some.user@company.com",
              },
            "authorizationInfo":
              [
                {
                  "granted": true,
                  "permission": "run.services.create",
                  "resource": "namespaces/some-project/services/cloudrun-exfil",
                  "resourceAttributes": {},
                },
              ],
            "methodName": "google.cloud.run.v1.Services.CreateService",
            "request":
              {
                "@type": "type.googleapis.com/google.cloud.run.v1.CreateServiceRequest",
                "parent": "namespaces/some-project",
                "service":
                  {
                    "apiVersion": "serving.knative.dev/v1",
                    "kind": "Service",
                    "metadata":
                      {
                        "annotations":
                          {
                            "client.knative.dev/user-image": "us-west1-docker.pkg.dev/some-project/abc-test/run_services_create_test",
                          },
                        "name": "cloudrun-exfil",
                        "namespace": "some-project",
                      },
                    "spec":
                      {
                        "template":
                          {
                            "metadata":
                              {
                                "annotations":
                                  {
                                    "client.knative.dev/user-image": "us-west1-docker.pkg.dev/some-project/abc-test/run_services_create_test",
                                  },
                                "labels":
                                  {
                                    "cloud.googleapis.com/location": "us-west1",
                                  },
                                "name": "cloudrun-exfil-00001-zif",
                              },
                            "spec":
                              {
                                "serviceAccountName": "abc-test@some-project.iam.gserviceaccount.com",
                              },
                          },
                      },
                  },
              },
            "requestMetadata":
              {
                "callerIP": "1.2.3.4",
                "callerSuppliedUserAgent": "(gzip),gzip(gfe)",
                "destinationAttributes": {},
                "requestAttributes":
                  { "auth": {}, "time": "2024-02-02T09:43:54.690161Z" },
              },
            "resourceLocation": { "currentLocations": ["us-west1"] },
            "resourceName": "namespaces/some-project/services/cloudrun-exfil",
            "response":
              {
                "@type": "type.googleapis.com/google.cloud.run.v1.Service",
                "apiVersion": "serving.knative.dev/v1",
                "kind": "Service",
                "metadata":
                  {
                    "annotations":
                      {
                        "client.knative.dev/user-image": "us-west1-docker.pkg.dev/some-project/abc-test/run_services_create_test",
                        "run.googleapis.com/ingress": "all",
                        "run.googleapis.com/operation-id": "6fdf115a-1bdd-4836-b0ca-ae71f8ba6718",
                        "serving.knative.dev/creator": "some.user@company.com",
                        "serving.knative.dev/lastModifier": "some.user@company.com",
                      },
                    "creationTimestamp": "2024-02-02T09:43:54.640837Z",
                    "generation": 1,
                    "labels": { "cloud.googleapis.com/location": "us-west1" },
                    "name": "cloudrun-exfil",
                    "namespace": "1028347275902",
                    "resourceVersion": "AAYQYvNHUcU",
                    "selfLink": "/apis/serving.knative.dev/v1/namespaces/1028347275902/services/cloudrun-exfil",
                    "uid": "45101e8e-7b91-4c41-81a1-969e876923f4",
                  },
                "spec":
                  {
                    "template":
                      {
                        "metadata":
                          {
                            "annotations":
                              {
                                "autoscaling.knative.dev/maxScale": "100",
                                "client.knative.dev/user-image": "us-west1-docker.pkg.dev/some-project/abc-test/run_services_create_test",
                              },
                            "labels":
                              {
                                "run.googleapis.com/startupProbeType": "Default",
                              },
                            "name": "cloudrun-exfil-00001-zif",
                          },
                        "spec":
                          {
                            "containerConcurrency": 80,
                            "serviceAccountName": "abc-test@some-project.iam.gserviceaccount.com",
                            "timeoutSeconds": 300,
                          },
                      },
                    "traffic": [{ "latestRevision": true, "percent": 100 }],
                  },
                "status": {},
              },
            "serviceName": "run.googleapis.com",
          },
        "receiveTimestamp": "2024-02-02 09:43:54.723840817",
        "resource":
          {
            "labels":
              {
                "configuration_name": "",
                "location": "us-west1",
                "project_id": "some-project",
                "revision_name": "",
                "service_name": "cloudrun-exfil",
              },
            "type": "cloud_run_revision",
          },
        "severity": "NOTICE",
        "timestamp": "2024-02-02 09:43:54.497796000",
      }
  - Name: GCP Run Service Not Created
    ExpectedResult: false
    Log:
      {
        "insertId": "jfca5rd3wqn",
        "logName": "projects/some-project/logs/cloudaudit.googleapis.com%2Factivity",
        "protoPayload":
          {
            "at_sign_type": "type.googleapis.com/google.cloud.audit.AuditLog",
            "authenticationInfo":
              {
                "principalEmail": "some.user@company.com",
                "principalSubject": "user:some.user@company.com",
              },
            "authorizationInfo":
              [
                {
                  "granted": true,
                  "permission": "run.services.create",
                  "resource": "namespaces/some-project/services/cloudrun-exfil",
                  "resourceAttributes": {},
                },
              ],
            "methodName": "google.cloud.run.v1.Services.CreateService",
            "request": ...,
            "requestMetadata": ...,
            "resourceLocation": ...,
            "resourceName": ...,
            "serviceName": "run.googleapis.com",
            "status":
              {
                "code": 6,
                "message": "Resource 'cloudrun-exfil' already exists.",
              },
          },
        "receiveTimestamp": "2024-02-02 09:36:22.250430490",
        "resource": ...,
        "severity": "ERROR",
        "timestamp": "2024-02-02 09:36:21.212182000",
      }

Detection logic

Condition

severity ne "ERROR"
protoPayload.methodName ends_with "Services.CreateService"
protoPayload.authorizationInfo is_not_null
protoPayload.authorizationInfo array_any

Indicators

Each row is a field, operator, and value that the rule matches. The corpus column counts how many other rules in the catalog look for the same combination: high numbers point to widely-used, community-vetted indicators. Blank or 1 shows that the indicator is specific to this rule.

Field	Kind	Values
`protoPayload.authorizationInfo`	is_not_null	(no value, null check)
`protoPayload.methodName`	ends_with	`Services.CreateService`
`severity`	ne	`ERROR`

Output fields

Fields the rule emits when it matches. Chronicle authors list these in the outcome block; they appear on the detection and $risk_score drives alerting. Sentinel / Defender XDR rules build them up through project / summarize / extend stages. Sentinel maps these into alert fields via entityMappings and customDetails; Defender XDR custom detections surface them as alert fields directly.

Field	Source
`project`	`resource.labels.project_id`
`principal`	`protoPayload.authenticationInfo.principalEmail`
`caller_ip`	`protoPayload.requestMetadata.callerIP`
`methodName`	`protoPayload.methodName`
`resourceName`	`protoPayload.resourceName`
`serviceName`	`protoPayload.serviceName`

`j` / `k`	Scroll down / up
`d` / `u`	Half-page down / up
`gg` / `G`	Top / bottom
`h` / `l`	History back / forward
`f`	Follow link (`Shift` = new tab)
`/`	Focus search
`?`	Toggle this help
`↑` / `↓`	Navigate search results
`Enter`	Open highlighted result
`Esc`	Close results / dialog

`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)