GSuite External Drive Document

Severity: low
Group by: actor.email
Log types: GSuite.ActivityEvent
Tags: GSuite, Collection:Data from Information Repositories, Configuration Required
Reference: https://support.google.com/a/users/answer/12380484?hl=en&sjid=864417124752637253-EU
Source: github.com/panther-labs/panther-analysis

A Google drive resource became externally accessible.

MITRE ATT&CK coverage

Tactic	Techniques
Collection	`T1213` Data from Information Repositories

Rule body yaml

AnalysisType: rule
Filename: gsuite_drive_visibility_change.py
RuleID: "GSuite.DriveVisibilityChanged"
DisplayName: "GSuite External Drive Document"
Enabled: false
LogTypes:
  - GSuite.ActivityEvent
Tags:
  - GSuite
  - Collection:Data from Information Repositories
  - Configuration Required
Reports:
  MITRE ATT&CK:
    - TA0009:T1213
Severity: Low
Description: >
  A Google drive resource became externally accessible.
Reference: https://support.google.com/a/users/answer/12380484?hl=en&sjid=864417124752637253-EU
Runbook: >
  Investigate whether the drive document is appropriate to be publicly accessible.
SummaryAttributes:
  - actor:email
DedupPeriodMinutes: 360 # 6 hours
Tests:
  - Name: Access Event
    ExpectedResult: false
    Log:
      {
            "p_log_type": "GSuite.ActivityEvent",
            "p_row_id": "111222",
            "actor": {
                  "email": "bobert@example.com"
            },
            "id": {
                  "applicationName": "drive"
            },
            "type": "access",
            "name": "upload"
      }
  - Name: ACL Change without Visibility Change
    ExpectedResult: false
    Log:
      {
            "p_log_type": "GSuite.ActivityEvent",
            "p_row_id": "111222",
            "actor": {
                  "email": "bobert@example.com"
            },
            "id": {
                  "applicationName": "drive"
            },
            "type": "acl_change",
            "name": "shared_drive_settings_change"
      }
  - Name: Doc Became Public - Link (Unrestricted)
    ExpectedResult: true
    Log:
      {
            "p_log_type": "GSuite.ActivityEvent",
            "p_row_id": "111222",
            "actor": {
                  "email": "bobert@gmail.com"
            },
            "id": {
                  "applicationName": "drive"
            },
            "type": "acl_change",
            "name": "change_document_visibility",
            "parameters": {
                  "visibility_change": "external",
                  "doc_title": "my shared document",
                  "target_domain": "all",
                  "visibility": "people_with_link",
                  "new_value": [
                        "people_with_link"
                  ]
            }
      }
  - Name: Doc Became Public - Link (Allowlisted Domain Not Configured)
    ExpectedResult: true
    Log:
      {
            "p_log_type": "GSuite.ActivityEvent",
            "p_row_id": "111222",
            "actor": {
                  "email": "bobert@example.com"
            },
            "id": {
                  "applicationName": "drive"
            },
            "type": "acl_change",
            "name": "change_document_visibility",
            "parameters": {
                  "visibility_change": "external",
                  "doc_title": "my shared document",
                  "target_domain": "example.com",
                  "visibility": "people_within_domain_with_link",
                  "new_value": [
                        "people_with_link"
                  ]
            }
      }
  - Name: Doc Became Public - Link (Allowlisted Domain Is Configured)
    ExpectedResult: false
    Mocks:
      - objectName: ALLOWED_DOMAINS
        returnValue: "[\n  \"example.com\"\n]"
    Log:
      {
            "p_log_type": "GSuite.ActivityEvent",
            "p_row_id": "111222",
            "actor": {
                  "email": "bobert@example.com"
            },
            "id": {
                  "applicationName": "drive"
            },
            "type": "acl_change",
            "name": "change_document_visibility",
            "parameters": {
                  "visibility_change": "external",
                  "doc_title": "my shared document",
                  "target_domain": "example.com",
                  "visibility": "people_within_domain_with_link",
                  "new_value": [
                        "people_with_link"
                  ]
            }
      }
  - Name: Doc Became Private - Link
    ExpectedResult: false
    Log:
      {
            "p_log_type": "GSuite.ActivityEvent",
            "p_row_id": "111222",
            "actor": {
                  "email": "bobert@example.com"
            },
            "id": {
                  "applicationName": "drive"
            },
            "type": "acl_change",
            "name": "change_document_visibility",
            "parameters": {
                  "visibility_change": "external",
                  "doc_title": "my shared document",
                  "target_domain": "all",
                  "visibility": "people_with_link",
                  "new_value": [
                        "private"
                  ]
            }
      }
  - Name: Doc Became Public - User
    ExpectedResult: true
    Log:
      {
            "p_log_type": "GSuite.ActivityEvent",
            "actor": {
                  "email": "bobert@example.com"
            },
            "id": {
                  "applicationName": "drive"
            },
            "kind": "admin#reports#activity",
            "ipAddress": "1.1.1.1",
            "type": "acl_change",
            "name": "change_user_access",
            "parameters": {
                  "primary_event": true,
                  "visibility_change": "external",
                  "target_user": "someone@random.com",
                  "old_value": [
                        "none"
                  ],
                  "new_value": [
                        "can_view"
                  ],
                  "old_visibility": "people_within_domain_with_link",
                  "doc_title": "Hosted Accounts",
                  "visibility": "shared_externally"
            }
      }
  - Name: Doc Became Public - User (Multiple)
    ExpectedResult: true
    Log:
      {
            "p_log_type": "GSuite.ActivityEvent",
            "actor": {
                  "email": "bobert@example.com"
            },
            "id": {
                  "applicationName": "drive"
            },
            "kind": "admin#reports#activity",
            "ipAddress": "1.1.1.1",
            "type": "acl_change",
            "name": "change_user_access",
            "parameters": {
                  "primary_event": true,
                  "visibility_change": "external",
                  "target_user": "someone@random.com",
                  "old_value": [
                        "none"
                  ],
                  "new_value": [
                        "can_view"
                  ],
                  "old_visibility": "people_within_domain_with_link",
                  "doc_title": "Hosted Accounts",
                  "visibility": "shared_externally"
            }
      }
  - Name: Doc Inherits Folder Permissions
    ExpectedResult: false
    Log:
      {
            "p_log_type": "GSuite.ActivityEvent",
            "p_row_id": "111222",
            "actor": {
                  "email": "bobert@example.com"
            },
            "id": {
                  "applicationName": "drive"
            },
            "type": "acl_change",
            "name": "change_user_access_hierarchy_reconciled",
            "parameters": {
                  "visibility_change": "internal"
            }
      }
  - Name: Doc Inherits Folder Permissions - Sharing Link
    ExpectedResult: false
    Log:
      {
            "p_log_type": "GSuite.ActivityEvent",
            "p_row_id": "111222",
            "actor": {
                  "email": "bobert@example.com"
            },
            "id": {
                  "applicationName": "drive"
            },
            "type": "acl_change",
            "name": "change_document_access_scope_hierarchy_reconciled",
            "parameters": {
                  "visibility_change": "internal"
            }
      }
  - Name: Doc Became Public - Public email provider
    ExpectedResult: true
    Log:
      {
            "p_log_type": "GSuite.ActivityEvent",
            "actor": {
                  "email": "bobert@example.com"
            },
            "id": {
                  "applicationName": "drive"
            },
            "kind": "admin#reports#activity",
            "ipAddress": "1.1.1.1",
            "type": "acl_change",
            "name": "change_user_access",
            "parameters": {
                  "primary_event": true,
                  "visibility_change": "external",
                  "target_user": "someone@yandex.com",
                  "old_value": [
                        "none"
                  ],
                  "new_value": [
                        "can_view"
                  ],
                  "old_visibility": "people_within_domain_with_link",
                  "doc_title": "Hosted Accounts",
                  "visibility": "shared_externally"
            }
      }
  - Name: Doc Shared With Multiple Users All From ALLOWED_DOMAINS
    ExpectedResult: false
    Mocks:
      - objectName: ALLOWED_DOMAINS
        returnValue: "[\n  \"example.com\", \"notexample.com\"\n]"
    Log:
      {
            "p_log_type": "GSuite.ActivityEvent",
            "actor": {
                  "email": "bobert@example.com"
            },
            "id": {
                  "applicationName": "drive"
            },
            "kind": "admin#reports#activity",
            "ipAddress": "1.1.1.1",
            "type": "acl_change",
            "name": "change_user_access",
            "parameters": {
                  "primary_event": true,
                  "visibility_change": "external",
                  "target_user": "someone@notexample.com",
                  "old_value": [
                        "none"
                  ],
                  "new_value": [
                        "can_view"
                  ],
                  "old_visibility": "people_within_domain_with_link",
                  "doc_title": "Hosted Accounts",
                  "visibility": "shared_externally"
            }
      }

Detection logic

Condition

id.applicationName eq "drive"
name not in ["change_user_access_hierarchy_reconciled", "change_document_access_scope_hierarchy_reconciled"]
(type eq "acl_change" and name eq "change_document_visibility") or (type eq "acl_change" and name eq "change_user_access")

This rule also runs imperative logic the parser cannot express as a filter; the conditions above are the structured part it could extract.

Exclusions

Top-level NOT(...) conjuncts: predicates this rule actively suppresses.

Field	Kind	Excluded values
`name`	in	`change_document_access_scope_hierarchy_reconciled`, `change_user_access_hierarchy_reconciled`

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
`id.applicationName`	eq	`drive`
`name`	eq	`change_document_visibility` `change_user_access`
`type`	eq	`acl_change`

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
`email`	`actor.email`

`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)