IMPORTANT: No additional bug fixes or documentation updates will be released for this version. For the latest information, see the current release documentation.

« Appendix R: Downloadable rule update v8.5.2 External User Added to Google Workspace Group »

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Google Workspace Drive Encryption Key(s) Accessed from Anonymous User

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Google Workspace Drive Encryption Key(s) Accessed from Anonymous User

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Detects when an external (anonymous) user has viewed, copied or downloaded an encryption key file from a Google Workspace drive. Adversaries may gain access to encryption keys stored in private drives from rogue access links that do not have an expiration. Access to encryption keys may allow adversaries to access sensitive data or authenticate on behalf of users.

Rule type: eql

Rule indices:

filebeat-*
logs-google_workspace*

Severity: high

Risk score: 73

Runs every: 10m

Searches indices from: now-130m (Date Math format, see also Additional look-back time)

Maximum alerts per execution: 100

References:

https://support.google.com/drive/answer/2494822

Tags:

Elastic
Cloud
Google Workspace
Continuous Monitoring
SecOps
Configuration Audit
Credential Access

Version: 1

Rule authors:

Elastic

Rule license: Elastic License v2

Investigation guide

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### Important Information Regarding Google Workspace Event Lag Times
- As per Google's documentation, Google Workspace administrators may observe lag times ranging from minutes up to 3 days between the time of an event's occurrence and the event being visible in the Google Workspace admin/audit logs.
- This rule is configured to run every 10 minutes with a lookback time of 130 minutes.
- To reduce the risk of false negatives, consider reducing the interval that the Google Workspace (formerly G Suite) Filebeat module polls Google's reporting API for new events.
- By default, `var.interval` is set to 2 hours (2h). Consider changing this interval to a lower value, such as 10 minutes (10m).
- See the following references for further information:
  - https://support.google.com/a/answer/7061566
  - https://www.elastic.co/guide/en/beats/filebeat/current/filebeat-module-google_workspace.html

Rule query

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file where event.dataset == "google_workspace.drive" and event.action : ("copy", "view", "download") and
    google_workspace.drive.visibility: "people_with_link" and source.user.email == "" and
    file.extension: (
        "token","assig", "pssc", "keystore", "pub", "pgp.asc", "ps1xml", "pem", "gpg.sig", "der", "key",
        "p7r", "p12", "asc", "jks", "p7b", "signature", "gpg", "pgp.sig", "sst", "pgp", "gpgz", "pfx", "crt",
        "p8", "sig", "pkcs7", "jceks", "pkcs8", "psc1", "p7c", "csr", "cer", "spc", "ps2xml")

Framework: MITRE ATT&CK^TM

Tactic:
- Name: Credential Access
- ID: TA0006
- Reference URL: https://attack.mitre.org/tactics/TA0006/
Technique:
- Name: Unsecured Credentials
- ID: T1552
- Reference URL: https://attack.mitre.org/techniques/T1552/
Sub-technique:
- Name: Private Keys
- ID: T1552.004
- Reference URL: https://attack.mitre.org/techniques/T1552/004/

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