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https://github.com/splunk/security_content
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Bhavin Patel
65 lines
2.3 KiB
YAML
65 lines
2.3 KiB
YAML
name: GCP Multi-Factor Authentication Disabled
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id: b9bc5513-6fc1-4821-85a3-e1d81e451c83
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version: 2
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date: '2024-01-04'
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author: Bhavin Patel, Mauricio Velazco, Splunk
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status: production
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type: TTP
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description: The following analytic identifies an attempt to disable multi-factor
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authentication for a GCP user. An adversary who has obtained access to an GCP tenant
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may disable multi-factor authentication as a way to plant a backdoor and maintain
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persistence using a valid account. This way the attackers can keep persistance in
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the environment without adding new users.
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data_source: []
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search: '`gws_reports_admin` command=UNENROLL_USER_FROM_STRONG_AUTH | stats count min(_time) as firstTime max(_time) as lastTime by user, command, actor.email, status, id.applicationName, event.name, vendor_account, action | `security_content_ctime(firstTime)` | `security_content_ctime(lastTime)`| `gcp_multi_factor_authentication_disabled_filter`'
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how_to_implement: You must install the latest version of Splunk Add-on for Google
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Workspace from Splunkbase (https://splunkbase.splunk.com/app/5556) which allows
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Splunk administrators to collect Google Workspace event data in Splunk using Google
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Workspace APIs. Specifically, this analytic leverages the Admin log events.
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known_false_positives: Legitimate use case may require for users to disable MFA. Filter
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as needed.
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references:
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- https://support.google.com/cloudidentity/answer/2537800?hl=en
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- https://attack.mitre.org/tactics/TA0005/
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- https://attack.mitre.org/techniques/T1556/
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tags:
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analytic_story:
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- GCP Account Takeover
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asset_type: GCP
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confidence: 90
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impact: 50
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message: MFA disabled for User $user$ initiated by $actor.email$
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mitre_attack_id:
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- T1586
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- T1586.003
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- T1556
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- T1556.006
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observable:
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- name: user
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type: User
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role:
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- Victim
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- name: actor.email
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type: User
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role:
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- Attacker
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product:
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- Splunk Enterprise
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- Splunk Enterprise Security
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- Splunk Cloud
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required_fields:
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- _time
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- actor.email
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- user
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- command
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- status
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risk_score: 45
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security_domain: identity
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tests:
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- name: True Positive Test
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attack_data:
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- data: https://media.githubusercontent.com/media/splunk/attack_data/master/datasets/attack_techniques/T1556/gcp_disable_mfa/gws_admin.log
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source: gws:reports:admin
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sourcetype: gws:reports:admin
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update_timestamp: true
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