mirror of
https://github.com/splunk/security_content
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Bhavin Patel
73 lines
2.6 KiB
YAML
73 lines
2.6 KiB
YAML
name: GCP Multi-Factor Authentication Disabled
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id: b9bc5513-6fc1-4821-85a3-e1d81e451c83
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version: 3
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date: '2024-05-25'
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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 detects an attempt to disable multi-factor authentication
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(MFA) for a Google Cloud Platform (GCP) user. It leverages Google Workspace Admin
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log events, specifically the `UNENROLL_USER_FROM_STRONG_AUTH` command. This activity
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is significant because disabling MFA can allow an adversary to maintain persistence
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within the environment using a compromised account without raising suspicion. If
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confirmed malicious, this action could enable attackers to bypass additional security
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layers, potentially leading to unauthorized access, data exfiltration, or further
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exploitation of the compromised account.
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data_source:
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- Google Workspace
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search: '`gws_reports_admin` command=UNENROLL_USER_FROM_STRONG_AUTH | stats count
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min(_time) as firstTime max(_time) as lastTime by user, command, actor.email, status,
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id.applicationName, event.name, vendor_account, action | `security_content_ctime(firstTime)`
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| `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:
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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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