mirror of
https://github.com/splunk/security_content
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ljstella
68 lines
3.5 KiB
YAML
68 lines
3.5 KiB
YAML
name: GCP Multi-Factor Authentication Disabled
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id: b9bc5513-6fc1-4821-85a3-e1d81e451c83
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version: 13
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creation_date: '2022-10-14'
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modification_date: '2026-05-13'
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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 (MFA) for a Google Cloud Platform (GCP) user. It leverages Google Workspace Admin log events, specifically the `UNENROLL_USER_FROM_STRONG_AUTH` command. This activity is significant because disabling MFA can allow an adversary to maintain persistence within the environment using a compromised account without raising suspicion. If confirmed malicious, this action could enable attackers to bypass additional security layers, potentially leading to unauthorized access, data exfiltration, or further exploitation of the compromised account.
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data_source:
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- Google Workspace
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search: |-
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`gws_reports_admin` command=UNENROLL_USER_FROM_STRONG_AUTH
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| stats count min(_time) as firstTime max(_time) as lastTime
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BY user, command, actor.email,
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status, id.applicationName, event.name,
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vendor_account, action
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| `security_content_ctime(firstTime)`
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| `security_content_ctime(lastTime)`
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| `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 Workspace from Splunkbase (https://splunkbase.splunk.com/app/5556) which allows Splunk administrators to collect Google Workspace event data in Splunk using Google 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 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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drilldown_searches:
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- name: View the detection results for - "$user$"
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search: '%original_detection_search% | search user = "$user$"'
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earliest_offset: $info_min_time$
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latest_offset: $info_max_time$
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- name: View risk events for the last 7 days for - "$user$"
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search: '| from datamodel Risk.All_Risk | search normalized_risk_object IN ("$user$") | stats count min(_time) as firstTime max(_time) as lastTime values(search_name) as "Search Name" values(risk_message) as "Risk Message" values(analyticstories) as "Analytic Stories" values(annotations._all) as "Annotations" values(annotations.mitre_attack.mitre_tactic) as "ATT&CK Tactics" by normalized_risk_object | `security_content_ctime(firstTime)` | `security_content_ctime(lastTime)`'
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earliest_offset: 7d
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latest_offset: "0"
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finding:
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title: MFA disabled for User $user$ initiated by $actor.email$
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entity:
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field: actor.email
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type: user
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score: 50
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intermediate_findings:
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entities:
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- field: user
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type: user
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score: 50
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message: MFA disabled for User $user$ initiated by $actor.email$
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analytic_story:
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- GCP Account Takeover
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- Scattered Lapsus$ Hunters
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asset_type: GCP
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mitre_attack_id:
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- T1556.006
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- T1586.003
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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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category: cloud
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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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test_type: unit
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