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mvelazco
67 lines
2.3 KiB
YAML
67 lines
2.3 KiB
YAML
name: GCP Successful Single-Factor Authentication
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id: 40e17d88-87da-414e-b253-8dc1e4f9555b
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version: 1
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date: '2022-10-12'
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author: Mauricio Velazco, Splunk
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type: TTP
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datamodel: []
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description: 'The following analytic identifies a successful authentication event against Google Cloud Platform for an account without Multi-Factor Authentication
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enabled. This could be evidence of a missconfiguration, a policy violation or an account take over attempt that should be investigated'
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search: ' `gws_reports_login` event.name=login_success NOT `gws_login_mfa_methods`
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| stats values(user) by _time, src_ip, login_challenge_method
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| `gcp_successful_single_factor_authentication_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.
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Specifically, this analytic leverages the User log events.
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known_false_positives: Although not recommended, certain users may be required without multi-factor authentication. Filter as needed
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references:
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- https://attack.mitre.org/techniques/T1078/004/
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- https://support.google.com/a/answer/175197?hl=en
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- https://www.forbes.com/sites/daveywinder/2020/07/08/new-dark-web-audit-reveals-15-billion-stolen-logins-from-100000-breaches-passwords-hackers-cybercrime/?sh=69927b2a180f
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tags:
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analytic_story:
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- GCP Account Takeover
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asset_type: Google Cloud Platform tenant
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cis20:
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- CIS 3
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- CIS 5
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- CIS 16
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confidence: 90
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context:
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- Source:Cloud Data
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- Stage:Initial Access
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dataset:
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- https://media.githubusercontent.com/media/splunk/attack_data/master/datasets/attack_techniques/T1078.004/gcp_single_factor_auth/gws_login.log
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impact: 50
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kill_chain_phases:
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- Exploitation
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message: Successful authentication for user $user$ without MFA
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mitre_attack_id:
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- T1586
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- T1586.003
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- T1078
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- T1078.004
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nist:
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- DE.CM
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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: src_ip
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type: IP Address
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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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- event.name
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- event.parameters{}.multiValue{}
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- user
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- src_ip
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- login_challenge_method
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risk_score: 45
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security_domain: identity
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