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mvelazco
66 lines
2.1 KiB
YAML
66 lines
2.1 KiB
YAML
name: GCP Authentication Failed During MFA Challenge
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id: 345f7e1d-a3fe-4158-abd8-e630f9878323
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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 an authentication attempt event against a Google Cloud Platform tenant that fails during the Multi Factor Authentication challenge.
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This behavior may represent an adversary trying to authenticate with compromised credentials for an account that has multi-factor authentication enabled. '
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search: ' `gws_reports_login` event.name=login_failure `gws_login_mfa_methods`
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| stats values(user) by _time, src_ip, login_challenge_method
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| `gcp_authentication_failed_during_mfa_challenge_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: Legitimate users may miss to reply the MFA challenge within the time window or deny it by mistake.
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references:
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- https://attack.mitre.org/techniques/T1621/
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- https://attack.mitre.org/techniques/T1078/004/
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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/T1621/gcp_failed_mfa/gws_login.log
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impact: 60
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kill_chain_phases:
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- Exploitation
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message: User $user$ failed to pass MFA challenge
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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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- T1621
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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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- user
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- src_ip
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- login_challenge_method
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- event.parameters{}.multiValue{}
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risk_score: 54
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security_domain: identity
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