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Bhavin Patel
78 lines
2.7 KiB
YAML
78 lines
2.7 KiB
YAML
name: AWS Successful Single-Factor Authentication
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id: a520b1fe-cc9e-4f56-b762-18354594c52f
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version: 2
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date: '2024-05-12'
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author: Bhavin Patel, Splunk
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status: production
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type: TTP
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description: The following analytic identifies a successful Console Login authentication
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event for an AWS IAM user account without Multi-Factor Authentication (MFA) enabled.
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It leverages AWS CloudTrail logs to detect instances where MFA was not used during
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login. This activity is significant as it may indicate a misconfiguration, policy
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violation, or potential account takeover attempt. If confirmed malicious, an attacker
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could gain unauthorized access to the AWS environment, potentially leading to data
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exfiltration, resource manipulation, or further privilege escalation.
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data_source:
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- AWS CloudTrail ConsoleLogin
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search: '`cloudtrail` eventName= ConsoleLogin errorCode=success "additionalEventData.MFAUsed"=No
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| stats count min(_time) as firstTime max(_time) as lastTime by src eventName eventSource
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aws_account_id errorCode additionalEventData.MFAUsed userAgent eventID awsRegion
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user_name userIdentity.arn | `security_content_ctime(firstTime)` | `security_content_ctime(lastTime)`
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| `aws_successful_single_factor_authentication_filter`'
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how_to_implement: The Splunk AWS Add-on is required to utilize this data. The search
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requires AWS CloudTrail logs.
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known_false_positives: It is possible that some accounts do not have MFA enabled for
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the AWS account however its agaisnt the best practices of securing AWS.
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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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- https://aws.amazon.com/what-is/mfa/
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tags:
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analytic_story:
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- AWS Identity and Access Management Account Takeover
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asset_type: AWS Account
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confidence: 80
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impact: 80
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message: User $user_name$ has successfully logged into an AWS Console without Multi-Factor
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Authentication from $src$
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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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observable:
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- name: user_name
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type: User
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role:
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- Victim
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- name: src
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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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- src
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- eventName
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- eventSource
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- aws_account_id
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- errorCode
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- additionalEventData.MFAUsed
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- userAgent
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- eventID
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- awsRegion
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- user_name
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- userIdentity.arn
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risk_score: 64
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security_domain: threat
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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/T1078.004/aws_login_sfa/cloudtrail.json
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sourcetype: aws:cloudtrail
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source: aws_cloudtrail
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update_timestamp: true
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