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https://github.com/splunk/security_content
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Patrick
82 lines
2.7 KiB
YAML
82 lines
2.7 KiB
YAML
name: AWS Multi-Factor Authentication Disabled
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id: 374832b1-3603-420c-b456-b373e24d34c0
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version: 2
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date: '2024-05-15'
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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 detects attempts to disable multi-factor authentication
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(MFA) for an AWS IAM user. It leverages AWS CloudTrail logs to identify events where
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MFA devices are deleted or deactivated. This activity is significant because disabling
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MFA can indicate an adversary attempting to weaken account security, potentially
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to maintain persistence using a compromised account. If confirmed malicious, this
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action could allow attackers to retain access to the AWS environment without detection,
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posing a significant risk to the security and integrity of the cloud infrastructure.
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data_source:
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- AWS CloudTrail DeleteVirtualMFADevice
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- AWS CloudTrail DeactivateMFADevice
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search: '`cloudtrail` (eventName= DeleteVirtualMFADevice OR eventName=DeactivateMFADevice)
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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 userAgent eventID awsRegion user_name userIdentity.arn status | `security_content_ctime(firstTime)`
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| `security_content_ctime(lastTime)` | `aws_multi_factor_authentication_disabled_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: AWS Administrators may disable MFA but it is highly unlikely
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for this event to occur without prior notice to the company
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references:
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- https://attack.mitre.org/techniques/T1621/
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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 disabled Multi-Factor authentication for AWS account
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$aws_account_id$
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mitre_attack_id:
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- T1586
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- T1586.003
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- T1621
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- T1556
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- T1556.006
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observable:
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- name: aws_account_id
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type: Other
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role:
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- Victim
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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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- errorMessage
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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/T1621/aws_mfa_disabled/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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