mirror of
https://github.com/splunk/security_content
synced 2026-06-08 17:32:49 +00:00
Eric McGinnis
67 lines
3.4 KiB
YAML
67 lines
3.4 KiB
YAML
name: AWS Multi-Factor Authentication Disabled
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id: 374832b1-3603-420c-b456-b373e24d34c0
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version: 12
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creation_date: '2022-10-04'
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modification_date: '2026-05-13'
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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 (MFA) for an AWS IAM user. It leverages AWS CloudTrail logs to identify events where MFA devices are deleted or deactivated. This activity is significant because disabling MFA can indicate an adversary attempting to weaken account security, potentially to maintain persistence using a compromised account. If confirmed malicious, this action could allow attackers to retain access to the AWS environment without detection, 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: |-
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`cloudtrail` (eventName= DeleteVirtualMFADevice OR eventName=DeactivateMFADevice)
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| rename user_name as user
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| stats count min(_time) as firstTime max(_time) as lastTime
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BY signature dest user
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user_agent src vendor_account
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vendor_region vendor_product
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| `security_content_ctime(firstTime)`
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| `security_content_ctime(lastTime)`
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| `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 requires AWS CloudTrail logs.
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known_false_positives: AWS Administrators may disable MFA but it is highly unlikely 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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drilldown_searches:
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- name: View the detection results for - "$vendor_account$" and "$user$"
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search: '%original_detection_search% | search vendor_account = "$vendor_account$" 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 - "$vendor_account$" and "$user$"
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search: '| from datamodel Risk.All_Risk | search normalized_risk_object IN ("$vendor_account$", "$user$") | 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: User $user$ has disabled Multi-Factor authentication for AWS account $vendor_account$
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entity:
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field: user
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type: user
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score: 50
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threat_objects:
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- field: src
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type: ip_address
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analytic_story:
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- AWS Identity and Access Management Account Takeover
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- Scattered Lapsus$ Hunters
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asset_type: AWS Account
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mitre_attack_id:
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- T1556.006
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- T1586.003
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- T1621
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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: 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: 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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test_type: unit
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