mirror of
https://github.com/splunk/security_content
synced 2026-06-08 17:32:49 +00:00
Bhavin Patel
66 lines
2.4 KiB
YAML
66 lines
2.4 KiB
YAML
name: O365 Disable MFA
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id: c783dd98-c703-4252-9e8a-f19d9f5c949e
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version: 3
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date: '2024-05-11'
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author: Rod Soto, Splunk
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status: production
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type: TTP
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description: The following analytic identifies instances where Multi-Factor Authentication
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(MFA) is disabled for a user within the Office 365 environment. It leverages O365
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audit logs, specifically focusing on events related to MFA settings. Disabling MFA
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removes a critical security layer, making accounts more vulnerable to unauthorized
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access. If confirmed malicious, this activity could indicate an attacker attempting
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to maintain persistence or an insider threat, significantly increasing the risk
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of unauthorized access. Immediate investigation is required to validate the reason
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for disabling MFA, potentially re-enable it, and assess any other suspicious activities
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related to the affected account.
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data_source:
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- O365 Disable Strong Authentication.
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search: '`o365_management_activity` Operation="Disable Strong Authentication." | stats
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count earliest(_time) as firstTime latest(_time) as lastTime by UserType Operation
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UserId ResultStatus object | rename UserType AS user_type, Operation AS action,
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UserId AS src_user, object AS user, ResultStatus AS result | `security_content_ctime(firstTime)`
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| `security_content_ctime(lastTime)` | `o365_disable_mfa_filter`'
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how_to_implement: You must install the Splunk Microsoft Office 365 add-on. This search
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works with o365:management:activity
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known_false_positives: Unless it is a special case, it is uncommon to disable MFA
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or Strong Authentication
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references:
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- https://attack.mitre.org/techniques/T1556/
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tags:
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analytic_story:
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- Office 365 Persistence Mechanisms
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asset_type: O365 Tenant
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confidence: 80
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impact: 80
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message: User $src_user$ has executed an operation $action$ for user $user$
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mitre_attack_id:
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- T1556
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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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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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- Operation
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- UserType
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- user
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- status
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- signature
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- dest
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- ResultStatus
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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/T1556/o365_disable_mfa/o365_disable_mfa.json
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sourcetype: o365:management:activity
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source: o365
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