mirror of
https://github.com/splunk/security_content
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Eric
71 lines
3.0 KiB
YAML
71 lines
3.0 KiB
YAML
name: O365 Disable MFA
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id: c783dd98-c703-4252-9e8a-f19d9f5c949e
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version: 7
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date: '2025-05-02'
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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."
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| rename UserId as user object as src_user
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| fillnull
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| stats count min(_time) as firstTime max(_time) as lastTime by signature dest user src vendor_account vendor_product src_user
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| `security_content_ctime(firstTime)`
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| `security_content_ctime(lastTime)`
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| `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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drilldown_searches:
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- name: View the detection results for - "$user$"
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search: '%original_detection_search% | search 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 - "$user$"
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search: '| from datamodel Risk.All_Risk | search normalized_risk_object IN ("$user$")
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starthoursago=168 | stats count min(_time) as firstTime max(_time) as lastTime
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values(search_name) as "Search Name" values(risk_message) as "Risk Message" values(analyticstories)
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as "Analytic Stories" values(annotations._all) as "Annotations" values(annotations.mitre_attack.mitre_tactic)
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as "ATT&CK Tactics" by normalized_risk_object | `security_content_ctime(firstTime)`
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| `security_content_ctime(lastTime)`'
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earliest_offset: $info_min_time$
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latest_offset: $info_max_time$
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rba:
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message: User $src_user$ has executed an operation $signature$ for user $user$
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risk_objects:
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- field: user
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type: user
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score: 64
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threat_objects: []
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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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mitre_attack_id:
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- T1556
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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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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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