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P4T12ICK
64 lines
2.6 KiB
YAML
64 lines
2.6 KiB
YAML
name: Windows Disable LogOff Button Through Registry
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id: b2fb6830-9ed1-11ec-9fcb-acde48001122
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version: 1
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date: '2022-03-08'
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author: Teoderick Contreras, Splunk
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status: production
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type: Anomaly
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description: This analytic is to detect a suspicious registry modification to disable
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logoff feature in windows host. This registry when enable will prevent users to
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log off of the system by using any method, including programs run from the command
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line, such as scripts. It also disables or removes all menu items and buttons that
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log the user off of the system. This technique was seen abused by ransomware malware
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to make the compromised host un-useful and hard to remove other registry modification
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made on the machine that needs restart to take effect. This windows feature may
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implement by administrator in some server where shutdown is critical. In that scenario
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filter of machine and users that can modify this registry is needed.
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data_source:
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- Sysmon Event ID 13
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search:
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selection1:
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Registry.registry_value_name:
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- NoLogOff
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- StartMenuLogOff
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TargetObject: '*\\SOFTWARE\\Microsoft\\Windows\\CurrentVersion\\Policies\\Explorer\\*'
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Details: '0x00000001'
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condition: selection1
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how_to_implement: To successfully implement this search you need to be ingesting information
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on process that include the name of the Filesystem responsible for the changes from
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your endpoints into the `Endpoint` datamodel in the `Processes` and `Registry` node.
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known_false_positives: This windows feature may implement by administrator in some
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server where shutdown is critical. In that scenario filter of machine and users
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that can modify this registry is needed.
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references:
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- https://www.hybrid-analysis.com/sample/e2d4018fd3bd541c153af98ef7c25b2bf4a66bc3bfb89e437cde89fd08a9dd7b/5b1f4d947ca3e10f22714774
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- https://malwiki.org/index.php?title=DigiPop.xp
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- https://www.trendmicro.com/vinfo/be/threat-encyclopedia/search/js_noclose.e/2
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tags:
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analytic_story:
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- Ransomware
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- Windows Registry Abuse
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asset_type: Endpoint
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confidence: 70
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impact: 70
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message: Registry modification in "NoLogOff" on $dest$
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mitre_attack_id:
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- T1112
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observable:
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- name: dest
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type: Endpoint
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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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risk_score: 49
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security_domain: endpoint
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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/T1112/ransomware_disable_reg/sysmon.log
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source: XmlWinEventLog:Microsoft-Windows-Sysmon/Operational
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sourcetype: xmlwineventlog
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