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https://github.com/splunk/security_content
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root
91 lines
4.0 KiB
YAML
91 lines
4.0 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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type: Anomaly
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datamodel:
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- Endpoint
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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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search: '| tstats `security_content_summariesonly` count from datamodel=Endpoint.Registry
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where Registry.registry_path= "*\\SOFTWARE\\Microsoft\\Windows\\CurrentVersion\\Policies\\Explorer\\*"
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Registry.registry_value_name IN ("NoLogOff", "StartMenuLogOff") Registry.registry_value_data
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= "0x00000001" by _time span=1h Registry.dest Registry.user Registry.registry_path
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Registry.registry_value_name Registry.registry_value_data Registry.process_guid
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| `drop_dm_object_name(Registry)` |rename process_guid as proc_guid |join proc_guid,
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_time [| tstats `security_content_summariesonly` count FROM datamodel=Endpoint.Processes
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by _time span=1h Processes.process_id Processes.process_name Processes.process Processes.dest
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Processes.parent_process_name Processes.parent_process Processes.process_guid |
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`drop_dm_object_name(Processes)` |rename process_guid as proc_guid | fields _time
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dest user parent_process_name parent_process process_name process_path process proc_guid
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registry_path registry_value_name registry_value_data] | table _time dest user parent_process_name
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parent_process process_name process_path process proc_guid registry_path registry_value_name
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registry_value_data | `windows_disable_logoff_button_through_registry_filter`'
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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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dataset:
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- https://media.githubusercontent.com/media/splunk/attack_data/master/datasets/attack_techniques/T1112/ransomware_disable_reg/sysmon.log
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kill_chain_phases:
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- Exploitation
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mitre_attack_id:
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- T1112
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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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- Registry.registry_key_name
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- Registry.registry_path
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- Registry.registry_value_name
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- Registry.dest Registry.user
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- Processes.process_id
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- Processes.process_name
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- Processes.process
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- Processes.dest
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- Processes.parent_process_name
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- Processes.parent_process
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- Processes.process_guid
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security_domain: endpoint
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impact: 70
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confidence: 70
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risk_score: 49
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context:
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- Source:Endpoint
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- Stage:Defense Evasion
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message: Registry modification in "NoLogOff" on $dest$
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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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nist:
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- DE.CM
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cis20:
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- CIS 3
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- CIS 5
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- CIS 16
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asset_type: Endpoint
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supported_tas:
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- Splunk_TA_microsoft_sysmon
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