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Added detection testing service results inAuto Admin Logon Registry Entry
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@@ -6,23 +6,25 @@ author: Teoderick Contreras, Splunk
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type: TTP
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datamodel:
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- Endpoint
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description: this search is to detect a suspicious registry modification to implement auto admin logon to a host.
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This technique was seen in BlackMatter ransomware to automatically logon to the compromise host after triggering a safemode boot to continue encrypting the whole network.
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This behavior is not a common practice and really a suspicious TTP or alert need to be consider if found within then network premise.
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search: '| tstats `security_content_summariesonly` count min(_time) as firstTime max(_time) as lastTime from datamodel=Endpoint.Registry
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where Registry.registry_path= "*SOFTWARE\\Microsoft\\Windows NT\\CurrentVersion\\Winlogon*" AND Registry.registry_key_name=AutoAdminLogon AND Registry.registry_value_name=1
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by Registry.registry_path Registry.registry_key_name Registry.registry_value_name Registry.dest
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| `drop_dm_object_name(Registry)`
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| `security_content_ctime(firstTime)`
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|`security_content_ctime(lastTime)`
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| `auto_admin_logon_registry_entry_filter`'
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description: this search is to detect a suspicious registry modification to implement
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auto admin logon to a host. This technique was seen in BlackMatter ransomware to
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automatically logon to the compromise host after triggering a safemode boot to
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continue encrypting the whole network. This behavior is not a common practice and
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really a suspicious TTP or alert need to be consider if found within then network
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premise.
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search: '| tstats `security_content_summariesonly` count min(_time) as firstTime max(_time)
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as lastTime from datamodel=Endpoint.Registry where Registry.registry_path= "*SOFTWARE\\Microsoft\\Windows
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NT\\CurrentVersion\\Winlogon*" AND Registry.registry_key_name=AutoAdminLogon AND
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Registry.registry_value_name=1 by Registry.registry_path Registry.registry_key_name
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Registry.registry_value_name Registry.dest | `drop_dm_object_name(Registry)` | `security_content_ctime(firstTime)`
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|`security_content_ctime(lastTime)` | `auto_admin_logon_registry_entry_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 process responsible for the changes from
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your endpoints into the `Endpoint` datamodel in the `Registry` node. Also make sure
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that this registry was included in your config files ex. sysmon config to be monitored.
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known_false_positives: unknown
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references:
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- https://news.sophos.com/en-us/2021/08/09/blackmatter-ransomware-emerges-from-the-shadow-of-darkside/
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- https://news.sophos.com/en-us/2021/08/09/blackmatter-ransomware-emerges-from-the-shadow-of-darkside/
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tags:
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analytic_story:
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- BlackMatter Ransomware
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@@ -38,22 +40,22 @@ tags:
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- Splunk Cloud
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required_fields:
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- _time
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- Registry.registry_path
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- Registry.registry_key_name
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- Registry.registry_value_name
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- Registry.dest
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- Registry.registry_path
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- Registry.registry_key_name
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- Registry.registry_value_name
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- Registry.dest
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security_domain: endpoint
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impact: 70
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confidence: 90
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# (impact * confidence)/100
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risk_score: 63
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context:
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context:
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- Source:Endpoint
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- Stage:Credential Access
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message: modified registry key $registry_key_name$ with registry value $registry_value_name$ to prepare autoadminlogon
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observable:
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message: modified registry key $registry_key_name$ with registry value $registry_value_name$
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to prepare autoadminlogon
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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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automated_detection_testing: passed
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