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detections/endpoint/detect_remote_access_software_usage_registry.yml

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+name: Detect Remote Access Software Usage Registry
+id: 33804986-25dd-43cf-bb6b-dc14956c7cbc
+version: 1
+date: '2024-11-21'
+author: Steven Dick
+status: production
+type: Anomaly
+description: The following analytic detects when a known remote access software is added to common persistence locations on a device within the environment. Adversaries use these utilities to retain remote access capabilities to the environment. Utilities in the lookup include AnyDesk, GoToMyPC, LogMeIn, TeamViewer and much more. Review the lookup for the entire list and add any others.
+data_source: 
+- Sysmon EventID 12
+- Sysmon EventID 13
+search: '| tstats `security_content_summariesonly` latest(Registry.process_guid) as process_guid  count min(_time) as firstTime max(_time) as lastTime FROM datamodel=Endpoint.Registry where (Registry.registry_path="*\\Microsoft\\Windows\\CurrentVersion\\Run*" OR (Registry.registry_path="*\\SYSTEM\\CurrentControlSet\\Services\\*" AND Registry.registry_value_name="ImagePath")) by Registry.dest Registry.user Registry.registry_path Registry.registry_value_name Registry.registry_value_data Registry.registry_key_name 
+| `drop_dm_object_name(Registry)` 
+| `security_content_ctime(firstTime)` 
+| `security_content_ctime(lastTime)` 
+| rex field=registry_value_data "(\")?.+\\\(?<file_name_1>[^\"=]+\.[^\" ]{1,5})(\")?"
+| rex field=registry_value_data "(?<file_name_2>[^\.]+\.[^\" ]{1,5}$)"
+| eval file_name = coalesce(file_name_1,file_name_2)
+| lookup remote_access_software remote_utility AS file_name OUTPUT isutility, description as signature, comment_reference as desc, category 
+| search isutility = TRUE
+| `remote_access_software_usage_exceptions`
+| `detect_remote_access_software_usage_registry_filter`'
+how_to_implement: The detection is based on data that originates from Endpoint Detection and Response (EDR) agents. These agents are designed to provide security-related telemetry from the endpoints where the agent is installed. To implement this search, you must ingest logs that contain the file path, file name, and the user that created the file. These logs must be processed using the appropriate Splunk Technology Add-ons that are specific to the EDR product. The logs must also be mapped to the `Registry` node of the `Endpoint` data model. Use the Splunk Common Information Model (CIM) to normalize the field names and speed up the data modeling process. The "exceptions" macro leverages both an Assets and Identities lookup, as well as a KVStore collection called "remote_software_exceptions" that lets you track and maintain device-based exceptions for this set of detections.
+known_false_positives: Known or approved applications used by the organization or usage of built-in functions. Known false positives can be added to the remote_access_software_usage_exception.csv lookup to globally suppress these situations across all remote access content
+references:
+- https://attack.mitre.org/techniques/T1219/
+- https://thedfirreport.com/2022/08/08/bumblebee-roasts-its-way-to-domain-admin/
+- https://thedfirreport.com/2022/11/28/emotet-strikes-again-lnk-file-leads-to-domain-wide-ransomware/
+drilldown_searches:
+- name: View the detection results for - "$dest$" and "$user$"
+  search: '%original_detection_search% | search dest = "$dest$" user = "$user$"'
+  earliest_offset: $info_min_time$
+  latest_offset: $info_max_time$
+- name: View risk events for the last 7 days for - "$dest$" and "$user$"
+  search: '| from datamodel Risk.All_Risk | search normalized_risk_object IN ("$dest$","$user$") starthoursago=168  | stats count min(_time) as firstTime max(_time) as lastTime values(search_name) as "Search Name" values(risk_message) as "Risk Message" values(analyticstories) as "Analytic Stories" values(annotations._all) as "Annotations" values(annotations.mitre_attack.mitre_tactic) as "ATT&CK Tactics" by normalized_risk_object | `security_content_ctime(firstTime)` | `security_content_ctime(lastTime)`'
+  earliest_offset: $info_min_time$
+  latest_offset: $info_max_time$
+- name: Investigate registry changes on $dest$ 
+  search: '| from datamodel:Endpoint.Registry| search dest=$dest$ registry_path=$registry_path$'
+  earliest_offset: $info_min_time$
+  latest_offset: $info_max_time$
+tags:
+  analytic_story: 
+  - Insider Threat
+  - Command And Control
+  - Ransomware
+  - Gozi Malware
+  - CISA AA24-241A
+  asset_type: Endpoint
+  confidence: 50
+  impact: 50
+  message: A process for a known remote access software [$signature$] was detected on $dest$
+  mitre_attack_id: 
+  - T1219
+  observable: 
+  - name: dest
+    type: Hostname
+    role:
+    - Victim
+  - name: user
+    type: User
+    role:
+    - Victim
+  - name: registry_path
+    type: Other
+    role:
+    - Attacker
+  - name: signature
+    type: Other
+    role:
+    - Attacker
+  product: 
+  - Splunk Enterprise
+  - Splunk Enterprise Security
+  - Splunk Cloud
+  required_fields: 
+  - _time
+  - Registry.dest 
+  - Registry.user 
+  - Registry.registry_path 
+  - Registry.registry_value_name 
+  - Registry.registry_value_data 
+  - Registry.registry_key_name
+  risk_score: 25
+  security_domain: endpoint
+  manual_test: This detection uses A&I lookups from Enterprise Security.
+tests:
+- name: True Positive Test
+  attack_data:
+  - data: https://media.githubusercontent.com/media/splunk/attack_data/master/datasets/attack_techniques/T1219/screenconnect/screenconnect_sysmon.log
+    source: XmlWinEventLog:Microsoft-Windows-Sysmon/Operational
+    sourcetype: XmlWinEventLog