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detections/endpoint/windows_lateral_tool_transfer_remcom.yml

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+name: Windows Lateral Tool Transfer RemCom
+id: e373a840-5bdc-47ef-b2fd-9cc7aaf387f0
+version: 1
+date: '2023-03-20'
+author: Michael Haag, Splunk
+type: TTP
+datamodel:
+- Endpoint
+description: This analytic identifies the use of RemCom.exe - The open source psexec. This utility provides the ability to move laterally and run scripts or commands remotely.
+search: '| tstats `security_content_summariesonly` count min(_time) as firstTime max(_time)
+  as lastTime from datamodel=Endpoint.Processes where (Processes.process_name=remcom.exe OR Processes.original_file_name=RemCom.exe) Processes.process="*\\*" Processes.process IN ("*/user:*", "*/pwd:*")
+   by Processes.dest Processes.user Processes.parent_process_name Processes.process_name Processes.original_file_name
+  Processes.process Processes.process_id Processes.parent_process_id
+  | `drop_dm_object_name(Processes)` 
+  | `security_content_ctime(firstTime)`
+  | `security_content_ctime(lastTime)` | `windows_lateral_tool_transfer_remcom_filter`'
+how_to_implement: To successfully implement this search you need to be ingesting information on process that include the name of the process responsible for the changes from your endpoints into the `Endpoint` datamodel in the `Processes` node. In addition, confirm the latest CIM App 4.20 or higher is installed and the latest TA for the endpoint product.
+known_false_positives: False positives may be present based on Administrative use. Filter as needed.
+references:
+  - https://www.crowdstrike.com/blog/bears-midst-intrusion-democratic-national-committee/
+  - https://github.com/kavika13/RemCom
+tags:
+  analytic_story:
+  - Active Directory Discovery
+  asset_type: Endpoint
+  cis20:
+  - CIS 3
+  - CIS 5
+  - CIS 16
+  confidence: 50
+  context:
+  - Source:Endpoint
+  - Stage:Defense Evasion
+  dataset:
+  - https://media.githubusercontent.com/media/splunk/attack_data/master/datasets/attack_techniques/T1570/remcom/remcom_windows-sysmon.log
+  impact: 80
+  kill_chain_phases:
+  - Installation
+  message: An instance of $parent_process_name$ spawning $process_name$ was identified on endpoint $dest$ by user $user$ attempting to move laterally.
+  mitre_attack_id:
+  - T1570
+  nist:
+  - DE.CM
+  observable:
+  - name: user
+    type: User
+    role:
+    - Victim
+  - name: dest
+    type: Hostname
+    role:
+    - Victim
+  - name: parent_process_name
+    type: Process
+    role:
+    - Parent Process
+  - name: process_name
+    type: Process
+    role:
+    - Child Process
+  product:
+  - Splunk Enterprise
+  - Splunk Enterprise Security
+  - Splunk Cloud
+  required_fields:
+  - _time
+  - Processes.dest
+  - Processes.user
+  - Processes.parent_process_name #parent process name
+  - Processes.parent_process #parent cmdline
+  - Processes.original_file_name
+  - Processes.process_name #process name
+  - Processes.process #process cmdline
+  - Processes.process_id
+  - Processes.parent_process_path
+  - Processes.process_path
+  - Processes.parent_process_id
+  risk_score: 40
+  security_domain: endpoint

detections/endpoint/windows_service_create_remcomsvc.yml

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+name: Windows Service Create RemComSvc
+id: 0be4b5d6-c449-4084-b945-2392b519c33b
+version: 1
+date: '2023-03-20'
+author: Michael Haag, Splunk
+type: Anomaly
+datamodel: []
+description: The following analytic identifies RemComSvc installed on an endpoint. This typically occurs when someone is moving laterally with RemCom.exe.
+search: '`wineventlog_system` EventCode=7045 ServiceName="RemCom Service" | stats count min(_time) as firstTime max(_time) as lastTime by
+  dest ImagePath ServiceName ServiceType   | `security_content_ctime(firstTime)`
+  | `security_content_ctime(lastTime)` | `windows_service_create_remcomsvc_filter`'
+how_to_implement: To implement this analytic, the Windows EventCode 7045 will need to be logged. The Windows TA for Splunk is also recommended.
+known_false_positives: False positives may be present, filter as needed based on administrative activity.
+references:
+  - https://www.crowdstrike.com/blog/bears-midst-intrusion-democratic-national-committee/
+  - https://github.com/kavika13/RemCom
+tags:
+  analytic_story:
+  - Active Directory Discovery
+  asset_type: Endpoint
+  cis20:
+  - CIS 3
+  - CIS 5
+  - CIS 16
+  confidence: 80
+  context:
+  - Source:Endpoint
+  - Stage:Persistence
+  dataset:
+  - https://media.githubusercontent.com/media/splunk/attack_data/master/datasets/attack_techniques/T1543.003/atomic_red_team/remcom_windows-system.log
+  impact: 40
+  kill_chain_phases:
+  - Installation
+  message:  A new service was created related to RemCom on $dest$.
+  mitre_attack_id:
+  - T1543.003
+  - T1543
+  nist:
+  - DE.CM
+  observable:
+  - name: dest
+    type: Endpoint
+    role:
+    - Victim
+  product:
+  - Splunk Enterprise
+  - Splunk Enterprise Security
+  - Splunk Cloud
+  required_fields:
+  - _time
+  - dest 
+  - EventCode 
+  - ImagePath 
+  - ServiceName 
+  - ServiceType 
+  risk_score: 32
+  security_domain: endpoint

tests/endpoint/windows_lateral_tool_transfer_remcom.test.yml

@@ -1,13 +1,13 @@
-name: Hunting 3CXDesktopApp Software Unit Test
+name: Windows Lateral Tool Transfer RemCom Unit Test
 tests:
-- name: Hunting 3CXDesktopApp Software
-  file: endpoint/hunting_3cxdesktopapp_software.yml
+- name: Windows Lateral Tool Transfer RemCom
+  file: endpoint/windows_lateral_tool_transfer_remcom.yml
   pass_condition: '| stats count | where count > 0'
   earliest_time: -24h
   latest_time: now
   attack_data:
-  - file_name: 3cx_windows-sysmon.log
-    data: https://media.githubusercontent.com/media/splunk/attack_data/master/datasets/attack_techniques/T1195.002/3CX/3cx_windows-sysmon.log
+  - file_name: remcom_windows-sysmon.log
+    data: https://media.githubusercontent.com/media/splunk/attack_data/master/datasets/attack_techniques/T1570/remcom/remcom_windows-sysmon.log
     source: XmlWinEventLog:Microsoft-Windows-Sysmon/Operational
     sourcetype: xmlwineventlog
     update_timestamp: true

tests/endpoint/windows_service_create_remcomsvc.test.yml

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+name: Windows Service Create RemComSvc Unit Test
+tests:
+- name: Windows Service Create RemComSvc
+  file: endpoint/windows_service_create_remcomsvc.yml
+  pass_condition: '| stats count | where count > 0'
+  earliest_time: -24h
+  latest_time: now
+  attack_data:
+  - file_name: remcom_windows-system.log
+    data: https://media.githubusercontent.com/media/splunk/attack_data/master/datasets/attack_techniques/T1543.003/atomic_red_team/remcom_windows-system.log
+    source: XmlWinEventLog:System
+    sourcetype: XmlWinEventLog
+    update_timestamp: true