Added a single detection back that we will test.

detections/endpoint/7zip_commandline_to_smb_share_path.yml

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+name: 7zip CommandLine To SMB Share Path
+id: 01d29b48-ff6f-11eb-b81e-acde48001122
+version: 1
+date: '2021-08-17'
+author: Teoderick Contreras, Splunk
+type: Hunting
+datamodel:
+- Endpoint
+description: This search is to detect a suspicious 7z process with commandline pointing
+  to SMB network share. This technique was seen in CONTI LEAK tools where it use 7z
+  to archive a sensitive files and place it in network share tmp folder. This search
+  is a good hunting query that may give analyst a hint why specific user try to archive
+  a file pointing to SMB user which is un usual.
+search: '| tstats `security_content_summariesonly` count min(_time) as firstTime max(_time)
+  as lastTime from datamodel=Endpoint.Processes where (Processes.process_name ="7z.exe"
+  OR Processes.process_name = "7za.exe" OR Processes.original_file_name = "7z.exe"
+  OR Processes.original_file_name =  "7za.exe") AND (Processes.process="*\\C$\\*"
+  OR Processes.process="*\\Admin$\\*" OR Processes.process="*\\IPC$\\*") by Processes.original_file_name
+  Processes.parent_process_name Processes.parent_process Processes.process_name Processes.process
+  Processes.parent_process_id Processes.process_id  Processes.dest Processes.user
+  | `drop_dm_object_name(Processes)` | `security_content_ctime(firstTime)` | `security_content_ctime(lastTime)`
+  | `7zip_commandline_to_smb_share_path_filter`'
+how_to_implement: To successfully implement this search, you need to be ingesting
+  logs with the process name, parent process, and command-line executions from your
+  endpoints. If you are using Sysmon, you must have at least version 6.0.4 of the
+  Sysmon TA. Tune and filter known instances where renamed 7z.exe may be used.
+known_false_positives: unknown
+references:
+- https://threadreaderapp.com/thread/1423361119926816776.html
+tags:
+  analytic_story:
+  - Ransomware
+  confidence: 50
+  context:
+  - Source:Endpoint
+  - Stage:Execution
+  dataset:
+  - https://media.githubusercontent.com/media/splunk/attack_data/master/datasets/malware/conti/conti_leak/windows-sysmon_7z.log
+  impact: 50
+  kill_chain_phases:
+  - Exploitation
+  message: archive process $process_name$ with suspicious cmdline $process$ in host
+    $dest$
+  mitre_attack_id:
+  - T1560.001
+  - T1560
+  observable:
+  - name: dest
+    type: Hostname
+    role:
+    - Victim
+  - name: SourceImage
+    type: Process
+    role:
+    - Attacker
+  product:
+  - Splunk Enterprise
+  - Splunk Enterprise Security
+  - Splunk Cloud
+  required_fields:
+  - _time
+  - Processes.dest
+  - Processes.user
+  - Processes.parent_process
+  - Processes.parent_process_name
+  - Processes.process_name
+  - Processes.process
+  - Processes.process_id
+  - Processes.parent_process_id
+  risk_score: 25
+  security_domain: endpoint
+  asset_type: Endpoint

tests/endpoint/7zip_commandline_to_smb_share_path.test.yml

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+name: 7zip CommandLine To SMB Share Path Unit Test
+tests:
+- name: 7zip CommandLine To SMB Share Path
+  file: endpoint/7zip_commandline_to_smb_share_path.yml
+  pass_condition: '| stats count | where count > 0'
+  earliest_time: -24h
+  latest_time: now
+  attack_data:
+  - file_name: windows-sysmon_7z.log
+    data: https://media.githubusercontent.com/media/splunk/attack_data/master/datasets/malware/conti/conti_leak/windows-sysmon_7z.log
+    source: XmlWinEventLog:Microsoft-Windows-Sysmon/Operational
+    sourcetype: xmlwineventlog