word

detections/endpoint/office_spawning_control.yml

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+name: Office Spawning Control
+id: 053e027c-10c7-11ec-8437-acde48001122
+version: 1
+date: '2021-09-08'
+author: Michael Haag, Splunk
+type: TTP
+datamodel:
+- Endpoint
+description: 'The following detection identifies control.exe spawning from an office product. This detection identifies any Windows Office Product spawning `control.exe`.
+  In malicious instances, the command-line of `control.exe` will contain a file path to a .cpl or .inf, related to CVE-2021-40444. In this
+  instance, we narrow our detection down to the Office suite as a parent process.
+  During triage, review all file modifications. Capture and analyze any artifacts
+  on disk. review parallel and child processes to identify further suspicious behavior'
+search: '| tstats `security_content_summariesonly` count min(_time) as firstTime max(_time)
+  as lastTime from datamodel=Endpoint.Processes where Processes.parent_process_name
+  IN ("winword.exe","excel.exe","powerpnt.exe","mspub.exe","visio.exe") Processes.process_name=control.exe
+  by Processes.dest Processes.user Processes.parent_process Processes.process_name
+  Processes.process Processes.process_id Processes.parent_process_id | `drop_dm_object_name(Processes)`
+  | `security_content_ctime(firstTime)`| `security_content_ctime(lastTime)`| `office_spawning_control_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: Limited false positives should be present. 
+references:
+  - https://strontic.github.io/xcyclopedia/library/control.exe-1F13E714A0FEA8887707DFF49287996F.html
+  - https://app.any.run/tasks/36c14029-9df8-439c-bba0-45f2643b0c70/
+  - https://attack.mitre.org/techniques/T1218/011/
+  - https://www.echotrail.io/insights/search/control.exe
+  - https://msrc.microsoft.com/update-guide/vulnerability/CVE-2021-40444
+  - https://github.com/redcanaryco/atomic-red-team/blob/master/atomics/T1218.002/T1218.002.yaml
+tags:
+  analytic_story:
+  - Spearphishing Attachments
+  - Microsoft MSHTML Remote Code Execution CVE-2021-40444
+  dataset: []
+  kill_chain_phases:
+  - Exploitation
+  mitre_attack_id:
+  - T1566.001
+  product:
+  - Splunk Enterprise
+  - Splunk Enterprise Security
+  - Splunk Cloud
+  required_fields:
+  - 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
+  security_domain: endpoint
+  impact: 80
+  confidence: 100
+  # (impact * confidence)/100
+  risk_score: 80
+  context:
+  - Source:Endpoint
+  - Stage:Defense Evasion
+  message: An instance of $parent_process_name$ spawning $process_name$ was identified on endpoint $dest$ clicking a suspicious attachment.
+  observable:
+  - name: dest
+    type: Hostname
+    role:
+    - Victim
+  - name: parent_process_name
+    type: Parent Process
+    role:
+    - Parent Process
+  - name: process_name
+    type: Process
+    role:
+    - Child Process

tests/endpoint/office_spawning_control.test.yml

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+name: Office Spawning Control Unit Test
+tests:
+- name: Office Spawning Control
+  file: endpoint/office_spawning_control.yml
+  pass_condition: '| stats count | where count > 0'
+  earliest_time: '-24h'
+  latest_time: 'now'
+  attack_data:
+  - file_name: windows-sysmon_control.log
+    data: https://media.githubusercontent.com/media/splunk/attack_data/master/datasets/attack_techniques/T1566.001/macro/windows-sysmon_control.log
+    source:  XmlWinEventLog:Microsoft-Windows-Sysmon/Operational
+    sourcetype: xmlwineventlog