Merge branch 'T1059' of https://github.com/splunk/security_content into T1059

detections/endpoint/windows_dism_remove_defender.yml

@@ -6,23 +6,30 @@ author: Michael Haag, Splunk
 type: TTP
 datamodel:
 - Endpoint
-description: The following analytic identifies the use of the Windows Disk Image Utility, `dism.exe`, to remove Windows Defender. Adversaries may use `dism.exe` to disable Defender before completing their objective. 
+description: The following analytic identifies the use of the Windows Disk Image Utility,
+  `dism.exe`, to remove Windows Defender. Adversaries may use `dism.exe` to disable
+  Defender before completing their objective.
 search: '| tstats `security_content_summariesonly` count min(_time) as firstTime max(_time)
   as lastTime from datamodel=Endpoint.Processes where Processes.process_name=dism.exe
-  (Processes.process="*/online*" AND Processes.process="*/disable-feature*" AND Processes.process="*Windows-Defender*" AND Processes.process="*/remove*") 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_dism_remove_defender_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: Some legitimate administrative tools leverage `dism.exe` to manipulate packages and features of the operating system. Filter as needed.
+  (Processes.process="*/online*" AND Processes.process="*/disable-feature*" AND Processes.process="*Windows-Defender*"
+  AND Processes.process="*/remove*") 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_dism_remove_defender_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: Some legitimate administrative tools leverage `dism.exe` to
+  manipulate packages and features of the operating system. Filter as needed.
 references:
-  - https://thedfirreport.com/2020/11/23/pysa-mespinoza-ransomware/  
+- https://thedfirreport.com/2020/11/23/pysa-mespinoza-ransomware/
 tags:
   analytic_story:
   - Windows Defense Evasion Tactics
-  dataset: []
+  dataset:
+  - https://media.githubusercontent.com/media/splunk/attack_data/master/datasets/attack_techniques/T1562.001/atomic_red_team/windows-sysmon_dism.log
   kill_chain_phases:
   - Exploitation
   mitre_attack_id:
@@ -36,11 +43,11 @@ tags:
   - _time
   - Processes.dest
   - Processes.user
-  - Processes.parent_process_name #parent process name
-  - Processes.parent_process #parent cmdline
+  - Processes.parent_process_name
+  - Processes.parent_process
   - Processes.original_file_name
-  - Processes.process_name #process name
-  - Processes.process #process cmdline
+  - Processes.process_name
+  - Processes.process
   - Processes.process_id
   - Processes.parent_process_path
   - Processes.process_path
@@ -48,12 +55,12 @@ tags:
   security_domain: access
   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 $dest$ by user $user$ attempting to disable Windows Defender.
+  message: An instance of $parent_process_name$ spawning $process_name$ was identified
+    on endpoint $dest$ by user $user$ attempting to disable Windows Defender.
   observable:
   - name: user
     type: User
@@ -71,4 +78,4 @@ tags:
     type: Process
     role:
     - Child Process
-  
+  automated_detection_testing: passed