Update "Short Lived Scheduled Task"

detections/endpoint/short_lived_scheduled_task.yml

@@ -1,26 +1,34 @@
 name: Short Lived Scheduled Task
 id: 6fa31414-546e-11ec-adfa-acde48001122
-version: 11
+version: 12
 creation_date: '2021-12-03'
-modification_date: '2026-05-13'
+modification_date: '2026-07-07'
 author: Mauricio Velazco, Splunk
 status: production
-type: TTP
-description: The following analytic detects the creation and deletion of scheduled tasks within a short time frame (less than 30 seconds) using Windows Security EventCodes 4698 and 4699. This behavior is identified by analyzing Windows Security Event Logs and leveraging the Windows TA for parsing. Such activity is significant as it may indicate lateral movement or remote code execution attempts by adversaries. If confirmed malicious, this could lead to unauthorized access, data exfiltration, or execution of malicious payloads, necessitating prompt investigation and response by security analysts.
+type: Anomaly
+description: |-
+    The following analytic detects the creation and deletion of scheduled tasks within a short time frame (less than 30 seconds) using Windows Security EventCodes 4698 and 4699.
+    This behavior is identified by analyzing Windows Security Event Logs and leveraging the Windows TA for parsing.
+    Such activity may indicate lateral movement or remote code execution attempts by adversaries.
+    If confirmed malicious, this could lead to unauthorized access, data exfiltration, or execution of malicious payloads, necessitating prompt investigation and response by security analysts.
 data_source:
     - Windows Event Log Security 4698
     - Windows Event Log Security 4699
 search: |-
-    `wineventlog_security` EventCode=4698 OR EventCode=4699
-      | xmlkv Message
-      | transaction Task_Name  startswith=(EventCode=4698) endswith=(EventCode=4699)
-      | eval short_lived=case((duration<30),"TRUE")
-      | search  short_lived = TRUE
-      | rename ComputerName as dest
-      | table _time, dest, Account_Name, Command, Task_Name, short_lived
-      | `short_lived_scheduled_task_filter`
-how_to_implement: To successfully implement this search, you need to be ingesting Windows Security Event Logs with 4698 EventCode enabled. The Windows TA is also required.
-known_false_positives: Although uncommon, legitimate applications may create and delete a Scheduled Task within 30 seconds. Filter as needed.
+    `wineventlog_security`
+    EventCode IN (4698, 4699)
+    | xmlkv object_attrs
+    | transaction TaskName dest startswith=(EventCode=4698) endswith=(EventCode=4699) maxspan=30s
+    | stats count min(_time) AS firstTime
+                  max(_time) AS lastTime
+        by Command TaskName user dest RunLevel
+    | `security_content_ctime(firstTime)`
+    | `security_content_ctime(lastTime)`
+    | `short_lived_scheduled_task_filter`
+how_to_implement: |-
+    To successfully implement this search, you need to be ingesting Windows Security Event Logs with 4698 EventCode enabled. The Windows TA is also required.
+known_false_positives: |-
+    Although uncommon, legitimate applications may create and delete a Scheduled Task within 30 seconds. Filter as needed.
 references:
     - https://attack.mitre.org/techniques/T1053/005/
     - https://docs.microsoft.com/en-us/windows/win32/taskschd/about-the-task-scheduler
@@ -33,12 +41,12 @@ drilldown_searches:
       search: '| from datamodel Risk.All_Risk | search normalized_risk_object IN ("$dest$") | 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: 7d
       latest_offset: "0"
-finding:
-    title: A windows scheduled task was created and deleted in 30 seconds on $dest$
-    entity:
-        field: dest
-        type: system
-        score: 50
+intermediate_findings:
+    entities:
+        - field: dest
+          type: system
+          score: 20
+          message: A windows scheduled task [$TaskName$] with the command [$Command$] was created by [$user$] and deleted in less than 30 seconds on [$dest$]
 analytic_story:
     - Active Directory Lateral Movement
     - CISA AA22-257A
@@ -57,7 +65,7 @@ security_domain: endpoint
 tests:
     - name: True Positive Test
       attack_data:
-        - data: https://media.githubusercontent.com/media/splunk/attack_data/master/datasets/attack_techniques/T1053.005/lateral_movement/windows-security.log
-          source: WinEventLog:Security
-          sourcetype: WinEventLog
+        - data: https://media.githubusercontent.com/media/splunk/attack_data/master/datasets/attack_techniques/T1053.005/lateral_movement/windows-security-task.log
+          source: XmlWinEventLog:Security
+          sourcetype: XmlWinEventLog
       test_type: unit