Update lnx_crontab_file_modification.yml

rules/linux/builtin/lnx_crontab_file_modification.yml

@@ -1,22 +1,22 @@
-title: Modifying Crontab With File
+title: Modifying Crontab
 id: af202fd3-7bff-4212-a25a-fb34606cfcbe
 status: experimental
-description: Detects suspicious replacement of crontab file with potentially malicious file.
-# log example: Apr 16 11:18:18 localhost CROND[3333]: (pawel) REPLACE (pawel)
+description: Detects suspicious modification of crontab file.
+# log example: Apr 16 11:18:18 localhost CROND[3333]: (user) REPLACE (user)
 author: Pawel Mazur
 references:
-  - https://github.com/redcanaryco/atomic-red-team/blob/master/atomics/T1053.003/T1053.003.md
+    - https://github.com/redcanaryco/atomic-red-team/blob/master/atomics/T1053.003/T1053.003.md
 date: 2022/04/16
 logsource:
-  product: linux
-  service: cron
+    product: linux
+    service: cron
 detection:
-  selection:
-    keyword: 'REPLACE'
-  condition: selection
+    keyword: 
+        - 'REPLACE'
+    condition: keyword
 falsepositives:
-  - Legitimate modification of crontab
+   - Legitimate modification of crontab
 level: medium
 tags:
-  - attack.persistence
-  - attack.t1053.003
+   - attack.persistence
+   - attack.t1053.003