[Rule Tuning] Tuning Process Termination followed by Deletion (#4173)

* adding rule tuning

* adjusted operators; fixed missing quotes

* Update rules/windows/defense_evasion_process_termination_followed_by_deletion.toml

* Update defense_evasion_process_termination_followed_by_deletion.toml

* Update defense_evasion_process_termination_followed_by_deletion.toml

---------

Co-authored-by: Samirbous <[email protected]>
Co-authored-by: Jonhnathan <[email protected]>

(cherry picked from commit 33d832d)

rules/windows/defense_evasion_process_termination_followed_by_deletion.toml

@@ -2,7 +2,7 @@
 creation_date = "2020/11/04"
 integration = ["endpoint"]
 maturity = "production"
-updated_date = "2024/05/21"
+updated_date = "2024/11/04"
 
 [transform]
 [[transform.osquery]]
@@ -39,7 +39,7 @@ of these files can occur during an intrusion, or as part of a post-intrusion pro
 footprint.
 """
 from = "now-9m"
-index = ["logs-endpoint.events.process-*", "logs-endpoint.events.file-*", "endgame-*"]
+index = ["logs-endpoint.events.process-*", "logs-endpoint.events.file-*"]
 language = "eql"
 license = "Elastic License v2"
 name = "Process Termination followed by Deletion"
@@ -109,22 +109,38 @@ query = '''
 sequence by host.id with maxspan=5s
    [process where host.os.type == "windows" and event.type == "end" and
     process.code_signature.trusted != true and
-    not process.executable : ("C:\\Windows\\SoftwareDistribution\\*.exe", "C:\\Windows\\WinSxS\\*.exe")
+    not process.executable like
+             ("C:\\Windows\\SoftwareDistribution\\*.exe",
+              "C:\\Windows\\WinSxS\\*.exe",
+              "?:\\Windows\\Postillion\\Office\\*.exe") and
+    not (
+      process.name : "infinst.exe" and process.parent.name: "dxsetup.exe" and
+      process.parent.code_signature.subject_name == "NVIDIA Corporation" and
+      process.parent.code_signature.status == "trusted"
+    )
    ] by process.executable
-   [file where host.os.type == "windows" and event.type == "deletion" and file.extension : ("exe", "scr", "com") and
-    not process.executable :
+   [file where host.os.type == "windows" and event.type == "deletion" and file.extension in~ ("exe", "scr", "com") and
+    not process.executable like
              ("?:\\Program Files\\*.exe",
               "?:\\Program Files (x86)\\*.exe",
               "?:\\Windows\\System32\\svchost.exe",
-              "?:\\Windows\\System32\\drvinst.exe") and
-    not file.path : (
+              "?:\\Windows\\System32\\drvinst.exe",
+              "?:\\Windows\\Postillion\\Office\\*.exe") and
+    not file.path like (
           "?:\\Program Files\\*.exe",
           "?:\\Program Files (x86)\\*.exe",
           "?:\\Windows\\Temp\\*\\DismHost.exe",
           "?:\\$WINDOWS.~BT\\Work\\*\\DismHost.exe",
           "?:\\$WinREAgent\\Scratch\\*\\DismHost.exe",
           "?:\\Windows\\tenable_mw_scan_*.exe",
-          "?:\\Users\\*\\AppData\\Local\\Temp\\LogiUI\\Pak\\uninstall.exe"
+          "?:\\Users\\*\\AppData\\Local\\Temp\\LogiUI\\Pak\\uninstall.exe",
+          "?:\\ProgramData\\chocolatey\\*.exe"
+    ) and
+    not (process.name : "OktaVerifySetup-*.exe" and process.code_signature.subject_name == "Okta, Inc.") and
+    not (
+      process.executable : "?:\\Windows\\SysWOW64\\config\\systemprofile\\Citrix\\UpdaterBinaries\\CitrixReceiver\\*" and
+      process.code_signature.subject_name == "Citrix Systems, Inc." and
+      file.path : "?:\\Windows\\SysWOW64\\config\\systemprofile\\Citrix\\UpdaterBinaries\\CitrixReceiver\\*\\bootstrapperhelper.exe"
     )
    ] by file.path
 '''