Update persistence_webshell_detection.toml (#5524)

Co-authored-by: Jonhnathan <26856693+w0rk3r@users.noreply.github.com>

rules/windows/persistence_webshell_detection.toml

@@ -2,7 +2,7 @@
 creation_date = "2021/08/24"
 integration = ["endpoint", "windows", "system", "sentinel_one_cloud_funnel", "m365_defender", "crowdstrike"]
 maturity = "production"
-updated_date = "2025/12/16"
+updated_date = "2026/01/02"
 
 [rule]
 author = ["Elastic"]
@@ -99,7 +99,7 @@ type = "new_terms"
 
 query = '''
 host.os.type:windows and event.category:process and event.type:start and process.args : * and
-  process.parent.name:("w3wp.exe" or "httpd.exe" or "nginx.exe" or "php.exe" or "php-cgi.exe" or "tomcat.exe") and
+  process.parent.name:("w3wp.exe" or "httpd.exe" or "nginx.exe" or "php.exe" or "php-cgi.exe" or "tomcat.exe" or "ArcSOC.exe") and
   (
     process.name : ("cmd.exe" or "cscript.exe" or "powershell.exe" or "pwsh.exe" or "powershell_ise.exe" or "wmic.exe" or "wscript.exe") or
     process.name.caseless : ("cmd.exe" or "cscript.exe" or "powershell.exe" or "pwsh.exe" or "powershell_ise.exe" or "wmic.exe" or "wscript.exe")