[Tuning] Top Noisy Rules (#5449)

* [Tuning] Windows BruteForce Rules Tuning

#1 Multiple Logon Failure from the same Source Address: converted to ES|QL and raised the threshold to 100 failed auths, alert quality should be better since it aggregates all failed auths info into one alert vs multiple EQL matches. (expected reduction more than 50%)

#2 Privileged Account Brute Force - coverted to ESQL and set the threshold to 50 in a minute. this should drop noise volume by more than 50%.

* ++

* Update execution_shell_evasion_linux_binary.toml

* Update execution_shell_evasion_linux_binary.toml

* Update defense_evasion_indirect_exec_forfiles.toml

* Update lateral_movement_remote_file_copy_hidden_share.toml

* Update lateral_movement_remote_file_copy_hidden_share.toml

* Update persistence_service_windows_service_winlog.toml

* Update credential_access_lsass_openprocess_api.toml

* Update persistence_suspicious_scheduled_task_runtime.toml

* Update impact_hosts_file_modified.toml

* Update defense_evasion_process_termination_followed_by_deletion.toml

* Update rules/windows/credential_access_lsass_openprocess_api.toml

* Update rules/windows/credential_access_bruteforce_admin_account.toml

Co-authored-by: Ruben Groenewoud <78494512+Aegrah@users.noreply.github.com>

* Update rules/windows/credential_access_lsass_openprocess_api.toml

Co-authored-by: Ruben Groenewoud <78494512+Aegrah@users.noreply.github.com>

* Update rules/windows/credential_access_bruteforce_multiple_logon_failure_same_srcip.toml

Co-authored-by: Ruben Groenewoud <78494512+Aegrah@users.noreply.github.com>

* Update credential_access_lsass_openprocess_api.toml

* Update impact_hosts_file_modified.toml

* Update credential_access_dollar_account_relay.toml

* Update credential_access_new_terms_secretsmanager_getsecretvalue.toml

---------

Co-authored-by: Ruben Groenewoud <78494512+Aegrah@users.noreply.github.com>

rules/linux/execution_shell_evasion_linux_binary.toml

@@ -2,7 +2,7 @@
 creation_date = "2022/05/06"
 integration = ["endpoint"]
 maturity = "production"
-updated_date = "2025/02/04"
+updated_date = "2025/12/11"
 
 [rule]
 author = ["Elastic"]
@@ -139,20 +139,18 @@ timestamp_override = "event.ingested"
 type = "eql"
 
 query = '''
-process where host.os.type == "linux" and event.type == "start" and
+process where host.os.type == "linux" and event.type == "start" and process.executable != null and
 (
   /* launching shell from capsh */
-  (process.name == "capsh" and process.args == "--") or
+  (process.name == "capsh" and process.args == "--" and not process.parent.executable == "/usr/bin/log4j-cve-2021-44228-hotpatch") or
 
   /* launching shells from unusual parents or parent+arg combos */
   (process.name in ("bash", "dash", "ash", "sh", "tcsh", "csh", "zsh", "ksh", "fish") and (
     (process.parent.name : "*awk" and process.parent.args : "BEGIN {system(*)}") or
-    (process.parent.name == "git" and process.parent.args : ("*PAGER*", "!*sh", "exec *sh") or
-     process.args : ("*PAGER*", "!*sh", "exec *sh") and not process.name == "ssh" ) or
+    (process.parent.name == "git" and process.parent.args : ("!*sh", "exec *sh") and not process.name == "ssh" ) or
     (process.parent.name : ("byebug", "ftp", "strace", "zip", "tar") and
     (
       process.parent.args : "BEGIN {system(*)}" or
-      (process.parent.args : ("*PAGER*", "!*sh", "exec *sh") or process.args : ("*PAGER*", "!*sh", "exec *sh")) or
       (
         (process.parent.args : "exec=*sh" or (process.parent.args : "-I" and process.parent.args : "*sh")) or
         (process.args : "exec=*sh" or (process.args : "-I" and process.args : "*sh"))
@@ -182,7 +180,8 @@ process where host.os.type == "linux" and event.type == "start" and
   )) or
   (process.name == "busybox" and event.action == "exec" and process.args_count == 2 and process.args : "*sh" and not
    process.executable : "/var/lib/docker/overlay2/*/merged/bin/busybox" and not (process.parent.args == "init" and
-   process.parent.args == "runc") and not process.parent.args in ("ls-remote", "push", "fetch") and not process.parent.name == "mkinitramfs") or
+   process.parent.args == "runc") and not process.parent.args in ("ls-remote", "push", "fetch") and not process.parent.name == "mkinitramfs" and
+   not process.parent.executable == "/bin/busybox") or
   (process.name == "env" and process.args_count == 2 and process.args : "*sh") or
   (process.parent.name in ("vi", "vim") and process.parent.args == "-c" and process.parent.args : ":!*sh") or
   (process.parent.name in ("c89", "c99", "gcc") and process.parent.args : "*sh,-s" and process.parent.args == "-wrapper") or