[Rule Tuning] Linux Rules (#3092)

* [Rule Tuning] [WIP] Linux DR * Update defense_evasion_binary_copied_to_suspicious_directory.toml * Fixed tag * Added additional tuning * unit test fix * Additional tuning * tuning * added max signals * Added max_signals=1 to brute force rules * Cross-Platform Tuning * Small fix * new_terms conversion * typo * new_terms conversion * Ransomware rule tuning * performance tuning * new_terms conversion for auditd_manager * tune * Need coffee * kql/eql stuff * formatting improvement * new_terms sudo hijacking conversion * exclusion * Deprecations that were added last tuning * Deprecations that were added last tuning * Increased max timespan for brute force rules * version bump * added domain tag * Two tunings * More tuning * Additional tuning * updated_date bump * query optimization * Tuning * Readded the exclusions for this one * Changed int comparison * Some tunings * Update persistence_systemd_scheduled_timer_created.toml * Update rules/linux/privilege_escalation_ld_preload_shared_object_modif.toml Co-authored-by: Isai <59296946+imays11@users.noreply.github.com> * [New Rule] Potential curl CVE-2023-38545 Exploitation * Revert "[New Rule] Potential curl CVE-2023-38545 Exploitation" This reverts commit 9c04d1b53d3d63678289f43ec0c7b617d26f1ce0. * Update rules/cross-platform/command_and_control_non_standard_ssh_port.toml * Update rules/linux/command_and_control_cat_network_activity.toml * Update persistence_message_of_the_day_execution.toml * Changed max_signals * Revert "Merge branch 'main' into rule-tuning-ongoing-dr" This reverts commit 1106b5d2eba1a3529eff325226d6baabfd4b0bf3, reversing changes made to 5ff510757f25b0cb32e1ef18e9e2c34c8ec325a8. * Revertable merge * Update defense_evasion_ld_preload_env_variable_process_injection.toml * File name change --------- Co-authored-by: Isai <59296946+imays11@users.noreply.github.com> Co-authored-by: Jonhnathan <26856693+w0rk3r@users.noreply.github.com> (cherry picked from commit 020fff3aea)
2023-10-23 16:28:58 +02:00
parent 8e5464be56
commit 6c36d2afa3
60 changed files with 749 additions and 422 deletions
@@ -49,21 +49,20 @@ For more details on Elastic Defend refer to the [helper guide](https://www.elast

 """
 severity = "medium"
-tags = ["Domain: Endpoint", "OS: Linux", "Use Case: Threat Detection", "Tactic: Impact", "Data Source: Elastic Defend"]
+tags = ["Domain: Endpoint",
+        "OS: Linux",
+        "Use Case: Threat Detection",
+        "Tactic: Impact",
+        "Data Source: Elastic Defend"
+        ]
 type = "eql"
 query = '''
-sequence by host.id, process.entity_id with maxspan=1s
+sequence by process.entity_id, host.id with maxspan=1s
  [file where host.os.type == "linux" and event.type == "change" and event.action == "rename" and file.extension : "?*" 
-   and ((process.name in ("bash", "dash", "sh", "tcsh", "csh", "zsh", "ksh", "fish", "ash", "openssl")) or
-   (process.executable : ("./*", "/tmp/*", "/var/tmp/*", "/dev/shm/*", "/var/run/*", "/boot/*", "/srv/*", "/run/*"))) and
+   and process.executable : ("./*", "/tmp/*", "/var/tmp/*", "/dev/shm/*", "/var/run/*", "/boot/*", "/srv/*", "/run/*") and
   file.path : (
   "/home/*/Downloads/*", "/home/*/Documents/*", "/root/*", "/bin/*", "/usr/bin/*",
-   "/opt/*", "/etc/*", "/var/log/*", "/var/lib/log/*", "/var/backup/*", "/var/www/*") and not ((
-   process.name : (
-   "dpkg", "yum", "dnf", "rpm", "dockerd", "go", "java", "pip*", "python*", "node", "containerd", "php", "p4d",
-   "conda", "chrome", "imap", "cmake", "firefox", "semanage", "semodule", "ansible-galaxy", "fc-cache", "jammy", "git",
-   "systemsettings", "vmis-launcher")) or file.path : "/etc/selinux/*" or (file.extension in ("qmlc", "txt")
-   ))] with runs=25
+   "/opt/*", "/etc/*", "/var/log/*", "/var/lib/log/*", "/var/backup/*", "/var/www/*")] with runs=25
 '''

 [[rule.threat]]