[New Rule] Chkconfig Service Add (#2159)

* [New Rule] Chkconfig Service Add

* Update rules/linux/persistence_chkconfig_service_add.toml

rules/linux/persistence_chkconfig_service_add.toml

@@ -0,0 +1,48 @@
+[metadata]
+creation_date = "2022/07/22"
+maturity = "production"
+updated_date = "2022/07/22"
+
+[rule]
+author = ["Elastic"]
+description = """
+Detects the use of the chkconfig binary to manually add a service for management by chkconfig. Threat actors may utilize this technique to maintain persistence on a system. When a new service is added, chkconfig ensures that the service has either a start or a kill entry in every runlevel and when the system is rebooted the service file added will run providing long-term persistence.
+"""
+from = "now-9m"
+index = ["logs-*"]
+language = "eql"
+license = "Elastic License v2"
+name = "Chkconfig Service Add"
+references = [
+    "https://www.intezer.com/blog/research/lightning-framework-new-linux-threat/"
+]
+risk_score = 74
+rule_id = "b910f25a-2d44-47f2-a873-aabdc0d355e6"
+severity = "medium"
+tags = ["Elastic", "Host", "Linux", "Threat Detection", "Persistence", "Lightning Framework"]
+timestamp_override = "event.ingested"
+type = "eql"
+
+query = '''
+process where event.type == "start" and 
+   (process.executable : "/usr/sbin/chkconfig" and process.args : "--add") or 
+   (process.args : "*chkconfig" and process.args : "--add")
+'''
+
+[[rule.threat]]
+framework = "MITRE ATT&CK"
+[[rule.threat.technique]]
+id = "T1037"
+name = "Boot or Logon Initialization Scripts"
+reference = "https://attack.mitre.org/techniques/T1037/"
+
+[[rule.threat.technique.subtechnique]]
+id = "T1037.004"
+name = "RC Scripts"
+reference = "https://attack.mitre.org/techniques/T1037/004/"
+
+[rule.threat.tactic]
+id = "TA0003"
+name = "Persistence"
+reference = "https://attack.mitre.org/tactics/TA0003/"
+