Create persistence_time_provider_mod.toml (#890)

rules/windows/persistence_time_provider_mod.toml

@@ -0,0 +1,51 @@
+[metadata]
+creation_date = "2021/01/19"
+maturity = "production"
+updated_date = "2021/01/19"
+
+[rule]
+author = ["Elastic"]
+description = """
+Windows operating systems are utilizing the time provider architecture in order to obtain accurate time stamps from
+other network devices or clients in the network. Time providers are implemented in the form of a DLL file which resides
+in System32 folder. The service W32Time initiates during the startup of Windows and loads w32time.dll. Adversaries may
+abuse this architecture to establish persistence, specifically by registering and enabling a malicious DLL as a time
+provider.
+"""
+from = "now-9m"
+index = ["winlogbeat-*", "logs-endpoint.events.*"]
+language = "eql"
+license = "Elastic License"
+name = "Potential Persistence via Time Provider Modification"
+references = ["https://pentestlab.blog/2019/10/22/persistence-time-providers/"]
+risk_score = 47
+rule_id = "14ed1aa9-ebfd-4cf9-a463-0ac59ec55204"
+severity = "medium"
+tags = ["Elastic", "Host", "Windows", "Threat Detection", "Persistence"]
+type = "eql"
+
+query = '''
+registry where event.type:"change" and
+  registry.path:"HKLM\\SYSTEM\\*ControlSet*\\Services\\W32Time\\TimeProviders\\*" and
+  registry.data.strings:"*.dll"
+'''
+
+
+[[rule.threat]]
+framework = "MITRE ATT&CK"
+[[rule.threat.technique]]
+id = "T1547"
+name = "Boot or Logon Autostart Execution"
+reference = "https://attack.mitre.org/techniques/T1547/"
+[[rule.threat.technique.subtechnique]]
+id = "T1547.003"
+name = "Time Providers"
+reference = "https://attack.mitre.org/techniques/T1547/003/"
+
+
+
+[rule.threat.tactic]
+id = "TA0003"
+name = "Persistence"
+reference = "https://attack.mitre.org/tactics/TA0003/"
+