[New Rule] Creation of a Hidden Local User Account (#738)

* [New Rule] Hidden User Local Account Creation

* renamed rule

Co-authored-by: Justin Ibarra <brokensound77@users.noreply.github.com>

rules/windows/persistence_evasion_hidden_local_account_creation.toml

@@ -0,0 +1,45 @@
+[metadata]
+creation_date = "2020/12/18"
+maturity = "production"
+updated_date = "2020/12/18"
+
+[rule]
+author = ["Elastic"]
+description = """
+Identifies the creation of a hidden local user account by appending the dollar sign to the account name. This is
+sometimes done by attackers to increase access to a system and avoid appearing in the results of accounts listing using
+the net users command.
+"""
+from = "now-9m"
+index = ["winlogbeat-*", "logs-endpoint.events.*"]
+language = "eql"
+license = "Elastic License"
+name = "Creation of a Hidden Local User Account"
+references = [
+    "https://blog.menasec.net/2019/02/threat-hunting-6-hiding-in-plain-sights_8.html",
+    "https://github.com/CyberMonitor/APT_CyberCriminal_Campagin_Collections/tree/master/2020/2020.12.15.Lazarus_Campaign",
+]
+risk_score = 73
+rule_id = "2edc8076-291e-41e9-81e4-e3fcbc97ae5e"
+severity = "high"
+tags = ["Elastic", "Host", "Windows", "Threat Detection", "Defense Evasion", "Persistence"]
+type = "eql"
+
+query = '''
+registry where wildcard(registry.path, "HKLM\\SAM\\SAM\\Domains\\Account\\Users\\Names\\*$\\")
+'''
+
+
+[[rule.threat]]
+framework = "MITRE ATT&CK"
+[[rule.threat.technique]]
+id = "T1136"
+name = "Create Account"
+reference = "https://attack.mitre.org/techniques/T1136/"
+
+
+[rule.threat.tactic]
+id = "TA0003"
+name = "Persistence"
+reference = "https://attack.mitre.org/tactics/TA0003/"
+