Remove 7.15+ rules from 7.14 branch (#1613)

* Remove 7.15+ rules from 7.14 branch

rules/cross-platform/defense_evasion_agent_spoofing_mismatched_id.toml

@@ -1,49 +0,0 @@
-[metadata]
-creation_date = "2021/07/14"
-maturity = "production"
-updated_date = "2021/07/14"
-min_stack_comments = "The field `event.agent_id_status` was not introduced until 7.14"
-min_stack_version = "7.14.0"
-
-[rule]
-author = ["Elastic"]
-description = """Detects events which have a mismatch on the expected event agent ID. The status "agent_id_mismatch"
-occurs when the expected agent ID associated with the API key does not match the actual agent ID in an event. This could
-indicate attempts to spoof events in order to masquerade actual activity to evade detection.
-"""
-false_positives = [
-    """
-    This is meant to run only on datasources using agents v7.14+ since versions prior to that will be missing the
-    necessary field, resulting in false positives.
-    """,
-]
-from = "now-9m"
-index = ["logs-*", "metrics-*", "traces-*"]
-language = "kuery"
-license = "Elastic License v2"
-name = "Agent Spoofing - Mismatched Agent ID"
-risk_score = 73
-rule_id = "3115bd2c-0baa-4df0-80ea-45e474b5ef93"
-severity = "high"
-tags = ["Elastic", "Threat Detection", "Defense Evasion"]
-timestamp_override = "event.ingested"
-type = "query"
-
-query = '''
-event.agent_id_status:agent_id_mismatch
-'''
-
-
-[[rule.threat]]
-framework = "MITRE ATT&CK"
-[[rule.threat.technique]]
-id = "T1036"
-name = "Masquerading"
-reference = "https://attack.mitre.org/techniques/T1036/"
-
-
-[rule.threat.tactic]
-id = "TA0005"
-name = "Defense Evasion"
-reference = "https://attack.mitre.org/tactics/TA0005/"
-

rules/cross-platform/defense_evasion_agent_spoofing_multiple_hosts.toml

@@ -1,57 +0,0 @@
-[metadata]
-creation_date = "2021/07/14"
-maturity = "production"
-updated_date = "2021/07/14"
-min_stack_comments = "The field `event.agent_id_status` was not introduced until 7.14"
-min_stack_version = "7.14.0"
-
-[rule]
-author = ["Elastic"]
-description = """Detects when multiple hosts are using the same agent ID. This could occur in the event of an agent
-being taken over and used to inject illegitimate documents into an instance as an attempt to spoof events in order to
-masquerade actual activity to evade detection.
-"""
-false_positives = [
-    """
-    This is meant to run only on datasources using agents v7.14+ since versions prior to that will be missing the
-    necessary field, resulting in false positives.
-    """,
-]
-from = "now-9m"
-index = ["logs-*", "metrics-*", "traces-*"]
-language = "kuery"
-license = "Elastic License v2"
-name = "Agent Spoofing - Multiple Hosts Using Same Agent"
-risk_score = 73
-rule_id = "493834ca-f861-414c-8602-150d5505b777"
-severity = "high"
-tags = ["Elastic", "Threat Detection", "Defense Evasion"]
-timestamp_override = "event.ingested"
-type = "threshold"
-
-query = '''
-event.agent_id_status:*
-'''
-
-
-[[rule.threat]]
-framework = "MITRE ATT&CK"
-[[rule.threat.technique]]
-id = "T1036"
-name = "Masquerading"
-reference = "https://attack.mitre.org/techniques/T1036/"
-
-
-[rule.threat.tactic]
-id = "TA0005"
-name = "Defense Evasion"
-reference = "https://attack.mitre.org/tactics/TA0005/"
-
-
-[rule.threshold]
-field = ["agent.id"]
-value = 2
-
-[[rule.threshold.cardinality]]
-field = "host.id"
-value = 2