[New Rule] Process Termination Followed by Deletion (#482)

* [New Rule] Process Termination Followed by Deletion * excluded SoftwareDistrib and WinSxS Folders * added drive letter for better performance * excluded signed PE * eql syntax * ecs_version * Update rules/windows/defense_evasion_process_termination_followed_by_deletion.toml Co-authored-by: Brent Murphy <56412096+bm11100@users.noreply.github.com> * Update rules/windows/defense_evasion_process_termination_followed_by_deletion.toml Co-authored-by: Brent Murphy <56412096+bm11100@users.noreply.github.com> * Update rules/windows/defense_evasion_process_termination_followed_by_deletion.toml Co-authored-by: David French <56409778+threat-punter@users.noreply.github.com> * Update rules/windows/defense_evasion_process_termination_followed_by_deletion.toml Co-authored-by: David French <56409778+threat-punter@users.noreply.github.com> * added few more extension as suggested by DanStep * dropped winlogbeat due to pe.codesign Co-authored-by: Brent Murphy <56412096+bm11100@users.noreply.github.com> Co-authored-by: David French <56409778+threat-punter@users.noreply.github.com> Co-authored-by: Justin Ibarra <brokensound77@users.noreply.github.com>
2020-12-08 22:26:11 +01:00
parent 97fa6c62cd
commit 538aa80bba
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+[metadata]
+creation_date = "2020/11/04"
+maturity = "production"
+updated_date = "2020/11/04"
+
+[rule]
+author = ["Elastic"]
+description = """
+Identifies a process termination event quickly followed by the deletion of its executable file. Malware tools and other non-native
+files dropped or created on a system by an adversary may leave traces to indicate to what occurred. Removal of these files can occur during an intrusion, or as part of a post-intrusion process to minimize the
+adversary's footprint.
+"""
+from = "now-9m"
+index = ["logs-endpoint.events.*"]
+language = "eql"
+license = "Elastic License"
+name = "Process Termination followed by Deletion"
+risk_score = 47
+rule_id = "09443c92-46b3-45a4-8f25-383b028b258d"
+severity = "medium"
+tags = ["Elastic", "Host", "Windows", "Threat Detection", "Defense Evasion"]
+type = "eql"
+
+query = '''
+sequence by host.id with maxspan=5s
+   [process where event.type == "end" and 
+    process.code_signature.trusted == false and
+    not process.executable : ("C:\\Windows\\SoftwareDistribution\\*.exe", "C:\\Windows\\WinSxS\\*.exe")
+   ] by process.executable
+   [file where event.type == "deletion" and file.extension : ("exe", "scr", "com")] by file.path
+'''
+
+
+[[rule.threat]]
+framework = "MITRE ATT&CK"
+[[rule.threat.technique]]
+id = "T1070"
+name = "Indicator Removal on Host"
+reference = "https://attack.mitre.org/techniques/T1070/"
+
+
+[rule.threat.tactic]
+id = "TA0005"
+name = "Defense Evasion"
+reference = "https://attack.mitre.org/tactics/TA0005/"