[New Rule] Suspicious WerFault Child Process (#212)

* [New Rule] Suspicious WerFault Child Process * Update defense_evasion_masquerading_suspicious_werfault_childproc.toml * Update defense_evasion_masquerading_suspicious_werfault_childproc.toml * Update defense_evasion_masquerading_suspicious_werfault_childproc.toml * Update defense_evasion_masquerading_suspicious_werfault_childproc.toml * Update defense_evasion_masquerading_suspicious_werfault_childproc.toml * Update rules/windows/defense_evasion_masquerading_suspicious_werfault_childproc.toml Co-authored-by: Justin Ibarra <brokensound77@users.noreply.github.com> * Update rules/windows/defense_evasion_masquerading_suspicious_werfault_childproc.toml Co-authored-by: Justin Ibarra <brokensound77@users.noreply.github.com> * Update rules/windows/defense_evasion_masquerading_suspicious_werfault_childproc.toml Co-authored-by: Justin Ibarra <brokensound77@users.noreply.github.com> * Update defense_evasion_masquerading_suspicious_werfault_childproc.toml * linted * Update defense_evasion_masquerading_suspicious_werfault_childproc.toml * Update rules/windows/defense_evasion_masquerading_suspicious_werfault_childproc.toml Co-authored-by: Justin Ibarra <brokensound77@users.noreply.github.com> * Update rules/windows/defense_evasion_masquerading_suspicious_werfault_childproc.toml Co-authored-by: Justin Ibarra <brokensound77@users.noreply.github.com> Co-authored-by: Justin Ibarra <brokensound77@users.noreply.github.com>
2020-09-22 14:32:04 +02:00
parent 96992b3ae6
commit 42247efc3b
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+[metadata]
+creation_date = "2020/08/24"
+ecs_version = ["1.6.0"]
+maturity = "production"
+updated_date = "2020/08/24"
+
+[rule]
+author = ["Elastic"]
+description = """
+A suspicious WerFault child process was detected, which may indicate an attempt to run unnoticed. Verify process details
+such as command line, network connections, file writes and parent process details as well.
+"""
+false_positives = ["Custom Windows Error Reporting Debugger"]
+index = ["winlogbeat-*", "logs-endpoint.events.*"]
+language = "kuery"
+license = "Elastic License"
+name = "Suspicious WerFault Child Process"
+references = [
+    "https://www.hexacorn.com/blog/2019/09/19/silentprocessexit-quick-look-under-the-hood/",
+    "https://github.com/sbousseaden/EVTX-ATTACK-SAMPLES/blob/master/Persistence/persistence_SilentProcessExit_ImageHijack_sysmon_13_1.evtx",
+]
+risk_score = 47
+rule_id = "ac5012b8-8da8-440b-aaaf-aedafdea2dff"
+severity = "medium"
+tags = ["Elastic", "Windows"]
+type = "query"
+
+query = '''
+event.category:process and event.type:(start or process_started) and
+ process.parent.name:WerFault.exe and
+ not process.name:(cofire.exe or psr.exe or VsJITDebugger.exe or TTTracer.exe or rundll32.exe)
+'''
+
+
+[[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/"