From 239384497f5eac52dce03e157efeacf4accca102 Mon Sep 17 00:00:00 2001
From: Jonhnathan <jonhnathancesar@gmail.com>
Date: Tue, 26 Oct 2021 12:09:16 -0300
Subject: [PATCH] [New Rule] PowerShell MiniDump Script (#1528)

* PowerShell MiniDump Script Initial Rule

* Update credential_access_posh_minidump.toml

* Apply suggestions from code review

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

* Update credential_access_posh_minidump.toml

* Update rules/windows/credential_access_posh_minidump.toml

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

Co-authored-by: Justin Ibarra <brokensound77@users.noreply.github.com>
---
 .../credential_access_posh_minidump.toml      | 70 +++++++++++++++++++
 1 file changed, 70 insertions(+)
 create mode 100644 rules/windows/credential_access_posh_minidump.toml

diff --git a/rules/windows/credential_access_posh_minidump.toml b/rules/windows/credential_access_posh_minidump.toml
new file mode 100644
index 000000000..6d237ea2e
--- /dev/null
+++ b/rules/windows/credential_access_posh_minidump.toml
@@ -0,0 +1,70 @@
+[metadata]
+creation_date = "2021/10/05"
+maturity = "production"
+updated_date = "2021/10/05"
+
+[rule]
+author = ["Elastic"]
+description = """
+This rule detects PowerShell scripts that have capabilities to dump process memory using WindowsErrorReporting or
+Dbghelp.dll MiniDumpWriteDump. Attackers can use this tooling to dump LSASS and get access to credentials.
+"""
+false_positives = ["Powershell Scripts that use this capability for troubleshooting."]
+from = "now-9m"
+index = ["winlogbeat-*", "logs-windows.*"]
+language = "kuery"
+license = "Elastic License v2"
+name = "PowerShell MiniDump Script"
+references = [
+    "https://github.com/PowerShellMafia/PowerSploit/blob/master/Exfiltration/Out-Minidump.ps1",
+    "https://github.com/FuzzySecurity/PowerShell-Suite/blob/master/Get-ProcessMiniDump.ps1"
+]
+risk_score = 73
+rule_id = "577ec21e-56fe-4065-91d8-45eb8224fe77"
+severity = "high"
+tags = ["Elastic", "Host", "Windows", "Threat Detection", "Credential Access"]
+timestamp_override = "event.ingested"
+type = "query"
+
+query = '''
+event.code:"4104" and powershell.file.script_block_text:(MiniDumpWriteDump or MiniDumpWithFullMemory or pmuDetirWpmuDiniM)
+'''
+
+
+[[rule.threat]]
+framework = "MITRE ATT&CK"
+
+[[rule.threat.technique]]
+reference = "https://attack.mitre.org/techniques/T1003/"
+id = "T1003"
+name = "OS Credential Dumping"
+
+    [[rule.threat.technique.subtechnique]]
+    reference = "https://attack.mitre.org/techniques/T1003/001/"
+    id = "T1003.001"
+    name = "LSASS Memory"
+
+
+[rule.threat.tactic]
+reference = "https://attack.mitre.org/tactics/TA0006/"
+id = "TA0006"
+name = "Credential Access"
+
+[[rule.threat]]
+framework = "MITRE ATT&CK"
+
+[[rule.threat.technique]]
+id = "T1059"
+name = "Command and Scripting Interpreter"
+reference = "https://attack.mitre.org/techniques/T1059/"
+
+    [[rule.threat.technique.subtechnique]]
+    id = "T1059.001"
+    name = "PowerShell"
+    reference = "https://attack.mitre.org/techniques/T1059/001/"
+
+
+[rule.threat.tactic]
+id = "TA0002"
+name = "Execution"
+reference = "https://attack.mitre.org/tactics/TA0002/"