From 85f05f928bb23dd1435cb76cc70ad2b54074a6d2 Mon Sep 17 00:00:00 2001
From: Jonhnathan <jonhnathancesar@gmail.com>
Date: Fri, 4 Feb 2022 15:44:27 -0300
Subject: [PATCH] [New Rule] PowerShell Script Block Logging Disabled (#1749)

* PowerShell Script Block Logging Disabled

* Update rules/windows/defense_evasion_disable_posh_scriptblocklogging.toml

Co-authored-by: Samirbous <64742097+Samirbous@users.noreply.github.com>

* Update defense_evasion_disable_posh_scriptblocklogging.toml

* Apply suggestions from code review

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

Co-authored-by: Samirbous <64742097+Samirbous@users.noreply.github.com>
Co-authored-by: Justin Ibarra <brokensound77@users.noreply.github.com>

(cherry picked from commit 7dac52f1cff03f4a84873c74a473ce29b9e3b7d5)
---
 ...asion_disable_posh_scriptblocklogging.toml | 53 +++++++++++++++++++
 1 file changed, 53 insertions(+)
 create mode 100644 rules/windows/defense_evasion_disable_posh_scriptblocklogging.toml

diff --git a/rules/windows/defense_evasion_disable_posh_scriptblocklogging.toml b/rules/windows/defense_evasion_disable_posh_scriptblocklogging.toml
new file mode 100644
index 000000000..23d6c7492
--- /dev/null
+++ b/rules/windows/defense_evasion_disable_posh_scriptblocklogging.toml
@@ -0,0 +1,53 @@
+[metadata]
+creation_date = "2022/01/31"
+maturity = "production"
+updated_date = "2022/01/31"
+
+[rule]
+author = ["Elastic"]
+description = """
+Identifies attempts to disable PowerShell Script Block Logging via registry modification. Attackers may disable
+this logging to conceal their activities in the host and evade detection.
+"""
+from = "now-9m"
+index = ["winlogbeat-*", "logs-endpoint.events.*", "logs-windows.*"]
+language = "eql"
+license = "Elastic License v2"
+name = "PowerShell Script Block Logging Disabled"
+references = [
+    "https://admx.help/?Category=Windows_10_2016&Policy=Microsoft.Policies.PowerShell::EnableScriptBlockLogging",
+]
+risk_score = 47
+rule_id = "818e23e6-2094-4f0e-8c01-22d30f3506c6"
+severity = "medium"
+tags = ["Elastic", "Host", "Windows", "Threat Detection", "Defense Evasion"]
+timestamp_override = "event.ingested"
+type = "eql"
+
+query = '''
+registry where event.type == "change" and
+    registry.path : 
+        "HKLM\\SOFTWARE\\Policies\\Microsoft\\Windows\\PowerShell\\ScriptBlockLogging\\EnableScriptBlockLogging"
+    and registry.data.strings : ("0", "0x00000000")
+'''
+
+
+[[rule.threat]]
+framework = "MITRE ATT&CK"
+
+[[rule.threat.technique]]
+id = "T1562"
+reference = "https://attack.mitre.org/techniques/T1562/"
+name = "Impair Defenses"
+
+  [[rule.threat.technique.subtechnique]]
+  id = "T1562.002"
+  name = "Disable Windows Event Logging"
+  reference = "https://attack.mitre.org/techniques/T1562/002/"
+
+
+[rule.threat.tactic]
+id = "TA0005"
+reference = "https://attack.mitre.org/tactics/TA0005/"
+name = "Defense Evasion"
+