From c3160b9279002e17e2b0f88404feec1e2a68565e Mon Sep 17 00:00:00 2001
From: Jonhnathan <26856693+w0rk3r@users.noreply.github.com>
Date: Fri, 13 Sep 2024 11:51:19 -0300
Subject: [PATCH] [New Rule] PowerShell Script with Windows Defender Tampering
 Capabilities (#4075)

* [New Rule] PowerShell Script with Windows Defender Tampering Capabilities

* .
---
 ...fense_evasion_posh_defender_tampering.toml | 97 +++++++++++++++++++
 1 file changed, 97 insertions(+)
 create mode 100644 rules_building_block/defense_evasion_posh_defender_tampering.toml

diff --git a/rules_building_block/defense_evasion_posh_defender_tampering.toml b/rules_building_block/defense_evasion_posh_defender_tampering.toml
new file mode 100644
index 000000000..2d4726976
--- /dev/null
+++ b/rules_building_block/defense_evasion_posh_defender_tampering.toml
@@ -0,0 +1,97 @@
+[metadata]
+bypass_bbr_timing = true
+creation_date = "2024/09/11"
+integration = ["windows"]
+maturity = "production"
+updated_date = "2024/09/11"
+
+
+[rule]
+author = ["Elastic"]
+description = """
+Identifies PowerShell scripts containing cmdlets and parameters that attackers can abuse to disable Windows Defender
+features. Attackers can tamper with antivirus to reduce the risk of detection when executing their payloads.
+"""
+from = "now-9m"
+index = ["winlogbeat-*", "logs-windows.powershell*"]
+language = "kuery"
+license = "Elastic License v2"
+name = "PowerShell Script with Windows Defender Tampering Capabilities"
+risk_score = 21
+rule_id = "c124dc1b-cef2-4d01-8d74-ff6b0d5096b6"
+setup = """## Setup
+
+The 'PowerShell Script Block Logging' logging policy must be enabled.
+Steps to implement the logging policy with Advanced Audit Configuration:
+
+```
+Computer Configuration >
+Administrative Templates >
+Windows PowerShell >
+Turn on PowerShell Script Block Logging (Enable)
+```
+
+Steps to implement the logging policy via registry:
+
+```
+reg add "hklm\\SOFTWARE\\Policies\\Microsoft\\Windows\\PowerShell\\ScriptBlockLogging" /v EnableScriptBlockLogging /t REG_DWORD /d 1
+```
+"""
+severity = "low"
+tags = ["Domain: Endpoint", "OS: Windows", "Use Case: Threat Detection", "Tactic: Defense Evasion", "Data Source: PowerShell Logs", "Rule Type: BBR"]
+timestamp_override = "event.ingested"
+type = "query"
+building_block_type = "default"
+
+query = '''
+event.category: "process" and host.os.type:windows and
+(
+  powershell.file.script_block_text: "Set-MpPreference" and
+  powershell.file.script_block_text: (
+    DisableArchiveScanning or DisableBehaviorMonitoring or
+    DisableIntrusionPreventionSystem or DisableIOAVProtection or
+    DisableRemovableDriveScanning or DisableBlockAtFirstSeen or
+    DisableScanningMappedNetworkDrivesForFullScan or
+    DisableScanningNetworkFiles or DisableScriptScanning or
+    DisableRealtimeMonitoring or LowThreatDefaultAction or
+    ModerateThreatDefaultAction or HighThreatDefaultAction
+  )
+)
+'''
+
+
+[[rule.threat]]
+framework = "MITRE ATT&CK"
+[[rule.threat.technique]]
+id = "T1562"
+name = "Impair Defenses"
+reference = "https://attack.mitre.org/techniques/T1562/"
+[[rule.threat.technique.subtechnique]]
+id = "T1562.001"
+name = "Disable or Modify Tools"
+reference = "https://attack.mitre.org/techniques/T1562/001/"
+
+
+
+[rule.threat.tactic]
+id = "TA0005"
+name = "Defense Evasion"
+reference = "https://attack.mitre.org/tactics/TA0005/"
+[[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/"
+