Query: detection rule: Detects the use of PowerShell to execute the 'Set-MpPreference' cmdlet to configure Windows Defender's threat severity d
Matching passage: Sigma rule: Detects the use of PowerShell to execute the 'Set-MpPreference' cmdlet to configure Windows Defender's threat severity d. Logsource: windows / process_creation. Rule: title: PowerShell Defender Threat Severity Default Action Set to 'Allow' or 'NoAction' id: 1e8a9b4d-3c2a-4f9b-8d1e-7c6a5b4f3d2e related: - id: 5a9e1b2c-8f7d-4a1e-9b3c-0f6d7e5a4b1f type: similar status: experimental description: 'Detects the use of PowerShell to execute the ''Set-MpPreference'' cmdlet to configure Windows Defender''s threat severity default action to ''Allow'' (value ''6'') or ''NoAction'' (value ''9''). This is a highly suspicious configuration change that effectively disables Defender''s ability to automatically mitigate threats of a certain severity level. An attacker might use this technique via the command line to bypass defenses before executing payloads. ' references: - https://learn.microsoft.com/en-us/powershell/module/defender/set-mppreference - https://learn.microsoft.com/en-us/windows-hardware/customize/desktop/unattend/security-malware-windows-defender-threatseveritydefaultaction - https://research.splunk.com/endpoint/7215831c-8252-4ae3-8d43-db588e82f952 - https://gist.github.com/Dump-GUY/8daef859f382b895ac6fd0cf094555d2 - https://thedfirreport.com/2021/10/18/icedid-to-xinglocker-ransomware-in-24-hours/ author: Matt Anderson (Huntress) date: 2025-07-11 tags: - attack.defense-impairment - attack.t1685 logsource: category: process_creation product: windows detection: selection_cmdlet: CommandLine|contains: Set-MpPreference selection_action: CommandLine|contains: - -LowThreatDefaultAction - -ModerateThreatDefaultAction - -HighThreatDefaultAction - -SevereThreatDefaultAction - '-ltdefac ' - '-mtdefac ' - '-htdefac ' - '-stdefac ' selection_value: CommandLine|contains: - Allow - '6' - NoAction - '9' condition: all of selection_* falsepositives: - Highly unlikely level: high
Near-miss passage: Sigma rule: Detects the execution of netsh commands that configure a new port forwarding (PortProxy) rule. Logsource: windows / process_creation. Rule: title: New Port Forwarding Rule Added Via Netsh.EXE id: 322ed9ec-fcab-4f67-9a34-e7c6aef43614 status: test description: Detects the execution of netsh commands that configure a new port forwarding (PortProxy) rule references: - https://www.fireeye.com/blog/threat-research/2019/01/bypassing-network-restrictions-through-rdp-tunneling.html - https://adepts.of0x.cc/netsh-portproxy-code/ - https://www.dfirnotes.net/portproxy_detection/ author: Florian Roth (Nextron Systems), omkar72, oscd.community, Swachchhanda Shrawan Poudel date: 2019-01-29 modified: 2023-09-01 tags: - attack.lateral-movement - attack.command-and-control - attack.t1090 logsource: category: process_creation product: windows detection: selection_img: - Image|endswith: \netsh.exe - OriginalFileName: netsh.exe selection_cli_1: CommandLine|contains|all: - interface - portproxy - add - v4tov4 selection_cli_2: CommandLine|contains|all: - 'i ' - 'p ' - 'a ' - 'v ' selection_cli_3: CommandLine|contains|all: - connectp - listena - c= condition: selection_img and 1 of selection_cli_* falsepositives: - Legitimate administration activity - WSL2 network bridge PowerShell script used for WSL/Kubernetes/Docker (e.g. https://github.com/microsoft/WSL/issues/4150#issuecomment-504209723) level: medium