Query: alert when 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 when an attacker register a new SIP provider for persistence and defense evasion. Logsource: windows / registry_set. Rule: title: Persistence Via New SIP Provider id: 5a2b21ee-6aaa-4234-ac9d-59a59edf90a1 status: test description: Detects when an attacker register a new SIP provider for persistence and defense evasion references: - https://persistence-info.github.io/Data/codesigning.html - https://github.com/gtworek/PSBits/tree/master/SIP - https://specterops.io/assets/resources/SpecterOps_Subverting_Trust_in_Windows.pdf author: Nasreddine Bencherchali (Nextron Systems) date: 2022-07-21 modified: 2023-08-17 tags: - attack.persistence - attack.defense-impairment - attack.t1553.003 logsource: category: registry_set product: windows detection: selection_root: TargetObject|contains: - \SOFTWARE\Microsoft\Cryptography\Providers\ - \SOFTWARE\Microsoft\Cryptography\OID\EncodingType - \SOFTWARE\WOW6432Node\Microsoft\Cryptography\Providers\ - \SOFTWARE\WOW6432Node\Microsoft\Cryptography\OID\EncodingType selection_dll: TargetObject|contains: - \Dll - \$DLL filter: Details: - WINTRUST.DLL - mso.dll filter_poqexec: Image: C:\Windows\System32\poqexec.exe TargetObject|contains: \CryptSIPDll Details: C:\Windows\System32\PsfSip.dll condition: all of selection_* and not 1 of filter* falsepositives: - Legitimate SIP being registered by the OS or different software. level: medium