Query: Sigma YAML for windows / process_creation
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 network connections via finger.exe, which can be abused by threat actors to retrieve remote commands for executi. Logsource: windows / network_connection. Rule: title: Network Connection Initiated via Finger.EXE id: 2fdaf50b-9fd5-449f-ba69-f17248119af6 related: - id: c082c2b0-525b-4dbc-9a26-a57dc4692074 type: similar - id: af491bca-e752-4b44-9c86-df5680533dbc type: similar status: experimental description: 'Detects network connections via finger.exe, which can be abused by threat actors to retrieve remote commands for execution on Windows devices. In one ClickFix malware campaign, adversaries leveraged the finger protocol to fetch commands from a remote server. Since the finger utility is not commonly used in modern Windows environments, its presence already raises suspicion. Investigating such network connections can also help identify potential malicious infrastructure used by threat actors ' references: - https://www.bleepingcomputer.com/news/security/decades-old-finger-protocol-abused-in-clickfix-malware-attacks/ author: Swachchhanda Shrawan Poudel (Nextron Systems) date: 2025-11-19 tags: - attack.command-and-control - attack.t1071.004 - attack.execution - attack.t1059.003 logsource: category: network_connection product: windows detection: selection: Initiated: 'true' Image|endswith: \finger.exe condition: selection falsepositives: - Unlikely level: high