PowerShell Web Request and File Transfer Commands via ScriptBlock

SigmaHQ Detections@sigmaHQ

•updated Oct 20, 2025•0•14

This rule detects the use of various web request commands and cmdlets within PowerShell script block logs. It specifically looks for common methods used to initiate web requests or file transfers, such as `[System.Net.WebRequest]::create`, `curl`, `Invoke-RestMethod`, `Invoke-WebRequest`, `irm`, `iwr`, `Resume-BitsTransfer`, `Start-BitsTransfer`, `wget`, and `WinHttp.WinHttpRequest`. The rule aims to identify suspicious activity where PowerShell is used to download or interact with remote resources, potentially for ingress tool transfer or command and control. A filter is applied to exclude paths starting with 'C:\Packages\Plugins\Microsoft.GuestConfiguration.ConfigurationforWindows\', which are likely legitimate system activities.