Defense Evasion (TA0005)(external, opens in a new tab or window)
text code block:event.category:process and host.os.type:windows and powershell.file.script_block_text : ( "[System.Reflection.Assembly]::Load" or "[Reflection.Assembly]::Load" or "Assembly.Load(" ) and not powershell.file.script_block_text : ( ("CommonWorkflowParameters" or "RelatedLinksHelpInfo") and "HelpDisplayStrings" ) and not (powershell.file.script_block_text : ("Get-SolutionFiles" or "Get-VisualStudio" or "Select-MSBuildPath") and file.name : "PathFunctions.ps1" ) and not powershell.file.script_block_text : ( "Microsoft.PowerShell.Workflow.ServiceCore" and "ExtractPluginProperties([string]$pluginDir" ) and not powershell.file.script_block_text : ("reflection.assembly]::Load('System." or "LoadWithPartialName('Microsoft." or "::Load(\"Microsoft." or "Microsoft.Build.Utilities.Core.dll") and not user.id : "S-1-5-18"
Install detection rules in Elastic Security
Detect Suspicious .NET Reflection via PowerShell in the Elastic Security detection engine by installing this rule into your Elastic Stack.
To setup this rule, check out the installation guide for Prebuilt Security Detection Rules(external, opens in a new tab or window).