Public/ml-exclusions.ps1
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function ConvertTo-FalconMlExclusion { <# .SYNOPSIS Output required fields to create a Machine Learning exclusion from a Falcon detection .DESCRIPTION Uses the 'behaviors' and 'device' properties of a detection to generate the necessary fields to create a new Machine Learning exclusion. Specfically, it maps the following properties these fields: behaviors.filepath > value device.groups > groups The 'value' field is stripped of any leading NT file path ('Device/HarddiskVolume'). If the detection involves a device that is not in any groups,it uses 'all' to target all host groups. The resulting output can be passed to 'New-FalconMlExclusion' to create an exclusion. .PARAMETER Detection Falcon detection content, including 'behaviors' and 'device' .LINK https://github.com/crowdstrike/psfalcon/wiki/Detection-and-Prevention-Policies #> [CmdletBinding()] param( [Parameter(Mandatory,ValueFromPipeline,Position=1)] [System.Object]$Detection ) begin { [System.Collections.Generic.List[object]]$Output = @() } process { if ($_.behaviors -and $_.device) { @($_.behaviors).Where({ $_.tactic -match '^(Machine Learning|Malware)$' }).foreach{ $Output.Add(([PSCustomObject]@{ value = $_.filepath -replace '\\Device\\HarddiskVolume\d+\\',$null excluded_from = @('blocking') groups = if ($Detection.device.groups) { $Detection.device.groups } else { 'all' } comment = "Created from $($Detection.detection_id) by $((Show-FalconModule).UserAgent)." })) } } else { foreach ($Property in @('behaviors','device')) { if (!$_.$Property) { throw "[ConvertTo-FalconMlExclusion] Missing required '$Property' property." } } } } end { if ($Output) { @($Output | Group-Object value).foreach{ $_.Group | Select-Object -First 1 }}} } function Edit-FalconMlExclusion { <# .SYNOPSIS Modify a Machine Learning exclusion .DESCRIPTION Requires 'Machine Learning Exclusions: Write'. .PARAMETER Value RegEx pattern value .PARAMETER GroupId Host group identifier or 'all' to apply to all hosts .PARAMETER Comment Audit log comment .PARAMETER Id Exclusion identifier .LINK https://github.com/crowdstrike/psfalcon/wiki/Detection-and-Prevention-Policies #> [CmdletBinding(DefaultParameterSetName='/policy/entities/ml-exclusions/v1:patch',SupportsShouldProcess)] param( [Parameter(ParameterSetName='/policy/entities/ml-exclusions/v1:patch',ValueFromPipelineByPropertyName, Position=1)] [string]$Value, [Parameter(ParameterSetName='/policy/entities/ml-exclusions/v1:patch',ValueFromPipelineByPropertyName, Position=2)] [Alias('groups','GroupIds')] [object[]]$GroupId, [Parameter(ParameterSetName='/policy/entities/ml-exclusions/v1:patch',ValueFromPipelineByPropertyName, Position=3)] [string]$Comment, [Parameter(ParameterSetName='/policy/entities/ml-exclusions/v1:patch',Mandatory, ValueFromPipelineByPropertyName,Position=4)] [ValidatePattern('^[a-fA-F0-9]{32}$')] [string]$Id ) begin { $Param = @{ Command = $MyInvocation.MyCommand.Name Endpoint = $PSCmdlet.ParameterSetName Format = @{ Body = @{ root = @('groups','id','value','comment') }} } } process { if ($PSBoundParameters.GroupId.id) { # Filter to 'id' if supplied with 'detailed' objects [string[]]$PSBoundParameters.GroupId = $PSBoundParameters.GroupId.id } if ($PSBoundParameters.GroupId) { @($PSBoundParameters.GroupId).foreach{ if ($_ -notmatch '^([a-fA-F0-9]{32}|all)$') { throw "'$_' is not a valid Host Group identifier." } } } Invoke-Falcon @Param -Inputs $PSBoundParameters } } function Get-FalconMlExclusion { <# .SYNOPSIS Search for Machine Learning exclusions .DESCRIPTION Requires 'Machine Learning Exclusions: Read'. .PARAMETER Id Exclusion identifier .PARAMETER Filter Falcon Query Language expression to limit results .PARAMETER Sort Property and direction to sort results .PARAMETER Limit Maximum number of results per request .PARAMETER Offset Position to begin retrieving results .PARAMETER Detailed Retrieve detailed information .PARAMETER All Repeat requests until all available results are retrieved .PARAMETER Total Display total result count instead of results .LINK https://github.com/crowdstrike/psfalcon/wiki/Detection-and-Prevention-Policies #> [CmdletBinding(DefaultParameterSetName='/policy/queries/ml-exclusions/v1:get',SupportsShouldProcess)] param( [Parameter(ParameterSetName='/policy/entities/ml-exclusions/v1:get',ValueFromPipeline, ValueFromPipelineByPropertyName,Mandatory)] [ValidatePattern('^[a-fA-F0-9]{32}$')] [Alias('Ids')] [string[]]$Id, [Parameter(ParameterSetName='/policy/queries/ml-exclusions/v1:get',Position=1)] [ValidateScript({ Test-FqlStatement $_ })] [string]$Filter, [Parameter(ParameterSetName='/policy/queries/ml-exclusions/v1:get',Position=2)] [ValidateSet('applied_globally.asc','applied_globally.desc','created_by.asc','created_by.desc', 'created_on.asc','created_on.desc','last_modified.asc','last_modified.desc','modified_by.asc', 'modified_by.desc','value.asc','value.desc',IgnoreCase=$false)] [string]$Sort, [Parameter(ParameterSetName='/policy/queries/ml-exclusions/v1:get',Position=3)] [ValidateRange(1,500)] [int32]$Limit, [Parameter(ParameterSetName='/policy/queries/ml-exclusions/v1:get')] [int32]$Offset, [Parameter(ParameterSetName='/policy/queries/ml-exclusions/v1:get')] [switch]$Detailed, [Parameter(ParameterSetName='/policy/queries/ml-exclusions/v1:get')] [switch]$All, [Parameter(ParameterSetName='/policy/queries/ml-exclusions/v1:get')] [switch]$Total ) begin { $Param = @{ Command = $MyInvocation.MyCommand.Name Endpoint = $PSCmdlet.ParameterSetName Format = @{ Query = @('sort','ids','offset','filter','limit') } } [System.Collections.Generic.List[string]]$List = @() } process { if ($Id) { @($Id).foreach{ $List.Add($_) } } else { Invoke-Falcon @Param -Inputs $PSBoundParameters } } end { if ($List) { $PSBoundParameters['Id'] = @($List | Select-Object -Unique) Invoke-Falcon @Param -Inputs $PSBoundParameters } } } function New-FalconMlExclusion { <# .SYNOPSIS Create a Machine Learning exclusion .DESCRIPTION Requires 'Machine Learning Exclusions: Write'. 'ConvertTo-FalconMlExclusion' can be used to generate the required Machine Learning exclusion properties using an existing detection. .PARAMETER Value RegEx pattern value .PARAMETER ExcludedFrom Actions to exclude .PARAMETER GroupId Host group identifier or 'all' to apply to all hosts .PARAMETER Comment Audit log comment .LINK https://github.com/crowdstrike/psfalcon/wiki/Detection-and-Prevention-Policies #> [CmdletBinding(DefaultParameterSetName='/policy/entities/ml-exclusions/v1:post',SupportsShouldProcess)] param( [Parameter(ParameterSetName='/policy/entities/ml-exclusions/v1:post',Mandatory, ValueFromPipelineByPropertyName,Position=1)] [string]$Value, [Parameter(ParameterSetName='/policy/entities/ml-exclusions/v1:post',Mandatory, ValueFromPipelineByPropertyName,Position=2)] [ValidateSet('blocking','extraction',IgnoreCase=$false)] [Alias('excluded_from')] [string[]]$ExcludedFrom, [Parameter(ParameterSetName='/policy/entities/ml-exclusions/v1:post',Mandatory, ValueFromPipelineByPropertyName,Position=3)] [Alias('groups','GroupIds')] [object[]]$GroupId, [Parameter(ParameterSetName='/policy/entities/ml-exclusions/v1:post',ValueFromPipelineByPropertyName, Position=4)] [string]$Comment ) begin { $Param = @{ Command = $MyInvocation.MyCommand.Name Endpoint = $PSCmdlet.ParameterSetName Format = @{ Body = @{ root = @('groups','value','comment','excluded_from') }} } } process { if ($PSBoundParameters.GroupId.id) { # Filter to 'id' if supplied with 'detailed' objects [string[]]$PSBoundParameters.GroupId = $PSBoundParameters.GroupId.id } if ($PSBoundParameters.GroupId) { @($PSBoundParameters.GroupId).foreach{ if ($_ -notmatch '^([a-fA-F0-9]{32}|all)$') { throw "'$_' is not a valid Host Group identifier." } } } Invoke-Falcon @Param -Inputs $PSBoundParameters } } function Remove-FalconMlExclusion { <# .SYNOPSIS Remove Machine Learning exclusions .DESCRIPTION Requires 'Machine Learning Exclusions: Write'. .PARAMETER Comment Audit log comment .PARAMETER Id Exclusion identifier .LINK https://github.com/crowdstrike/psfalcon/wiki/Detection-and-Prevention-Policies #> [CmdletBinding(DefaultParameterSetName='/policy/entities/ml-exclusions/v1:delete',SupportsShouldProcess)] param( [Parameter(ParameterSetName='/policy/entities/ml-exclusions/v1:delete',Position=1)] [string]$Comment, [Parameter(ParameterSetName='/policy/entities/ml-exclusions/v1:delete',Mandatory,ValueFromPipeline, ValueFromPipelineByPropertyName,Position=2)] [ValidatePattern('^[a-fA-F0-9]{32}$')] [Alias('Ids')] [string[]]$Id ) begin { $Param = @{ Command = $MyInvocation.MyCommand.Name Endpoint = $PSCmdlet.ParameterSetName Format = @{ Query = @('ids','comment') } } [System.Collections.Generic.List[string]]$List = @() } process { if ($Id) { @($Id).foreach{ $List.Add($_) }}} end { if ($List) { $PSBoundParameters['Id'] = @($List | Select-Object -Unique) Invoke-Falcon @Param -Inputs $PSBoundParameters } } } |