EventLog/Get-SysmonFileStreamHash.ps1
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function Get-SysmonFileStreamHash { <# .SYNOPSIS Get Sysmon File Stream Creation events (EventId 15). .DESCRIPTION This event logs when a named file stream is created, and it generates events that log the hash of the contents of the file to which the stream is assigned (the unnamed stream), as well as the contents of the named stream. There are malware variants that drop their executables or configuration settings via browser downloads, and this event is aimed at capturing that based on the browser attaching a Zone.Identifier “mark of the web” stream. This event also logs the creation of alternate data streams where a files hides another in the alternate data stream of another. .EXAMPLE PS C:\> Get-SysmonFileStreamHash -Image 'C:\WINDOWS\system32\cmd.exe' Find all streams created from cmd.exe. .INPUTS System.IO.FileInfo .OUTPUTS Sysmon.EventRecord.FileCreateStreamHash .NOTES https://www.ultimatewindowssecurity.com/securitylog/encyclopedia/event.aspx?eventid=90015 #> [CmdletBinding(DefaultParameterSetName = 'Local')] param ( # Log name for where the events are stored. [Parameter(Mandatory = $false, ValueFromPipelineByPropertyName = $true)] [string] $LogName = 'Microsoft-Windows-Sysmon/Operational', # Process GUID of the process that created a file stream. [Parameter(Mandatory = $false, ValueFromPipelineByPropertyName = $true)] [string[]] $ProcessGuid, # Process Id of the process that created a file stream. [Parameter(Mandatory = $false, ValueFromPipelineByPropertyName = $true)] [string[]] $ProcessId, # Full path of the process image that created a file stream. [Parameter(Mandatory = $false, ValueFromPipelineByPropertyName = $true)] [string[]] $Image, # Name of the file where the file stream was created. [Parameter(Mandatory = $false, ValueFromPipelineByPropertyName = $true)] [string[]] $TargetFileName, # Hash for the alternate data stream that was created. [Parameter(Mandatory = $false, ValueFromPipelineByPropertyName = $true)] [string[]] $Hash, # Rule Name for filter that generated the event. [Parameter(Mandatory = $false, ValueFromPipelineByPropertyName = $true)] [string[]] $RuleName, # Specifies the path to the event log files that this cmdlet get events from. Enter the paths to the log files in a comma-separated list, or use wildcard characters to create file path patterns. Function supports files with the .evtx file name extension. You can include events from different files and file types in the same command. [Parameter(Mandatory=$true, Position=0, ParameterSetName="file", ValueFromPipelineByPropertyName=$true)] [Alias("FullName")] [ValidateNotNullOrEmpty()] [SupportsWildcards()] [string[]] $Path, # Gets events from the event logs on the specified computer. Type the NetBIOS name, an Internet Protocol (IP) address, or the fully qualified domain name of the computer. # The default value is the local computer. # To get events and event logs from remote computers, the firewall port for the event log service must be configured to allow remote access. [Parameter(Mandatory = $true, ValueFromPipelineByPropertyName = $true, ParameterSetName = 'Remote')] [string[]] $ComputerName, # Specifies a user account that has permission to perform this action. # # Type a user name, such as User01 or Domain01\User01. Or, enter a PSCredential object, such as one generated by the Get-Credential cmdlet. If you type a user name, you will # be prompted for a password. If you type only the parameter name, you will be prompted for both a user name and a password. [Parameter(Mandatory = $false, ParameterSetName = 'Remote')] [Management.Automation.PSCredential] [Management.Automation.CredentialAttribute()] $Credential, # Specifies the maximum number of events that are returned. Enter an integer. The default is to return all the events in the logs or files. [Parameter(Mandatory = $false, ValueFromPipelineByPropertyName = $true)] [int64] $MaxEvents, # Stsrttime from where to pull events. [Parameter(Mandatory = $false)] [datetime] $StartTime, # Stsrttime from where to pull events. [Parameter(Mandatory = $false)] [datetime] $EndTime, # Changes the default logic for matching fields from 'and' to 'or'. [Parameter(Mandatory = $false)] [switch] $ChangeLogic, # Changes the query action from inclusion to exclusion when fields are matched. [Parameter(Mandatory = $false)] [switch] $Suppress ) begin {} process { Search-SysmonEvent -EventId 15 -ParamHash $MyInvocation.BoundParameters } end {} } |