Lets look at another practical example of weaponizing WMI using PowerShell. Earlier we went over how to create a custom WMI class. Using this class along with the Set-WmiInstance command we can create a class that we can then use to store files as Base64 Encoded strings.
To simplify this process, I created a module called Invoke-WMIFS.ps1. To start we will import the module:
PS C:\> Import-Module Invoke-WMIFS.ps1
This module provides the following functions:
To start, we use the function New-WmiClass to create a class that is preconfigured to store the files.
Then to place the file into out WMIFS WMI class we use the Invoke-InsertFile function. This will slice the file into lengths predetermined by Get-WmiLength and place the chunks into the class we created.
Then to write the file back to disk, we use the ConvertFrom-Base64 function.
PS C:\> ConvertFrom-Base64 -EncodedText $File -FileName 'C:\innocuous.pdf' -Verbose
VERBOSE: Decoding File
VERBOSE: Finished Decoding File
VERBOSE: Writing File to Disk as C:\innocuous.pdf
Additionally, the option to use the pipeline and encrypt the file store is available. By default, it uses the current user’s certificate as the encryption key, but optionally a key can be explicitly specified.
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