VBScript

VBScript is an interpreted script language from Microsoft that is a subset of its Visual Basic programming language released in 1991 and was superceded by the .NET version which ended development in March 2020.
https://en.wikipedia.org/wiki/Visual_Basic_(.NET)

Ranked 6th in the most popular programming languages, it has seen a surge of increased usage since 2020 but is now considered to be on the decline.
https://www.tiobe.com/tiobe-index/

Using Cybersecurity controls to block access to online resources based upon Categorisation, Deny Lists, Firewall rules etc is not effective as Data Loss Prevention technologies.
The use of this upload method demonstrates it is trivial for anyone that has access to a web browser and the internet, to easily move sensitive/confidential data outside of organisations.

The likelihood of such a Data Loss risk event occurring must be considered.
The impact of a Data Loss risk event will depend on the content and amount of information that has been uploaded via VBScript.

Use DLP-TEST to assess: - 

- Coverage of DLP Technologies to detect data being uploaded via the VBScript method.
- Capability of DLP Technologies to accurately detect sensitive/confidential data being uploaded via the VBScript method.
- Ability of DLP technologies to ignore data being uploaded that is NOT sensitive or confidential.