
The Windows operating system (OS) had a vulnerability that allowed people to hide a file’s true extension, which hackers were able to use and distribute files that looked like .PDF documents, but were in fact weaponized .HTA files.
In the most recent Patch Tuesday cumulative update, Microsoft addressed a flaw described as "Windows MSHTML spoofing vulnerability", and tracked as CVE-2024-43461. This flaw was apparently used by a threat actor known as Void Banshee to deploy the Atlantida infostealer.