Julie.mp4.mkv.mp4 -

A user sees the file name and immediately assumes it is a standard video file.

.mp4 and .mkv are both video containers. There is no legitimate reason to stack them consecutively in a single file name. JULIE.mp4.mkv.mp4

Automated file rippers, conversion scripts, or peer-to-peer file sharing networks sometimes glitch and append duplicate extensions during automated processing cycles. A user sees the file name and immediately

Even if this specific file is just a poorly named video rather than a virus, its structure indicates severe handling issues: JULIE.mp4.mkv.mp4

If you downloaded a file from an untrusted source, right-click it and run a scan with your antivirus software before double-clicking it.

The most dangerous application of this naming convention occurs when attackers hide executable files behind harmless media extensions.