Two days later, his laptop started acting strange. The cooling fan spun at maximum speed even when no programs were open. Random command prompts flashed on his screen for a fraction of a second. Then, the real nightmare began: he received an alert from his bank. Someone had attempted a $2,000 wire transfer to an offshore account.

By trying to save fifty dollars, he had lost his work, his privacy, and his peace of mind. The documentary on street art would never be finished.

Leo was a freelance video editor living on a shoestring budget. His old laptop was his lifeblood, and his latest project—a documentary on local street art—required high-resolution clips from a variety of online platforms.

When the installation finished, the program actually worked. He was downloading 4K videos at lightning speed. He felt like he’d beaten the system. But the victory was short-lived.

A single text file sat on his desktop: READ_ME_FOR_YOUR_FILES.txt . It demanded two Bitcoin in exchange for a decryption key. The "crack" he thought was a bargain had actually been a Trojan horse, a piece of ransomware designed to wait until he was most vulnerable.