This is the most immediate threat. "Keygens" (key generators) and cracked software files are favorite hiding spots for trojans, ransomware, and spyware. Because the user is actively seeking to bypass security (the software license), they often disable their antivirus protection to run the crack. This leaves the computer wide open to infection. Keyloggers, which record every keystroke (including passwords and credit card numbers), are commonly bundled with these downloads.