Yalove is an Internet worm that spreads through instant messages using the Yahoo! Messenger program. Once executed, the parasite secretly installs itself to the system. Then it runs a payload. The worm terminates active antiviruses, firewalls, anti-trojan tools, other security-related programs and system utilities. It also changes some Yahoo! Messenger settings and disables the Task Manager and the Registry Editor. Furthermore, Yalove downloads from the Internet and executes malicious files. The parasite automatically runs on every Windows startup.