Fujacks.b is a worm that spreads through network shares protected by weak passwords. It also propagates by copying itself to local hard drives. Furthermore, the parasite attempts to infect all executable files it finds on the compromised computer. Fujacks.b carries a dangerous payload. It terminates running popular antiviruses, firewalls and other security-related applications. It may also delete some executable files and disable installed security software. The worm secretly runs on every Windows startup.