hijack
verb [ T ]
uk/ˈhaɪdʒæk/ usto take control of something, such as another person's plan, a system, or a meeting for your own advantage:
The association is annoyed that its campaign has been hijacked by pin-striped PR men.
IT
to take control of a computer belonging to someone else without their permission, especially for illegal purposes:
Hundreds of the department's powerful computers were hijacked by hackers, who used them to send spam email.