warbot

From war +‎ -bot.

warbot (plural warbots)

1. A robot used in physical warfare.
2. (Internet) A malicious bot (automated user) designed to disrupt other users' activity.
   • 1995, William J. Shefski, Interactive Internet: The Insider's Guide to MUDs, MOOs and IRC:

     A warbot is designed for use against other users or against IRC itself. Bots meant to do harm are one reason why many servers have banned their presence.

• Bartow, tow bar, towbar