Lecture 20: May 15, 2026

Reading: text, §23.3.22–23.7, 23.9
Assignments: Homework 4, due May 27, 2026

1. Greetings and felicitations!

2. Computer virus
   1. Concealment: TSR, stealth, encrypted, polymorphic, metamorphic

3. Computer worm

4. Bots and Botnets

5. Miscellaneous malware
   1. Rabbits, bacteria

Matt Bishop Office: 2209 Watershed Sciences Phone: +1 (530) 752-8060 Email: mabishop@ucdavis.edu

ECS 153A, Computer & Information Security & Privacy I Version of May 19, 2026 at 10:51AM

You can also obtain a PDF version of this.