Describe a computer virus method of infection step by step

Describe a computer virus method of infection step by step, similar to the description provided in Module 6 of the Control section in the description of our course (“Method of Infection”).
Vocabulary: Viruses, Cause and Effect, Phrasal Verbs, linking words.
Grammar: Present Simple Active and Passive, If- and When- clauses, -ing forms, Participles.
You will get a mark according to the scale that you can find in Control section on the site of our course.
Нужен доклад примерно на 3 страницы на англ.яз.