Last month, Malware Design Strategies (Part 1) paper was published in virus bulletin magazine. Continuing from there, part 2 of the paper is published this month's. It is available here - http://secniche.blogspot.com/2012/05/malware-design-strategies.html.
In this paper, we have discussed about:-
1. Polymorphic and metamorphic encryption
2. Anti-debugging tricks
3. Ant-traffic analysis stuff
4. Deployed tactics to detect virulent code.
Right now, subscription is required to read paper. We will release it after couple of weeks.