Ransomware known variants & prevention
[Vulnerable virtual machines for learning](https://github.com/cliffe/SecGen)
https://securedorg.github.io/RE101/
http://overthewire.org/wargames
https://github.com/zardus/ctf-tools
Know Your Enemy: Learning about Security Threats (2nd Edition)
http://opensecuritytraining.info/Training.html (training) !
http://www.malware-traffic-analysis.net (pcap files)
https://www.exploit-db.com (current exploits)
https://www.cybrary.it/course/malware-analysis (training)
http://opensecuritytraining.info/Training.html (training)
http://www.securitysift.com (news & guides)
https://www.corelan.be (news & guides)
https://threatpost.com (news)
( https://twitter.com ) (news)
( https://n0where.net ) (broken site?)
https://kryptera.se (news & guides)
http://penetrationstest.se (news & guides)
https://swehack.org/ (forum)