1. APT33.
https://www.fireeye.com/blog/threat-research/2017/09/apt33-insights-into-iranian-cyber-espionage.html
2. APT34.
https://www.fireeye.com/blog/threat-research/2017/12/targeted-attack-in-middle-east-by-apt34.html
3. APT37 (REAPER).
https://www2.fireeye.com/rs/848-DID-242/images/rpt_APT37.pdf
. Accessed 03 June 2019
4. APT38.
https://www.fireeye.com/blog/threat-research/2018/10/apt38-details-on-new-north-korean-regime-backed-threat-group.html
5. APT38, Un-usual Suspects.
https://content.fireeye.com/apt/rpt-apt38