APT28

APT28, also known as Fancy Bear or Pawn Storm, is an advanced persistent threat (APT) group that has been active since at least 2007 and is believed to be associated with Russian military intelligence agency GRU. APT28 is responsible for a number of high-profile cyber attacks on government organizations, political parties, media outlets, and other targets in Europe and North America. The group uses sophisticated techniques such as spear phishing emails, malware, and social engineering to gain access to their targets networks and steal sensitive information. APT28 is considered one of the most dangerous cyber threats facing governments and organizations around the world today.

Techniques, tactics and practices: 

APT28 uses a variety of sophisticated techniques to gain access to their targets networks. These include spear phishing emails that are designed to trick users into clicking on links or downloading attachments, which contain malware such as backdoor Trojans and remote administration tools (RATs). 

APT28 also uses social engineering tactics, such as impersonating legitimate organizations in order to gain access to their networks. Additionally, the group is known for using zero-day vulnerabilities or exploiting existing ones that have not been patched by software vendors yet. They are able to persist on a targets network over time and maintain access through various techniques such as stealth, obfuscation, and evasion tactics. APT28 is considered one of the most dangerous cyber threats facing governments and organizations around the world today due to their advanced capabilities and persistent nature.