Sednit is an advanced persistent threat (APT) group that has been active since at least 2014 and is believed to be associated with Russian military intelligence agency GRU. The group is responsible for several high-profile cyber attacks, including the NotPetya ransomware attack in June 2017 which caused widespread disruption across Europe and Asia. Sednit has been linked to other APT groups such as Fancy Bear (APT28) and Sandworm/BlackEnergy. The group is known for its sophisticated tactics, including the use of zero-day exploits and spear phishing campaigns targeting government agencies, political organizations, media outlets, and other high-profile targets. Sednit has been designated as a threat actor by several security firms, including CrowdStrike and FireEye.

Techniques, tactics and practices:

Sednit is an advanced persistent threat group that uses a variety of techniques to carry out its attacks. Some of these include spear phishing campaigns targeting high-profile individuals and organizations, the use of zero-day exploits in order to bypass security measures, and the deployment of malware such as ransomware and spyware. The group is also known for using social engineering tactics to gain access to sensitive information or systems, including impersonating legitimate entities through email phishing campaigns. Sednit has been described as a highly sophisticated threat actor that employs advanced techniques in order to carry out its attacks and evade detection by security measures.