GREF is an alternate name for the group known as Ke3chang

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GREF is an advanced persistent threat (APT) that targets organizations in various industries, including finance and government sectors. It has been active since at least 2013 and uses sophisticated techniques to compromise systems and steal sensitive information. GREF typically employs a combination of social engineering tactics, malware delivery methods, and exploitation of vulnerabilities in software or operating systems. The group is known for its persistence and ability to remain undetected within networks for extended periods of time.

Techniques, tactics and practices:

GREF is an advanced persistent threat that employs a variety of techniques to compromise systems and steal sensitive information. Some common methods used by this group include social engineering tactics, such as phishing emails or targeted spear-phishing attacks; malware delivery mechanisms like exploit kits, Trojan horses, and other types of malicious software; and the exploitation of vulnerabilities in operating systems or software to gain access to sensitive data. GREF is also known for its persistence, often remaining undetected within networks for extended periods of time through various evasion techniques such as hiding their activities from security tools and monitoring systems.