Given its targets, as well as the information it goes after, there is little doubt that UNC3524 is interested in financial gain. However, its operational profile differs markedly from those of other financially oriented hacker groups, according to Mandiant. Its sophisticated approach to espionage demonstrates aspects that are typically associated with government-sponsored intelligence operations. Notably, UNC3524 operatives take their time to get to know their targets, and are not in a hurry to exploit the online environments they penetrate. Mandiant reported that UNC3524 attacks can take up to 18 months to conclude. In contrast, the average financially-motivated cyber-espionage attack rarely lasts longer than three weeks.

Additionally, UNC3524 operatives make a point of maintaining an extremely stealthy and low-key online profile, and have even developed a series of novel exploitation techniques, which Mandiant has termed “QuietExit”. The latter appear to focus on exploiting Internet of Things (IoT) devices that are typically found in corporate settings, but are not protected by traditional anti-virus systems. Once they penetrate the digital environment of their target, UNC3524 operatives meticulously build sophisticated back-doors into the system, and are known to return sometimes within hours after they are detected and repelled.

Interestingly, UNC3524 operatives do not waste time on low-level employees of targeted corporations. Once inside, they go straight for executive-level targets, including those in corporate strategy and development, mergers and acquisitions, and even information security. Mandiant says a few other actors, notably Russian-linked groups like Cozy Bear, Fancy Bear, APT28 or APT29, are also known to operate with such high-level targets in mind. However, there is little other operational overlap between them and UNC3524, the blog post claims.