China-Backed Hackers Target European Firms with New BRICKSTORM Malware

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Recent revelations have unveiled a covert cyber espionage operation targeting European businesses with a sophisticated tool called BRICKSTORM. China-backed hackers have advanced their tactics by modifying this previously Linux-specific malware to now breach Windows-based systems. On April 15, NVISO, a European cybersecurity company, released an in-depth report, shedding light on the activities and implications of these new developments. The report detailed two new Windows BRICKSTORM samples uncovered, indicating an ongoing espionage campaign against important European industries since the previous year. Written in Go, these new samples allow for intricate file management and network tunneling, equipping attackers with the ability to move laterally within targeted systems and evade detection.

Analysis of BRICKSTORM’s Capabilities

Unlike its Linux counterpart, the Windows version of BRICKSTORM samples lacks direct command execution. Yet, it achieves similar outcomes by utilizing network tunneling and legitimate credentials to exploit protocols such as Remote Desktop Protocol (RDP) and Server Message Block (SMB). This calculated strategy employs DNS over HTTPS (DoH) to communicate with command-and-control (C2) servers, thereby bypassing traditional security methods like DNS monitoring and geo-blocking. Attackers also implement persistence techniques, such as scheduled tasks, to maintain access to compromised systems while remaining unnoticed.

A key component of these attacks involves using serverless providers like Cloudflare and Heroku for C2 operations. Exploiting these distributed providers’ IP addresses helps attackers mask their activities, complicating detection efforts by defense mechanisms. Despite seeming basic, BRICKSTORM’s success hinges on precise execution and adaptability, showcasing the expertise of state-sponsored cyber operatives. NVISO’s analysis underscores the urgent need for sectors vulnerable to these threats to bolster their cybersecurity measures and rigorously monitor for irregular activities.

Ultimately, the transition of BRICKSTORM from Linux to Windows platforms highlights the relentless evolution of cyber threats led by nation-state actors. The malware’s persistent effectiveness underscores the necessity for industries to stay alert and proactive. Enhancing defense mechanisms and maintaining vigilant surveillance for unusual activities are essential steps to defend against these advanced cyber threats.

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