A highly targeted cyber attack against an East Asian IT company involved the deployment of a custom malware written in Golang called RDStealer.
“The operation was active for more than a year with the end goal of compromising credentials and data exfiltration,” Bitdefender security researcher Victor Vrabie said in a technical report shared with The Hacker News.
Evidence gathered by the Romanian cybersecurity firm shows that the campaign – dubbed RedClouds – started in early 2022. The targeting aligns with the interest of China-based threat actors.
In the early phases, the operation relied on readily available remote access and post-exploitation tools like AsyncRAT and Cobalt Strike, before transitioning to bespoke malware in late 2021 or early 2022 in a bid to thwart detection.