Hackers Found Using CrossC2 to Expand Cobalt Strike Beacon's Reach to Linux and macOS
Aug 14, 2025
Threat Intelligence / Linux
Japan's CERT coordination center (JPCERT/CC) on Thursday revealed it observed incidents that involved the use of a command-and-control (C2) framework called CrossC2 , which is designed to extend the functionality of Cobalt Strike to other platforms like Linux and Apple macOS for cross-platform system control. The agency said the activity was detected between September and December 2024, targeting multiple countries, including Japan, based on an analysis of VirusTotal artifacts. "The attacker employed CrossC2 as well as other tools such as PsExec, Plink, and Cobalt Strike in attempts to penetrate AD. Further investigation revealed that the attacker used custom malware as a loader for Cobalt Strike," JPCERT/CC researcher Yuma Masubuchi said in a report published today. The bespoke Cobalt Strike Beacon loader has been codenamed ReadNimeLoader. CrossC2, an unofficial Beacon and builder, is capable of executing various Cobalt Strike commands after establishing communicati...
