Google is warning of multiple threat actors sharing a public proof-of-concept (PoC) exploit that leverages its Calendar service to host command-and-control (C2) infrastructure.
The tool, called Google Calendar RAT (GCR), employs Google Calendar Events for C2 using a Gmail account. It was first published to GitHub in June 2023.
"The script creates a 'Covert Channel' by exploiting the event descriptions in Google Calendar," according to its developer and researcher, who goes by the online alias MrSaighnal. "The target will connect directly to Google." Read More..