"In short, Rayhunter is an open source Linux program that runs on a variety of mobile hotspots (dedicated devices that use a cellular connection to give you Wi-Fi). Rayhunter's job is to look for cell-site simulators (CSS), a tool police use to locate or identify people's cell phones, also known as IMSI catchers or Stingrays. Rayhunter analyzes the "handshakes" between your Rayhunter device and the cell towers it is connected to for behaviors consistent with that of a CSS."
"We've been blown away by the level of community engagement on this project. It has been installed on thousands of devices (or so we estimate, we don't actually know since Rayhunter doesn't have any telemetry!). We have received dozens of packet captures, hundreds of improvements, both minor and major, documentation fixes, and bug reports from our open source community. This project is a testament to the power and impact of open source and community driven counter-surveillance."
Rayhunter is an open source Linux program that runs on mobile hotspots to detect cell-site simulators (CSS), also known as IMSI catchers or Stingrays. The tool analyzes handshake behaviors between the hotspot and cellular towers to identify patterns consistent with CSS and alerts users with on-screen indicators and optional push notifications. Community contributions provided packet captures, improvements, documentation fixes, and bug reports, enabling widespread deployment on thousands of devices. The project aims to understand CSS usage at protests; so far no evidence of CSS spying on protests in the United States has been observed. Limitations remain since absence of detected events does not prove non-use.
Read at Electronic Frontier Foundation
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