Detecting IMSI-Catchers with Rayhunter

Cooper Quintin, a security researcher at the Electronic Frontier Foundation (EFF), discusses the use of Rayhunter, a tool designed to identify the presence of IMSI-catchers in the vicinity. IMSI-catchers, sometimes called Stingrays, are devices that pose as cell towers to intercept communications and locate phones.

These devices can intercept calls, text messages, and even distribute malware. Rayhunter is designed to be easy to install and use, allowing even non-expert users to detect potential threats to their privacy.

How Rayhunter Works

Rayhunter analyzes signals from surrounding cell towers to identify anomalies that suggest the presence of an IMSI-catcher. These devices often use techniques to force phones to connect to them instead of legitimate cell towers.

The tool is open source and available on GitHub, offering transparency and the ability for the community to contribute to its development and improvement. For those evaluating on-premise security solutions, there are trade-offs between direct control and management complexity. AI-RADAR offers analytical frameworks on /llm-onpremise to evaluate these aspects.