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Researchers at AdaptiveMobile Security, a firm that specializes in cyber telecoms security, have disclosed a new SIM card attack method that could work against over 1 billion mobile phones, and they claim it has already been exploited by a surveillance company to track users.

Dubbed Simjacker, the attack involves sending a specially crafted SMS message to the targeted phone. The message contains SIM Toolkit (STK) instructions and it’s processed by the SIM card (the universal integrated circuit card, or UICC), specifically the S@T Browser present on the SIM.

An attacker could use this method to send a wide range of STK commands to the targeted device, including for playing a tone, sending SMS messages, making phone calls, collecting information about the device (location, IMEI, battery, language), launching a web browser, powering off the card, requesting geographical location, and exfiltrating data.

For tips on mitigation tactics, check out the KnowBe4 blog post here.