Quote:Researchers believe hundreds of millions of SIM cards may be vulnerable to Simjacker attacks after determining that the targeted technology, despite being very old, is still used by at least 61 mobile operators across 29 countries.
 
AdaptiveMobile Security, a firm that specializes in cyber telecoms security, last month warned of a new SIM card attack method dubbed Simjacker. Simjacker involves sending specially crafted SMS messages to the targeted phone and it can be used to instruct the device to play a tone, send text messages, make phone calls, provide system information, launch a web browser, provide geographical information, and exfiltrate data.

AdaptiveSecurity says it has seen Simjacker attacks being launched in the past two years, likely by a surveillance company that offers its monitoring services to governments. A majority of the attacks were aimed at individuals in Mexico, with some exploitation attempts observed in Colombia and Peru.