AdaptiveMobile Security have uncovered a new and previously undetected vulnerability and associated exploits, called Simjacker. This vulnerability is currently being actively exploited by a specific private company that works with governments to monitor individuals. Simjacker and its associated exploits is a huge jump in complexity and sophistication compared to attacks previously seen over mobile core networks. The main Simjacker attack involves an SMS containing a specific type of spyware-like code being sent to a mobile phone, which then instructs the SIM Card within the phone to ‘take over’ the mobile phone to retrieve and perform sensitive commands. The location information of thousands of devices was obtained over time without the knowledge or consent of the targeted mobile phone users. During the attack, the user is completely unaware that they received the attack, that information was retrieved, and that it was successfully exfiltrated. However the Simjacker attack can, and has been extended further to perform additional types of attacks.