Circles reportedly takes advantage of Signaling System 7 (SS7) weaknesses, the protocol suite used to route phone calls, to both track the location of mobile devices and intercept voice calls and SMS messages. It can be connected to a telecommunications company’s infrastructure or purchased as a cloud service. Circles has reportedly been linked to the NSO Group.[1]

ID: S0602
Version: 1.0
Created: 26 April 2021
Last Modified: 26 April 2021

Techniques Used

Domain ID Name Use
Mobile T1430 .002 Location Tracking: Impersonate SS7 Nodes

Circles can track the location of mobile devices.[1]