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S0602 Circles

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

Item Value
ID S0602
Associated Names
Version 1.0
Created 26 April 2021
Last Modified 26 April 2021
Navigation Layer View In ATT&CK® Navigator

Techniques Used

Domain ID Name Use
mobile T1449 Exploit SS7 to Redirect Phone Calls/SMS Circles can intercept voice calls and SMS messages.1
mobile T1450 Exploit SS7 to Track Device Location Circles can track the location of mobile devices.1


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