Dissecting TriangleDB, a Triangulation spyware implant on IOS. How the attackers would know about ?

They Found The iPhone Backdoor by Mental Outlaw

https://odysee.com/@AlphaNerd:8/they-found-the-iphone-backdoor:5

Article by Kaspesrky

https://securelist.com/triangledb-triangulation-implant/110050/

detailed explanations in talk on #37С3 by Kaspesrky team

https://www.youtube.com/watch?v=7VWNUUldBEE

https://usa.kaspersky.com/blog/triangulation-37c3-talk/29590/