Invisible intrusions exploit core telecom vulnerabilities globally,

silently transforming mobile devices into tracking beacons.

Research initiated from anomalous signaling firewall alerts,

enhanced by collaborative data from specialized security entities.

Through deep analysis of signaling pathways and infrastructure mapping,

concrete links emerged connecting malicious actions to live operator systems.

Two distinct threat groups, designated STA1 and STA2, are highlighted,

associated with private surveillance firms serving state-level interests.

STA1 represents a persistent, sophisticated campaign,

leveraging both legacy and modern signaling protocols for precise geo-location.

A documented incident involved a prominent individual being monitored,

with the attacker dynamically shifting across fabricated operator profiles in multiple nations.

This entity continuously altered methods and protocols,

evading defensive measures to successfully harvest location intelligence.

A sophisticated campaign has been discovered that conceals its origins by altering signaling identifiers and routing techniques.

Networks associated with various telecom operators, including 019mobile from Israel, Tango Networks in the UK, and Airtel in Jersey, were used as gateways or transit points for this operation.

According to Citizen Lab, these networks likely experienced exploitation through third-party access or spoofing, rather than being directly complicit in the spying activities.

Analysis of historical data indicates that this type of tracking behavior has been occurring since at least 2022, revealing hundreds of attempts connected to the same network infrastructure.

A novel methodology known as STA2 is employed in a covert telecom surveillance initiative, merging signaling exploits with device vulnerabilities. In early 2025, experts detected a malicious SMS containing concealed SIM Toolkit (STK) instructions aimed at manipulating the S@T browser, an outdated SIM function. This technique, reminiscent of the “Simjacker” attack, permits covert retrieval of users' location details without their knowledge.

The manipulated SMS is crafted with particular headers enabling processing directly by the SIM card, thus remaining invisible to the recipient. Once activated, it gathers information about nearby cell towers and transmits it surreptitiously back to systems controlled by the attackers. This sequence of attacks also incorporated SS7 probing and diameter queries, highlighting a sophisticated multi-layered surveillance operation.

The Citizen Lab has traced STA2 to an extensive campaign that has made over 15,000 attempts at location tracking since 2022. The activities bear a resemblance to the infrastructures and behavior previously linked to Fink Telecom Services (FTS) in Switzerland, a company previously implicated in telecom surveillance efforts.

These surveillance tactics do not depend on malware installation or the compromise of devices. Instead, they exploit inherent vulnerabilities within the telecom infrastructure. SS7 protocol lacks adequate authentication mechanisms, and the security aspects of the Diameter protocol are frequently not implemented effectively. This allows attackers to masquerade as legitimate operators, funnel malicious requests through genuine service providers, and intermingle surveillance data with standard roaming activities.

Citizen Lab cautions that the overall global telecom framework remains inherently susceptible due to its dependence on trust-based interconnections and lax governance regarding third-party access. Without the implementation of more robust validation processes, enhanced cybersecurity measures, and stringent regulatory frameworks, these networks will likely continue to facilitate clandestine surveillance efforts across the globe.

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