During an internal investigation at a healthcare billing firm in Denver, Colorado, the security team analyzes suspicious activity involving a senior accountant’s corporate smartphone. The user reports that the device behaved normally and that no links were clicked or applications installed during the timeframe in question.
Telecom monitoring reveals that the device received several binary-formatted SMS messages shortly before the incident. These messages were not visible in the messaging application. Within minutes of receiving them, the phone began transmitting cellular location identifiers and device-related data to an unfamiliar external system. The transmissions occurred automatically and did not require any user interaction.
Which mobile attack technique most accurately explains this behavior?
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