Sturnus Malware Hijacks Signal and WhatsApp, Taking Full Device Control

Gbhackers •Mayura Kathir • November 20, 2025

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WhatsApp Security Flaw Exposes 3.5 Billion Phone Numbers A security flaw in WhatsApp allowed researchers to extract phone numbers of 3.5 billion users. The exploit involved systematically checking numbers through the app's discovery feature, revealing profile photos for 57% and profile text for 29% of accounts. Meta was alerted to the vulnerability in April 2025 and implemented stricter rate-limiting by October 2025. 56 sources 38

Sturnus Malware Hijacks Signal and WhatsApp, Taking Full Device Control

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