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TechRadar
TechRadar
Sead Fadilpašić

'Unfortunately, it needs to be said: Do not send a text to confirm you are human': Experts reveal how fake CAPTCHAs are driving a global SMS scam campaign

Infoblox
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  • Infoblox researchers expose long‑running CAPTCHA scam that tricks victims into sending costly international SMS messages
  • Victims can unknowingly send dozens of texts, incurring charges while attackers profit through telecom revenue sharing
  • The defense is simple: never send a text message to “prove you are human”

Fake CAPTCHAs are not just about copying and pasting links to malware - they can also be about sending an SMS to an international number and being charged a whole lot for the privilege.

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