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WhatsApp Web automation extension spam campaign targeting Brazilian users

Campaign
First reported
Last updated
Happening score
H score 33
1 unique sources, 1 articles

Summary

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A coordinated WhatsApp spam campaign used 131 rebranded Chrome extensions to automate bulk outreach against Brazilian users, creating a large-scale abuse channel that bypassed WhatsApp anti-spam controls. The extension cluster had about 20,905 active users and shared code, design patterns, and infrastructure. New uploads and updates were still appearing as recently as October 17, 2025, showing the operation remained active. The tooling was marketed as CRM software, but its practical role was to industrialize unsolicited messaging.

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Timeline

  1. 20.10.2025 13:47 2 articles · 8mo ago

    WhatsApp Web spam extension cluster receives new updates

    Technical Analysis Update

    Security researchers observed new uploads and version updates to a cluster of 131 rebranded Chrome extensions that inject into web.whatsapp.com, showing the WhatsApp Web spam operation remained active while continuing to automate bulk outreach against Brazilian users.

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  2. 20.10.2025 13:47 1 articles · 8mo ago

    Researchers disclose 131 Chrome extensions used to spam Brazilian users

    Initial Disclosure

    Cybersecurity researchers disclosed a coordinated campaign using 131 rebranded Google Chrome extensions to inject into WhatsApp Web, automate bulk outreach, and spam Brazilian users at scale; the cluster shared code, design patterns, and infrastructure and had about 20,905 active users.

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