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Browser Extensions Turn Nearly 1 Million Browsers Into Website-Scraping Bots

GLOBAL, JUL 8 – The campaign uses poisoned search results and fake sites to deliver backdoor malware to IT professionals, with 2.3 million browser infections linked to malicious extensions, researchers say.

  • Researchers discovered 245 browser extensions installed on almost one million devices that covertly convert browsers into web-scraping bots without user consent.
  • These extensions incorporate a JavaScript library connected to Olostep, a company that offers a robust web scraping service capable of circumventing anti-bot measures and executing as many as 100,000 simultaneous requests.
  • The extensions disable key security protections by stripping web headers and injecting hidden iframes, driving paid scraping operations for clients including advertisers.
  • Malicious extensions have been downloaded 1.7 million times, with developers receiving 55 percent of revenue and MellowTel pocketing the rest, while some flagged extensions were removed but many remain active.
  • Researchers warned these activities expose users to privacy and security risks, and advised removing malicious extensions, clearing browsing data, and scanning systems with antivirus software.
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cybernoz.com broke the news in on Tuesday, July 8, 2025.
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