Formbook phishing campaign using DLL sideloading and obfuscated JavaScript
Campaign
Summary
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The Formbook phishing operation is targeting Windows organizations across Greece, Spain, Slovenia, Bosnia, Croatia and South America, using DLL sideloading and obfuscated JavaScript to deliver credential-stealing malware. The activity matters because Formbook can capture login credentials, browser data, and screenshots while trying to evade detection. The campaigns show two separate infection paths, increasing the odds that recipients who open the lures will be compromised.
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Timeline
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20.04.2026 18:01 2 articles · 1mo ago
WatchGuard discloses Formbook phishing campaigns
Initial DisclosureWatchGuard disclosed at least two phishing campaigns targeting organizations on Microsoft Windows, with one delivery chain using DLL sideloading and another using obfuscated JavaScript to install Formbook. The lures were seen targeting companies in Greece, Spain, Slovenia, Bosnia, Croatia, and parts of South America, and the malware is designed to collect login credentials, browser data, and screenshots while evading detection.
Show sources
- Formbook Malware Campaign Uses Multiple Obfuscation Techniques to Avoid Detection — www.infosecurity-magazine.com — 20.04.2026 18:01
- Formbook Malware Campaign Uses Multiple Obfuscation Techniques to Avoid Detection — www.infosecurity-magazine.com — 20.04.2026 18:01