Hackers Exploit CSS Properties to Conceal Malicious Code in Hidden Text Salting Attacks

In a sophisticated evolution of email-based attacks, adversaries have begun leveraging Cascading Style Sheets (CSS) to inject hidden “salt” — irrelevant content used to confuse detection systems — deep within HTML emails. Cisco Talos’s year-long monitoring (March 1, 2024 – July 31, 2025) reveals a marked increase in the abuse of CSS properties to conceal […]

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