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Massive AdGholas Malvertising Campaigns Use Steganography and File Whitelisting to Hide in Plain Sight | Proofpoint
Proofpoint published a very interesting in-depth analysis of a big malvertising network that they found in the wild and that hid itself from plain sight by using steganography and file whitelisting. There’s evidence that they targeted a daily traffic of 1-5 million high-quality client hits.