"A veteran strain of ransomware called Reveton has mutated once again and is now infecting Windows PCs in the United States and abroad by disguising itself as Windows library, or DLL, files, in order to better escape the notice of victims.":
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www.foxnews.com/tech/201 ··· -tricks/Hackers are very skilled at modifying their creations (not a good thing for the rest of us).