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'Dirty zipping' is the method of using SFX archives (A self-extracting archive type) to 'disguise' a file such as a malicious payload within a medium such as an image through a roundabout form of steganography which results in a 'Dirty zip'. When the victim of a dirty zip attack opens a seemingly harmless file (the image in this example) they'll be shown the image but in the background a payload will execute. This method can be achieved through software's such as WinRar and 7Zip.
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