There is a common technique used by attackers: They append some data at the end of files (this is called an overlay). This can be used for two main reasons: To hide the appended data from the operating system (steganography). By example, you can append a text file at the end of a JPEG image. When your favourite image viewer will process the picture, it will just ignore the “rogue” data. Here is a PNG picture that has a text file (dir output) added at the end:
Article Link: Managing PE Files With Overlays – SANS Internet Storm Center
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There is a common technique used by attackers: They append some data at the end of files (this is called an overlay). This can be used for two main reasons: To hide the appended data from the operating system (steganography). By example, you can append a text file at the end of a JPEG image. When your favourite image viewer will process the picture, it will just ignore the “rogue” data. Here is a PNG picture that has a text file (dir output) added at the end:
Article Link: Managing PE Files With Overlays – SANS Internet Storm Center
1 post – 1 participant
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