Abstract
One of the most effective hiding places for a hacker to hide their malicious files in your operating system, be it for Trojans or worms, is inside a hidden file which is linked to a normal file or directory using a stream. Known as Alternate Data Streams (ADS), they are a feature of operating systems such as Windows NT and XP, and are undocumented as far as their security risk is concerned. There is no limit in size and many streams can be linked to a single file. Is this a hacker's dream come true? And how worried should you be? Alternate Data Streams allow data to be stored inside hidden files, which are linked to a normal file or directory using a stream. They are one of the most effective hiding places for a hacker to store their malicious files. Read on.
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