If many malware samples try to be “filess” (read: they try to reduce their filesystem footprint to the bare minimum), another technique remains interesting: Alternate Data Streams or “ADS”[1]. This NTFS feature allows files to contain multiple data streams, enabling hidden or additional metadata to be stored alongside the main file content without being visible in standard file listings. A common usage of ADS is the “Mark of the Web”[2] that helps to flag files as suspicious or not depending on their origin.
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