An attacker exploits the functionality of Microsoft NTFS Alternate Data
						Streams (ADS) to underminie system security. ADS allows multiple "files" to
						be stored in one directory entry referenced as filename:streamname. One or
						more alternate data streams may be stored in any file or directory. Normal
						Microsoft utilities do not show the presence of an ADS stream attached to a
						file. The additional space for the ADS is not recorded in the displayed file
						size. The additional space for ADS is accounted for in the used space on the
						volume. An ADS can be any type of file. ADS are copied by standard Microsoft
						utilities between NTFS volumes. ADS can be used by an attacker or intruder
						to hide tools, scripts, and data from detection by normal system utilities.
						Many anti-virus programs do not check for or scan ADS. Windows Vista does
						have a switch (-R) on the command line DIR command that will display
						alternate streams.