Windows Command Line - Hiding a file or virus
attrib Attribute
h --> hidden
r --> read only
s --> system attribute
+/- --> set/clear
attrib +h Test.txt
attrib -h Test.txt
attrib +r Test.txt
attrib -r Test.txt
attrib +s Test.txt
attrib -s Test.txt
attrib +h +r +s Test.txt #You can not find it anymore.
attrib -h -r -s Test.txt