Because base64 converts from an 8 bit to a 6 bit character system, you can get 3 unique base64 strings from a single ascii string depending on the position of the first character.
for example:
base64_encode("system");
base64_encode(" system");
base64_encode("( system");
The above 3 input strings all produce very different base64 signatures even though they all contain the same keyword 'system'. This is because the first letter of system, 's' fall on indices 0,1,2 respectively.
I updated several of the base64 samples to include their offset counterparts as the originals would only catch about 1 in 3 of the actual present matches.
Added Extra Patterns for scanning from samples i found on my server.
Added extra-check it checks for googlebot and htaccess useful for cleaning up left over files.
