how can we perform detection by signature of snort

[bz Os via Snort-sigs <snort-sigs () lists snort org>]

   I am using snort with pulledpork as rules i am using ET open and vrt
,when i am testing snort against pytbull i have any detection,when i
researched in the rules i dont find those rule who are responsible for
generating alert .
pleaz can any one help me to perform detection of snort

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