alert http $EXTERNAL_NET any -> $HOME_NET any (msg:"ET HUNTING SUSPICIOUS .PIF File Inside of Zip"; flow:established,from_server; file_data; content:"PK"; within:2; content:".pif"; nocase; fast_pattern; within:500; reference:md5,2e760350a5c692bd94c7c6d1233af72c; classtype:trojan-activity; sid:2018125; rev:5; metadata:created_at 2014_02_13, confidence Medium, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2019_07_26;)