alert http $EXTERNAL_NET any -> $HOME_NET any (msg:"ET ADWARE_PUP Possible FakeAV Binary Download"; flow:established,to_client; http.header; content:"filename=|22|"; nocase; content:"antiv"; fast_pattern; nocase; within:50; pcre:"/filename\x3D\x22[^\r\n]*antiv[^\n]+\.exe/i"; classtype:pup-activity; sid:2012753; rev:8; metadata:created_at 2011_04_29, confidence Medium, signature_severity Minor, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2020_08_31;)