alert http $EXTERNAL_NET any -> $HOME_NET any (msg:"ET POLICY ASProtect/ASPack Packed Binary"; flow:from_server,established; flowbits:isnotset,ET.http.binary; content:"|2E 61 73 70 61 63 6B|"; file_data; content:"MZ"; within:2; byte_jump:4,58,relative,little; content:"PE|00 00|"; distance:-64; within:4; flowbits:set,ET.http.binary; reference:url,www.aspack.com/downloads.aspx; reference:url,bits.packetninjas.org/eblog; classtype:misc-activity; sid:2008575; rev:6; metadata:created_at 2010_07_30, deployment Perimeter, confidence High, signature_severity Informational, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2023_05_08;)