alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET HUNTING PNG in HTTP POST (Outbound)"; flow:established,to_server; http.method; content:"POST"; http.request_body; content:"|89 50 4E 47 0D 0A 1A 0A|"; content:"IHDR"; distance:0; reference:md5,71d5aea26377d283b4216bdbb6558ad0; classtype:trojan-activity; sid:2039097; rev:1; metadata:attack_target Client_Endpoint, created_at 2022_10_05, deployment Perimeter, deployment SSLDecrypt, confidence Medium, signature_severity Informational, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2022_10_05;)