alert http $EXTERNAL_NET any -> $HOME_NET any (msg:"ET MALWARE EVILNUM CnC Response"; flow:established,to_client; http.response_body; content:"jifhruhajsdfg444"; fast_pattern; startswith; content:"jifhruhajsdfg444"; endswith; reference:url,blog.prevailion.com/2020/05/phantom-in-command-shell5.html; classtype:command-and-control; sid:2030119; rev:1; metadata:attack_target Client_Endpoint, created_at 2020_05_06, deployment Perimeter, performance_impact Low, confidence High, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2020_05_06;)