alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE SMSHoax Riskware checkin"; flow:to_server; http.method; content:"POST"; http.uri; content:"/api.php"; http.request_body; content:"YWx0X2FwaV9iYXNlX3Vy"; depth:20; reference:md5,4b779acb1a0e726cee73fc2ca8a6a0be; classtype:command-and-control; sid:2018230; rev:3; metadata:created_at 2014_03_06, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2020_04_28;)