alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MOBILE_MALWARE Suspected SandCat Related CnC"; flow:established,to_server; http.method; content:"POST"; http.uri; content:"/socket.io/?EIO="; depth:16; content:"&transport=polling"; endswith; http.request_body; content:"|5b 22|add|20|user|22|,|22|ID_"; offset:5; fast_pattern; http.header_names; content:!"Referer|0d 0a|"; reference:md5,eeecfa2999aea400deb8029d27db125e; classtype:command-and-control; sid:2029619; rev:4; metadata:attack_target Client_Endpoint, created_at 2020_03_12, deployment Perimeter, performance_impact Low, confidence Medium, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2023_06_12;)