alert http $HOME_NET any -> $EXTERNAL_NET any (
msg:"ET MOBILE_MALWARE APT33/Charming Kitten Android/LittleLooter Activity (POST) M3";
flow:established,to_server;
http.request_line;
content:"POST|20|/|20|HTTP/1.1";
http.user_agent;
content:"|3b 20|Android|20|";
http.host;
content:".xyz"; endswith;
http.request_body;
content:"s="; startswith;
content:"&gfu="; distance:0; fast_pattern;
http.header_names;
content:!"Referer";
reference:url,threatpost.com/black-hat-charming-kitten-opsec-goofs-training-videos/168394/;
reference:md5,a04c2c3388da643ef67504ef8c6907fb;
classtype:command-and-control;
sid:2033688; rev:1;
metadata:attack_target Mobile_Client, created_at 2021_08_09, deployment Perimeter, confidence High, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2021_08_09;
)