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;)