alert http $HOME_NET any -> $EXTERNAL_NET any (
msg:"ET MOBILE_MALWARE Android Joker CnC Configuration Retrieval";
flow:established,to_server;
http.method;
content:"GET";
http.uri;
content:"/api/ckwkc2?icc="; startswith; fast_pattern;
http.user_agent;
content:"(Linux|3b 20|U|3b 20|Android";
http.header_names;
content:!"Referer";
reference:url,research.checkpoint.com/2020/android-app-fraud-haken-clicker-and-joker-premium-dialer/;
classtype:command-and-control;
sid:2030849; rev:2;
metadata:attack_target Mobile_Client, created_at 2020_09_08, deployment Perimeter, performance_impact Low, confidence High, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2020_09_08;
)