alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MOBILE_MALWARE Android/Geost CnC Checkin"; flow:established,to_server; http.method; content:"GET"; http.uri; content:"/geost.php?bid="; fast_pattern; classtype:command-and-control; sid:2028661; rev:1; metadata:affected_product Android, attack_target Mobile_Client, created_at 2019_10_08, deployment Perimeter, malware_family Geost, confidence High, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2019_10_08, mitre_tactic_id TA0010, mitre_tactic_name Exfiltration, mitre_technique_id T1041, mitre_technique_name Exfiltration_Over_C2_Channel;)