alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MOBILE_MALWARE SymbOS/Yxes CnC Checkin Request"; flow:established,to_server; content:"/bs?Version="; nocase; http_uri; content:"&PhoneImei="; nocase; http_uri; content:"&PhoneImsi="; nocase; http_uri; content:"&PhoneType="; nocase; http_uri; reference:url,blog.fortinet.com/symbosyxes-or-downloading-customized-malware/; classtype:command-and-control; sid:2012845; rev:2; metadata:attack_target Mobile_Client, created_at 2011_05_25, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2019_07_26, mitre_tactic_id TA0010, mitre_tactic_name Exfiltration, mitre_technique_id T1041, mitre_technique_name Exfiltration_Over_C2_Channel;)