alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MOBILE_MALWARE SymbOS/SymGam CnC Checkin"; flow:established,to_server; content:"/ddown/getvalid.aspx"; nocase; http_uri; fast_pattern:only; reference:url,www.fortiguard.com/encyclopedia/virus/symbos_symgam.a!tr.html; classtype:command-and-control; sid:2013265; rev:2; metadata:attack_target Mobile_Client, created_at 2011_07_14, signature_severity Major, updated_at 2019_07_26, mitre_tactic_id TA0010, mitre_tactic_name Exfiltration, mitre_technique_id T1041, mitre_technique_name Exfiltration_Over_C2_Channel;)