alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Iron Tiger Backdoor.GCloud CnC Beacon"; flow:established,to_server; http.uri; content:"/user?pid="; fast_pattern; content:"&data="; http.user_agent; content:"WinHTTP Example/1.0"; bsize:19; reference:url,trendmicro.com/cloud-content/us/pdfs/security-intelligence/white-papers/wp-operation-iron-tiger.pdf; classtype:command-and-control; sid:2021790; rev:4; metadata:attack_target Client_Endpoint, created_at 2015_09_17, deployment Perimeter, signature_severity Major, tag c2, updated_at 2020_10_05, mitre_tactic_id TA0010, mitre_tactic_name Exfiltration, mitre_technique_id T1041, mitre_technique_name Exfiltration_Over_C2_Channel;)