alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Sysget/HelloBridge HTTP GET CnC Beacon"; flow:established,to_server; http.method; content:"GET"; http.uri; content:".php?fn="; fast_pattern; pcre:"/&(?:uid|name|file)=[a-f0-9]+$/"; http.header_names; content:!"Accept"; content:!"Referer|0d 0a|"; reference:url,researchcenter.paloaltonetworks.com/2015/04/unit-42-identifies-new-dragonok-backdoor-malware-deployed-against-japanese-targets/; classtype:command-and-control; sid:2020921; rev:4; metadata:attack_target Client_Endpoint, created_at 2015_04_16, deployment Perimeter, signature_severity Major, tag c2, updated_at 2020_09_30, mitre_tactic_id TA0010, mitre_tactic_name Exfiltration, mitre_technique_id T1041, mitre_technique_name Exfiltration_Over_C2_Channel;)