alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET POLICY Ryeol HTTP Client Class "; flow:established,to_server; http.user_agent; content:"Ryeol HTTP Client Class"; reference:url,trustwave.azureedge.net/media/16929/the-golden-tax-department-and-emergence-of-goldenspy-malware.pdf; reference:url,github.com/Leo2016/luaTestTool/tree/master/luaTestTool/3rdTools/ryeolhttpclient_src; classtype:misc-activity; sid:2013387; rev:7; metadata:attack_target Client_Endpoint, created_at 2011_08_10, deployment Perimeter, performance_impact Low, confidence High, signature_severity Informational, updated_at 2023_05_17;)