alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Common RAT Connectivity Check Observed"; flow:to_server,established; urilen:6; http.user_agent; content:"Mozilla/5.0 (Windows NT 6.3|3b 20|rv|3a|48.0) Gecko/20100101 Firefox/48.0"; depth:65; http.host; content:"ip-api.com"; depth:10; endswith; http.request_line; content:"GET /json/"; depth:10; fast_pattern; http.connection; content:"Keep-Alive"; depth:10; endswith; http.header_names; content:"|0d 0a|User-Agent|0d 0a|Host|0d 0a|Connection|0d 0a 0d 0a|"; depth:34; endswith; reference:md5,69aeb53d5d8792e5479966aeed917bc4; classtype:trojan-activity; sid:2036383; rev:5; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2016_12_07, deployment Perimeter, malware_family Qasar_Rat, malware_family AZORult, malware_family VoidRat, confidence High, signature_severity Major, updated_at 2020_11_11;)