alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Win32/Upgilf CnC Beacon"; flow:established,to_server; http.method; content:"GET"; http.uri; content:"2E"; content:"2E"; distance:0; content:"2E"; distance:0; content:"00000000000000000000"; fast_pattern; pcre:"/^\/[A-F0-9]+$/"; http.user_agent; content:"Windows NT"; distance:0; http.header_names; content:!"Accept"; content:!"Referer|0d 0a|"; content:"|0d 0a|User-Agent|0d 0a|"; startswith; reference:md5,c049f2884bf2dfca9496f075216af431; classtype:command-and-control; sid:2036993; rev:4; metadata:attack_target Client_Endpoint, created_at 2016_05_05, deployment Perimeter, malware_family Win32_Upgilf, signature_severity Major, tag c2, updated_at 2020_10_06, mitre_tactic_id TA0010, mitre_tactic_name Exfiltration, mitre_technique_id T1041, mitre_technique_name Exfiltration_Over_C2_Channel;)