alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Win32/Radonskra.B C2 Check-in"; flow:established,to_server; http.uri; content:".php?"; nocase; content:"&os=Windows"; nocase; content:"&mac="; nocase; content:"&lua="; nocase; content:"&firewall="; nocase; content:"&antivirus="; nocase; content:"&antispyware"; nocase; http.header_names; content:!"Referer|0d 0a|"; content:!"Accept"; reference:md5,9d6b99e87faa3f7a23adef5031bd598b; reference:url,www.microsoft.com/security/portal/threat/encyclopedia/Entry.aspx?Name=Trojan%3aWin32%2fRadonskra.B; classtype:command-and-control; sid:2023033; rev:3; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2016_08_09, deployment Perimeter, malware_family Win32_Radonskra_B, performance_impact Low, signature_severity Major, updated_at 2020_07_27;)