ET MALWARE Win32/TrojanDownloader.Delf.BXC CnC Beacon

alert http $HOME_NET any -> $EXTERNAL_NET any (
    msg:"ET MALWARE Win32/TrojanDownloader.Delf.BXC CnC Beacon";
    flow:established,to_server;
    http.method;
    content:"GET";
    http.uri;
    content:".php?cg="; fast_pattern;
    content:"&b="; distance:0;
    content:"&gt="; distance:0;
    http.header_names;
    content:!"Referer|0d 0a|";
    reference:md5,d199b13d4676080073eaeb4e0ff39a75;
    reference:url,securelist.com/blog/research/76717/inpage-zero-day-exploit-used-to-attack-financial-institutions-in-asia/;
    classtype:command-and-control;
    sid:2023546; rev:3;
    metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2016_11_23, deployment Perimeter, malware_family Win32_TrojanDownloader_Delf_BXC, signature_severity Major, tag c2, updated_at 2020_08_03, mitre_tactic_id TA0010, mitre_tactic_name Exfiltration, mitre_technique_id T1041, mitre_technique_name Exfiltration_Over_C2_Channel;
)