ET MALWARE Bitter RAT HTTP CnC Beacon

alert http $HOME_NET any -> $EXTERNAL_NET any (
    msg:"ET MALWARE Bitter RAT HTTP CnC Beacon";
    flow:established,to_server;
    threshold:type both, count 1, seconds 120, track by_src;
    http.method;
    content:"GET";
    http.uri;
    content:".php?cId="; fast_pattern;
    content:"&hos"; distance:0;
    content:"Name="; distance:0;
    content:"Info="; distance:0;
    http.header_names;
    content:!"User-Agent|0d 0a|";
    content:!"Accept";
    reference:url,blogs.forcepoint.com/security-labs/bitter-targeted-attack-against-pakistan;
    reference:md5,2b07e054a1abb2941e5e70fba652a211;
    classtype:command-and-control;
    sid:2023400; rev:3;
    metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2016_10_24, deployment Perimeter, malware_family Bitter_implant, signature_severity Major, tag c2, updated_at 2020_09_02, mitre_tactic_id TA0010, mitre_tactic_name Exfiltration, mitre_technique_id T1041, mitre_technique_name Exfiltration_Over_C2_Channel;
)