ET MALWARE LankerBoy HTTP CnC Beacon

alert http $HOME_NET any -> $EXTERNAL_NET any (
    msg:"ET MALWARE LankerBoy HTTP CnC Beacon";
    flow:established,to_server;
    http.method;
    content:"GET";
    http.uri;
    content:".txt"; endswith;
    http.header;
    content:"User-Agent|3a 20|us|0d 0a|"; fast_pattern;
    http.header_names;
    content:!"|0d 0a|Accept";
    content:!"|0d 0a|Referer|0d 0a|";
    content:"|0d 0a|User-Agent|0d 0a|Host|0d 0a|"; startswith;
    reference:md5,db2c617a6e53a24fa887e6ecf60a076d;
    classtype:command-and-control;
    sid:2020902; rev:5;
    metadata:attack_target Client_Endpoint, created_at 2015_04_14, deployment Perimeter, signature_severity Major, tag c2, updated_at 2024_03_10, mitre_tactic_id TA0010, mitre_tactic_name Exfiltration, mitre_technique_id T1041, mitre_technique_name Exfiltration_Over_C2_Channel;
)