ET MALWARE Backdoor family PCRat/Gh0st CnC traffic (OUTBOUND) 21

alert tcp $HOME_NET any -> $EXTERNAL_NET !5800 (
    msg:"ET MALWARE Backdoor family PCRat/Gh0st CnC traffic (OUTBOUND) 21";
    flow:established,to_server;
    stream_size:server,<,5;
    dsize:>11;
    content:"|70 94|"; offset:8;
    byte_jump:4,-10,relative,little,from_beginning,post_offset -1;
    isdataat:!2,relative;
    pcre:"/^.{8}\x70\x94[\x20-\x7e]/s";
    reference:url,www.securelist.com/en/descriptions/10155706/Trojan-GameThief.Win32.Magania.eogz;
    reference:url,www.microsoft.com/security/portal/Threat/Encyclopedia/Entry.aspx?Name=Backdoor%3AWin32%2FPcClient.ZR&ThreatID=-2147325231;
    reference:md5,3ae76f6b76e743fd8063e1831236ce24;
    classtype:command-and-control;
    sid:2018057; rev:5;
    metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2014_02_03, deployment Perimeter, malware_family Gh0st, malware_family PCRAT, performance_impact Significant, confidence Medium, signature_severity Critical, tag PCRAT, tag Gh0st, tag RAT, updated_at 2021_09_09;
)