ET MALWARE MICROPSIA CnC Checkin

alert http $HOME_NET any -> $EXTERNAL_NET any (
    msg:"ET MALWARE MICROPSIA CnC Checkin";
    flow:established,to_server;
    http.method;
    content:"POST";
    http.uri;
    content:!".";
    content:!"&";
    http.user_agent;
    content:"Mozilla/5.0 (compatible|3b 20|Googlebot/2.1|3b 20|+http|3a 2f 2f|www.google|2e|com/bot.html)"; bsize:72;
    http.request_body;
    content:"="; depth:25;
    content:"&"; distance:0;
    content:"="; distance:0; within:25;
    content:"=V2luZG93cy"; distance:0; fast_pattern;
    http.header_names;
    content:!"Referer";
    reference:url,unit42.paloaltonetworks.com/pymicropsia/;
    classtype:trojan-activity;
    sid:2031371; rev:1;
    metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2020_12_14, deployment Perimeter, confidence High, signature_severity Major, updated_at 2020_12_14;
)