ET MALWARE BUILDINGCAN CnC Activity

alert http $HOME_NET any -> $EXTERNAL_NET any (
    msg:"ET MALWARE BUILDINGCAN CnC Activity";
    flow:established,to_server;
    http.method;
    content:"POST";
    http.user_agent; bsize:69;
    content:"Mozilla/5.0 (Windows NT 6.1|3b 20|WOW64) Chrome/28.0.1500.95 Safari/537.36"; fast_pattern;
    http.content_type; bsize:33;
    content:"application/x-www-form-urlencoded";
    http.request_body;
    content:"id="; startswith;
    pcre:"/(?:&(?:boardid|bbsNo|strBoardID|userid|bbs|filename|code|pid|seqNo|ReportID|v|PageNumber|num|view|read|action|page|mode|idx|cateId|bbsId|pType|pcode|index|tbl|idx_num|act|bbs_id|bbs_form|bid|bbscate|menu|tcode|b_code|bname|tb|borad01|borad02|borad03|mid|newsid|table|Board_seq|bc_idx|seq|ArticleID|B_Notice|nowPage|webid|boardDiv|sub_idxa)=[^&]+){3}$/R";
    reference:url,blogs.jpcert.or.jp/en/2020/09/BLINDINGCAN.html;
    classtype:targeted-activity;
    sid:2030932; rev:1;
    metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2020_09_30, deployment Perimeter, deployment SSLDecrypt, performance_impact Moderate, confidence High, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2020_09_30;
)