ET MALWARE Win32.Rioselx.A Checkin

Query · suricata

flow:established,to_server;
http.uri;
content:"/access.php"; fast_pattern;
http.user_agent;
content:!"Mozilla"; within:7;
pcre:"/^(?:[A-Za-z0-9+/]{4})*(?:[A-Za-z0-9+/]{2}==|[A-Za-z0-9+/]{3}=|[A-Za-z0-9+/]{4})/";
http.content_type;
content:"application/x-www-form-urlencoded"; startswith;
http.header_names;
content:!"Referer";
content:!"Accept";
content:"Content-Length|0d 0a|";
Raw source ET MALWARE Win32.Rioselx.A Checkin · Suricata
Esc
Published by Emerging Threats Open ↗, licensed under BSD 3-Clause ↗. Line breaks added for readability; the rule is otherwise unchanged. 
alert http $HOME_NET any -> $EXTERNAL_NET any (
    msg:"ET MALWARE Win32.Rioselx.A Checkin";
    flow:established,to_server;
    http.uri;
    content:"/access.php"; fast_pattern;
    http.user_agent;
    content:!"Mozilla"; within:7;
    pcre:"/^(?:[A-Za-z0-9+/]{4})*(?:[A-Za-z0-9+/]{2}==|[A-Za-z0-9+/]{3}=|[A-Za-z0-9+/]{4})/";
    http.content_type;
    content:"application/x-www-form-urlencoded"; startswith;
    http.header_names;
    content:!"Referer";
    content:!"Accept";
    content:"Content-Length|0d 0a|";
    reference:md5,3eb94c397a395f24b84297593f69710a;
    classtype:command-and-control;
    sid:2021442; rev:6;
    metadata:created_at 2015_07_20, signature_severity Major, updated_at 2020_05_29;
)

Detection rules belong to the projects that publish them and remain under their own licenses. This site indexes and links to them; it claims no rights in them.