ET MALWARE Locky Intermediate Downloader

Query · suricata

flow:to_server,established;
urilen:1;
http.method;
content:"POST";
http.user_agent;
content:"Windows-Update-Agent"; fast_pattern;
http.request_body;
pcre:"/^[\x20-\x7e\r\n]{0,20}[^\x20-\x7e\r\n]/";
http.header_names;
content:!"Referer|0d 0a|";
Raw source ET MALWARE Locky Intermediate Downloader · 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 Locky Intermediate Downloader";
    flow:to_server,established;
    urilen:1;
    http.method;
    content:"POST";
    http.user_agent;
    content:"Windows-Update-Agent"; fast_pattern;
    http.request_body;
    pcre:"/^[\x20-\x7e\r\n]{0,20}[^\x20-\x7e\r\n]/";
    http.header_names;
    content:!"Referer|0d 0a|";
    reference:md5,4f03e360be488a3811d40c113292bc01;
    classtype:trojan-activity;
    sid:2024900; rev:2;
    metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2017_10_23, deployment Perimeter, confidence High, signature_severity Major, tag Locky, updated_at 2020_08_13;
)

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.