ET MALWARE TA450 Nagual CnC Activity

Query · suricata

flow:established,to_server;
urilen:<50;
http.method;
content:"POST";
http.uri;
pcre:"/^\/[a-z]+/";
http.content_type;
content:"application/x-www-form-urlencoded"; bsize:33;
http.header;
content:"CharSet|3a 20|UTF-8|0d 0a|"; fast_pattern;
http.request_body;
content:"vl="; startswith;
pcre:"/^[0-9D]+$/R";
Raw source ET MALWARE TA450 Nagual CnC Activity · 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 -> $EXTERNAL_NET any (
    msg:"ET MALWARE TA450 Nagual CnC Activity";
    flow:established,to_server;
    urilen:<50;
    http.method;
    content:"POST";
    http.uri;
    pcre:"/^\/[a-z]+/";
    http.content_type;
    content:"application/x-www-form-urlencoded"; bsize:33;
    http.header;
    content:"CharSet|3a 20|UTF-8|0d 0a|"; fast_pattern;
    http.request_body;
    content:"vl="; startswith;
    pcre:"/^[0-9D]+$/R";
    reference:md5,b0ab12a5a4c232c902cdeba421872c37;
    classtype:command-and-control;
    sid:2034325; rev:1;
    metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2021_11_02, deployment Perimeter, performance_impact Moderate, confidence High, signature_severity Major, tag TA450, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2021_11_02;
)

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