ET MALWARE Possible Fake AV Checkin

Query · suricata

flow:established,to_server;
http.method;
content:"POST"; nocase;
http.uri;
content:".php";
http.user_agent;
content:"Mozilla/4.0 (compatible|3b 20|MSIE 6.0|3b 20|Windows NT 5.0)"; endswith;
http.request_body;
content:"data="; fast_pattern; depth:5;
pcre:"/^data=[a-zA-Z0-9+\/]{64}/";
http.header_names;
content:!"Referer";
Raw source ET MALWARE Possible Fake AV Checkin · Suricata
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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 Possible Fake AV Checkin";
    flow:established,to_server;
    http.method;
    content:"POST"; nocase;
    http.uri;
    content:".php";
    http.user_agent;
    content:"Mozilla/4.0 (compatible|3b 20|MSIE 6.0|3b 20|Windows NT 5.0)"; endswith;
    http.request_body;
    content:"data="; fast_pattern; depth:5;
    pcre:"/^data=[a-zA-Z0-9+\/]{64}/";
    http.header_names;
    content:!"Referer";
    classtype:command-and-control;
    sid:2011912; rev:9;
    metadata:created_at 2010_11_09, confidence Medium, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2020_09_15;
)

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