ET MALWARE EvilNum CnC Checkin

Query · suricata

flow:established,to_server;
http.method;
content:"GET";
http.uri;
content:"/Validate/valsrv"; bsize:16; fast_pattern;
http.header_names;
content:"Host|0d 0a|Connection|0d 0a 0d 0a|";
content:!"User-Agent";
content:!"Referer";
content:!"Accept-";
Raw source ET MALWARE EvilNum CnC 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 EvilNum CnC Checkin";
    flow:established,to_server;
    http.method;
    content:"GET";
    http.uri;
    content:"/Validate/valsrv"; bsize:16; fast_pattern;
    http.header_names;
    content:"Host|0d 0a|Connection|0d 0a 0d 0a|";
    content:!"User-Agent";
    content:!"Referer";
    content:!"Accept-";
    reference:md5,0823457bcb82afff15c900f949e325f4;
    reference:url,www.welivesecurity.com/2020/07/09/more-evil-deep-look-evilnum-toolset/;
    classtype:command-and-control;
    sid:2030526; rev:1;
    metadata:attack_target Client_Endpoint, created_at 2020_07_15, deployment Perimeter, performance_impact Low, confidence High, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2020_07_15;
)

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