ET WEB_SERVER Suspected SUPERNOVA Webshell Command (External)

Query · suricata

flow:established,to_server;
http.method;
content:"POST";
http.uri;
content:"/Orion/logoimagehandler.ashx"; bsize:28; fast_pattern;
http.user_agent;
content:"python-requests/"; startswith; nocase;
Raw source ET WEB_SERVER Suspected SUPERNOVA Webshell Command (External) · Suricata
Esc
Published by Emerging Threats Open ↗, licensed under BSD 3-Clause ↗. Line breaks added for readability; the rule is otherwise unchanged. 
alert http $EXTERNAL_NET any -> $HOME_NET any (
    msg:"ET WEB_SERVER Suspected SUPERNOVA Webshell Command (External)";
    flow:established,to_server;
    http.method;
    content:"POST";
    http.uri;
    content:"/Orion/logoimagehandler.ashx"; bsize:28; fast_pattern;
    http.user_agent;
    content:"python-requests/"; startswith; nocase;
    reference:url,www.secureworks.com/blog/supernova-web-shell-deployment-linked-to-spiral-threat-group;
    classtype:attempted-admin;
    sid:2031879; rev:1;
    metadata:attack_target Server, created_at 2021_03_09, deployment Perimeter, deployment SSLDecrypt, performance_impact Low, confidence Medium, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2021_03_09;
)

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