ET RETIRED Shuckworm Backdoor Screenshot Upload Attempt

Query · suricata

flow:established,to_server;
http.method;
content:"POST";
http.uri;
content:"/index.php"; bsize:10;
http.header_names;
content:!"Referer";
content:!"User-Agent";
http.request_body;
content:"izTpDFBfSol="; fast_pattern;
content:"img=";
Raw source ET RETIRED Shuckworm Backdoor Screenshot Upload Attempt · 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 RETIRED Shuckworm Backdoor Screenshot Upload Attempt";
    flow:established,to_server;
    http.method;
    content:"POST";
    http.uri;
    content:"/index.php"; bsize:10;
    http.header_names;
    content:!"Referer";
    content:!"User-Agent";
    http.request_body;
    content:"izTpDFBfSol="; fast_pattern;
    content:"img=";
    reference:md5,4a967bbd28f5738185cf46a245918f77;
    reference:url,symantec-enterprise-blogs.security.com/blogs/threat-intelligence/russia-ukraine-shuckworm;
    classtype:trojan-activity;
    sid:2038571; rev:2;
    metadata:attack_target Client_and_Server, created_at 2022_08_19, deployment Perimeter, former_category MALWARE, malware_family Shuckworm, performance_impact Low, confidence Medium, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2024_09_17, reviewed_at 2024_09_17;
)

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