ET WEB_SERVER Win32/SessionManager2 Backdoor S5CLOSE Command (Inbound)

Query · suricata

flow:established,to_server;
http.cookie;
content:"SM_SESSION=S5CLOSE|3b|"; fast_pattern;
threshold:type limit, track by_src, count 1, seconds 120;
Raw source ET WEB_SERVER Win32/SessionManager2 Backdoor S5CLOSE Command (Inbound) · 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 Win32/SessionManager2 Backdoor S5CLOSE Command (Inbound)";
    flow:established,to_server;
    http.cookie;
    content:"SM_SESSION=S5CLOSE|3b|"; fast_pattern;
    threshold:type limit, track by_src, count 1, seconds 120;
    reference:url,securelist.com/the-sessionmanager-iis-backdoor/106868/;
    classtype:trojan-activity;
    sid:2037228; rev:2;
    metadata:attack_target Web_Server, created_at 2022_06_30, deployment Perimeter, malware_family SessionManager, confidence High, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2023_05_11, reviewed_at 2024_01_08;
)

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