ET MALWARE Suspected Solarwinds Serv-U Backdoor (Incoming)

Query · suricata

flow:established,to_client;
file.data;
content:"RhinoSoft";
content:"Serv-U"; distance:0;
content:"\\r\\nCRhinoUintAttr\\r\\nLastHour\\r\\n"; fast_pattern;
content:".Archive";
content:"Serv-U-Tray.exe";
content:"window.close|28 29|";
Raw source ET MALWARE Suspected Solarwinds Serv-U Backdoor (Incoming) · 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 MALWARE Suspected Solarwinds Serv-U Backdoor (Incoming)";
    flow:established,to_client;
    file.data;
    content:"RhinoSoft";
    content:"Serv-U"; distance:0;
    content:"\\r\\nCRhinoUintAttr\\r\\nLastHour\\r\\n"; fast_pattern;
    content:".Archive";
    content:"Serv-U-Tray.exe";
    content:"window.close|28 29|";
    reference:md5,2443968bb4d1c9f5e99d4dd09fd754af;
    reference:url,www.cadosecurity.com/post/triage-analysis-of-serv-u-ftp-user-backdoor-deployed-by-cve-2021-35211;
    classtype:trojan-activity;
    sid:2033321; rev:2;
    metadata:attack_target Server, created_at 2021_07_14, deployment Perimeter, performance_impact Low, confidence Medium, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2021_07_14;
)

Detection rules belong to the projects that publish them and remain under their own licenses. This site indexes and links to them; it claims no rights in them.