ET MALWARE IceRat Backdoor Checkin

Query · suricata

flow:established,to_server;
http.request_line;
content:"GET /users.php?"; startswith; fast_pattern;
pcre:"/^(?:resp|onl|pr)=/R";
content:"|3a|windows|20|"; distance:0;
Raw source ET MALWARE IceRat Backdoor 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 IceRat Backdoor Checkin";
    flow:established,to_server;
    http.request_line;
    content:"GET /users.php?"; startswith; fast_pattern;
    pcre:"/^(?:resp|onl|pr)=/R";
    content:"|3a|windows|20|"; distance:0;
    reference:url,www.gdatasoftware.com/blog/icerat-evades-antivirus-by-using-jphp;
    reference:md5,dae90ae7fe103fc7e1866b4e13389101;
    classtype:command-and-control;
    sid:2031486; rev:1;
    metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2021_01_06, deployment Perimeter, malware_family IceRAT, confidence High, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2021_01_06;
)

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