ET MALWARE Win32/Grandoreiro TCP CnC Activity

Query · suricata

flow:established,to_server;
stream_size:server,<,5;
content:"/GET|20|"; startswith; fast_pattern;
content:"|0d 0a|HOST|3a 20|"; distance:0; nocase;
pcre:"/^\/GET\s[A-F0-9]{30,400}\sHTTP\/1\.1\r\nH[Oo][Ss][Tt]\x3a\x20[^\r\n]+[\r\n]+$/";
target:src_ip;
Raw source ET MALWARE Win32/Grandoreiro TCP CnC Activity · Suricata
Esc
Published by Emerging Threats Open ↗, licensed under BSD 3-Clause ↗. Line breaks added for readability; the rule is otherwise unchanged. 
alert tcp-pkt $HOME_NET any -> $EXTERNAL_NET any (
    msg:"ET MALWARE Win32/Grandoreiro TCP CnC Activity";
    flow:established,to_server;
    stream_size:server,<,5;
    content:"/GET|20|"; startswith; fast_pattern;
    content:"|0d 0a|HOST|3a 20|"; distance:0; nocase;
    pcre:"/^\/GET\s[A-F0-9]{30,400}\sHTTP\/1\.1\r\nH[Oo][Ss][Tt]\x3a\x20[^\r\n]+[\r\n]+$/";
    reference:md5,0f3f51ba3377fe7b270c92dd7ea26bd8;
    reference:url,app.any.run/tasks/333283ad-217d-4095-89b6-6d4810341882/;
    classtype:trojan-activity;
    sid:2044346; rev:1;
    metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2023_02_27, deployment Perimeter, malware_family Grandoreiro, performance_impact Low, confidence High, signature_severity Major, tag RAT, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2023_02_27;
    target:src_ip;
)

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