ET MALWARE APT Related CR4T Dropper Activity M2 (GET)

Query · suricata

flow:established,to_server;
urilen:<20;
http.method;
content:"GET";
http.uri;
content:"/inst"; startswith; fast_pattern;
content:".xml"; endswith;
http.user_agent;
pcre:"/^[A-Za-z]{23}$/";
http.header_names;
content:"|0d 0a|User-Agent|0d 0a|Host|0d 0a|Cache-Control|0d 0a 0d 0a|"; bsize:37;
target:src_ip;
Raw source ET MALWARE APT Related CR4T Dropper Activity M2 (GET) · 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 -> $EXTERNAL_NET any (
    msg:"ET MALWARE APT Related CR4T Dropper Activity M2 (GET)";
    flow:established,to_server;
    urilen:<20;
    http.method;
    content:"GET";
    http.uri;
    content:"/inst"; startswith; fast_pattern;
    content:".xml"; endswith;
    http.user_agent;
    pcre:"/^[A-Za-z]{23}$/";
    http.header_names;
    content:"|0d 0a|User-Agent|0d 0a|Host|0d 0a|Cache-Control|0d 0a 0d 0a|"; bsize:37;
    reference:md5,48c8e8cc189eef04a55ecb021f9e6111;
    reference:md5,9d20cc7a02121b515fd8f16b576624ef;
    reference:url,securelist.com/dunequixote/112425/;
    classtype:trojan-activity;
    sid:2052241; rev:1;
    metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, affected_product Windows_11, attack_target Client_Endpoint, tls_state TLSDecrypt, created_at 2024_04_23, deployment Perimeter, deployment SSLDecrypt, confidence High, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2024_04_23;
    target:src_ip;
)

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