ET MALWARE SmartLoader CnC Activity

Query · suricata

flow:established,to_server;
urilen:>47;
http.method;
content:"PUT";
http.uri;
content:"/loader/"; startswith; fast_pattern;
pcre:"/^(?:[a-zA-Z0-9]{40,43})$/R";
http.host;
pcre:"/^(?:[0-9]{1,3}\.){3}[0-9]{1,3}$/";
http.request_body;
content:"|7b 22|data|22 3a 20|"; startswith;
http.content_type;
content:"application/json"; bsize:16;
http.header_names;
content:!"Referer|0d 0a|";
Raw source ET MALWARE SmartLoader 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 http $HOME_NET any -> $EXTERNAL_NET any (
    msg:"ET MALWARE SmartLoader CnC Activity";
    flow:established,to_server;
    urilen:>47;
    http.method;
    content:"PUT";
    http.uri;
    content:"/loader/"; startswith; fast_pattern;
    pcre:"/^(?:[a-zA-Z0-9]{40,43})$/R";
    http.host;
    pcre:"/^(?:[0-9]{1,3}\.){3}[0-9]{1,3}$/";
    http.request_body;
    content:"|7b 22|data|22 3a 20|"; startswith;
    http.content_type;
    content:"application/json"; bsize:16;
    http.header_names;
    content:!"Referer|0d 0a|";
    reference:url,community.emergingthreats.net/t/smartloader/1428;
    classtype:trojan-activity;
    sid:2051456; rev:1;
    metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, tls_state plaintext, created_at 2024_03_04, deployment Perimeter, malware_family SmartLoader, confidence Medium, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2024_03_04;
)

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