ET MALWARE Win32/LeftHook Stealer - CnC Response (get_socket)

Query · suricata

flow:established,to_client;
http.content_len;
byte_test:0,<=,50,0,string,dec;
http.header;
content:"Connection|3a 20|keep-alive|0d 0a|";
content:"Content-Language|3a 20|ru|0d 0a|";
http.response_body;
content:"|7b 22|address|22 3a 22|"; startswith;
pcre:"/^(?:[0-9]{1,3}\.){3}[0-9]{1,3}/R";
content:"|22 2c 22|collect|5f|data|22 3a|"; fast_pattern;
pcre:"/^(?:false|true)\x7d$/R";
Raw source ET MALWARE Win32/LeftHook Stealer - CnC Response (get_socket) · 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 -> $HOME_NET any (
    msg:"ET MALWARE Win32/LeftHook Stealer - CnC Response (get_socket)";
    flow:established,to_client;
    http.content_len;
    byte_test:0,<=,50,0,string,dec;
    http.header;
    content:"Connection|3a 20|keep-alive|0d 0a|";
    content:"Content-Language|3a 20|ru|0d 0a|";
    http.response_body;
    content:"|7b 22|address|22 3a 22|"; startswith;
    pcre:"/^(?:[0-9]{1,3}\.){3}[0-9]{1,3}/R";
    content:"|22 2c 22|collect|5f|data|22 3a|"; fast_pattern;
    pcre:"/^(?:false|true)\x7d$/R";
    reference:url,twitter.com/crep1x/status/1648063045808148481;
    reference:md5,61bb691f0c875d3d82521a6fa878e402;
    classtype:command-and-control;
    sid:2045006; rev:4;
    metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2023_04_18, deployment Perimeter, malware_family Win32_LeftHook, confidence High, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2023_12_28;
)

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