ET MALWARE InvisibleFerret CnC Activity (GET) M2

Query · suricata

flow:established,to_server;
urilen:<13;
http.method;
content:"GET";
http.uri;
content:"/brow/"; startswith; fast_pattern;
pcre:"/^\d{1,3}\x2f\d{3,4}$/R";
http.user_agent;
content:"python-requests"; startswith;
http.connection;
content:"keep-alive";
http.header;
content:"|0d 0a|Accept|2d|Encoding|3a 20|gzip|2c 20|deflate|0d 0a|";
target:src_ip;
Raw source ET MALWARE InvisibleFerret CnC Activity (GET) M2 · 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 -> $EXTERNAL_NET any (
    msg:"ET MALWARE InvisibleFerret CnC Activity (GET) M2";
    flow:established,to_server;
    urilen:<13;
    http.method;
    content:"GET";
    http.uri;
    content:"/brow/"; startswith; fast_pattern;
    pcre:"/^\d{1,3}\x2f\d{3,4}$/R";
    http.user_agent;
    content:"python-requests"; startswith;
    http.connection;
    content:"keep-alive";
    http.header;
    content:"|0d 0a|Accept|2d|Encoding|3a 20|gzip|2c 20|deflate|0d 0a|";
    reference:md5,2a8e4281213e4aaa485612f9ded261a2;
    reference:url,mp.weixin.qq.com/s?__biz=MzUyMjk4NzExMA==&mid=2247505519&idx=1&sn=594229f2c0123673d1fa9c6cf729858b&chksm=f9c1e566ceb66c701d875de8481fe02d89654d4b56cfc51088de6e421cb701437cdab52a0851&scene=178&cur_album_id=1955835290309230595;
    reference:url,esentire.com/blog/bored-beavertail-invisibleferret-yacht-club-a-lazarus-lure-pt-2;
    reference:url,any.run/cybersecurity-blog/invisibleferret-malware-analysis/;
    classtype:trojan-activity;
    sid:2059634; rev:1;
    metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, tls_state plaintext, created_at 2025_01_24, deployment Perimeter, malware_family InvisibleFerret, confidence High, signature_severity Major, tag Lazarus, tag c2, tag TA444, updated_at 2025_01_24, mitre_tactic_id TA0011, mitre_tactic_name Command_And_Control, mitre_technique_id T1071, mitre_technique_name Application_Layer_Protocol;
    target:src_ip;
)

Detection rules belong to the projects that publish them and remain under their own licenses. This site indexes and links to them; it claims no rights in them.