ET MALWARE Suspected Tick Group APT Related Activity (GET)

Query · suricata

flow:established,to_server;
urilen:>40;
http.method;
content:"GET";
http.uri;
pcre:"/\/(?:[A-Za-z0-9+/]{4})*(?:[A-Za-z0-9+/]{2}==|[A-Za-z0-9+/]{3}=|[A-Za-z0-9+/]{4})\/$/";
http.header_names;
content:"|0d 0a|Connection|0d 0a|Accept|0d 0a|User-Agent|0d 0a|Host|0d 0a 0d 0a|"; bsize:42; fast_pattern;
http.user_agent;
content:"|3b 20|WinHttp.WinHttpRequest.";
target:src_ip;
Raw source ET MALWARE Suspected Tick Group APT Related Activity (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 -> $EXTERNAL_NET 1024: (
    msg:"ET MALWARE Suspected Tick Group APT Related Activity (GET)";
    flow:established,to_server;
    urilen:>40;
    http.method;
    content:"GET";
    http.uri;
    pcre:"/\/(?:[A-Za-z0-9+/]{4})*(?:[A-Za-z0-9+/]{2}==|[A-Za-z0-9+/]{3}=|[A-Za-z0-9+/]{4})\/$/";
    http.header_names;
    content:"|0d 0a|Connection|0d 0a|Accept|0d 0a|User-Agent|0d 0a|Host|0d 0a 0d 0a|"; bsize:42; fast_pattern;
    http.user_agent;
    content:"|3b 20|WinHttp.WinHttpRequest.";
    reference:md5,ed97cf996bda070de3b7fa1e75b762b1;
    reference:url,asec.ahnlab.com/ko/51150/;
    classtype:trojan-activity;
    sid:2044932; rev:1;
    metadata:attack_target Client_Endpoint, created_at 2023_04_13, deployment Perimeter, performance_impact Moderate, confidence Medium, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2023_04_14;
    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.