ET MALWARE APT33/CharmingKitten Encrypted Payload Inbound

Query · suricata

flow:established,from_server;
flowbits:isset,ET.APT33CharmingKitten.1;
http.stat_code;
content:"200";
http.header;
content:"|0d 0a|CacheControl|3a 20|"; fast_pattern;
file.data;
pcre:"/^(?:[A-Z0-9+\/]{4})*(?:[A-Z0-9+\/]{2}==|[A-Z0-9+\/]{3}=|[A-Z0-9+\/]{4})$/i";

Rule dependencies

⚠ Higher-order rule. It fires on other rules' alerts, not on raw events, so it cannot fire on its own. Deploy the rules it depends on too.

Depends on

Raw source ET MALWARE APT33/CharmingKitten Encrypted Payload Inbound · 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 -> $HOME_NET any (
    msg:"ET MALWARE APT33/CharmingKitten Encrypted Payload Inbound";
    flow:established,from_server;
    flowbits:isset,ET.APT33CharmingKitten.1;
    http.stat_code;
    content:"200";
    http.header;
    content:"|0d 0a|CacheControl|3a 20|"; fast_pattern;
    file.data;
    pcre:"/^(?:[A-Z0-9+\/]{4})*(?:[A-Z0-9+\/]{2}==|[A-Z0-9+\/]{3}=|[A-Z0-9+\/]{4})$/i";
    reference:md5,9881bccf12fd8ae71a03247d2ad61a06;
    classtype:targeted-activity;
    sid:2026578; rev:2;
    metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2018_11_05, deployment Perimeter, performance_impact Low, confidence High, signature_severity Major, tag APT33, tag CharmingKitten, updated_at 2020_08_27;
)

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.