ET MALWARE Bitter APT CHM CnC Activity (GET) M1

Query · suricata

flow:established,to_server;
http.method;
content:"GET";
http.uri;
content:".php?st="; offset:10; depth:16; fast_pattern;
content:"|2a|"; distance:0;
http.user_agent;
content:"Windows Installer"; bsize:17;
Raw source ET MALWARE Bitter APT CHM CnC Activity (GET) M1 · 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 Bitter APT CHM CnC Activity (GET) M1";
    flow:established,to_server;
    http.method;
    content:"GET";
    http.uri;
    content:".php?st="; offset:10; depth:16; fast_pattern;
    content:"|2a|"; distance:0;
    http.user_agent;
    content:"Windows Installer"; bsize:17;
    reference:md5,313bee67ac85d0aed3fbd049f9d2b0e3;
    reference:url,twitter.com/Jup1a/status/1569578703289720837;
    reference:md5,16696b82884de21b3ef5a3b27872d53c;
    classtype:trojan-activity;
    sid:2038820; rev:2;
    metadata:attack_target Client_Endpoint, created_at 2022_09_01, deployment Perimeter, malware_family Sidewinder, confidence High, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2024_01_31, reviewed_at 2025_10_24;
)

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