ET MALWARE MSIL/Khonsri Ransomware CnC Activity

Query · suricata

flow:established,to_server;
http.method;
content:"GET";
http.uri;
content:"/zambos_caldo_de_p.txt"; startswith; fast_pattern;
http.header_names;
content:!"User-Agent";
Raw source ET MALWARE MSIL/Khonsri Ransomware CnC Activity · 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 MSIL/Khonsri Ransomware CnC Activity";
    flow:established,to_server;
    http.method;
    content:"GET";
    http.uri;
    content:"/zambos_caldo_de_p.txt"; startswith; fast_pattern;
    http.header_names;
    content:!"User-Agent";
    reference:url,businessinsights.bitdefender.com/technical-advisory-zero-day-critical-vulnerability-in-log4j2-exploited-in-the-wild;
    classtype:command-and-control;
    sid:2034723; rev:1;
    metadata:attack_target Client_Endpoint, created_at 2021_12_14, deployment Perimeter, malware_family MSIL_Khonsri, performance_impact Low, confidence High, signature_severity Major, tag Ransomware, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2021_12_14, mitre_tactic_id TA0040, mitre_tactic_name Impact, mitre_technique_id T1486, mitre_technique_name Data_Encrypted_for_Impact;
)

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.