ET MALWARE Sekhmet Ransomware CnC Activity

Query · suricata

flow:established,to_server;
http.start;
content:"POST /update.php?id="; startswith; fast_pattern;
pcre:"/^\d+\sHTTP\//R";
http.user_agent; bsize:34;
content:"Mozilla/4.0 (compatible|3b| MSIE 6.0)";
http.request_body;
pcre:"/^(?:[A-Za-z0-9+/]{4})*(?:[A-Za-z0-9+/]{2}==|[A-Za-z0-9+/]{3}=|[A-Za-z0-9+/]{4})\x00$/";
Raw source ET MALWARE Sekhmet 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 -> $EXTERNAL_NET any (
    msg:"ET MALWARE Sekhmet Ransomware CnC Activity";
    flow:established,to_server;
    http.start;
    content:"POST /update.php?id="; startswith; fast_pattern;
    pcre:"/^\d+\sHTTP\//R";
    http.user_agent; bsize:34;
    content:"Mozilla/4.0 (compatible|3b| MSIE 6.0)";
    http.request_body;
    pcre:"/^(?:[A-Za-z0-9+/]{4})*(?:[A-Za-z0-9+/]{2}==|[A-Za-z0-9+/]{3}=|[A-Za-z0-9+/]{4})\x00$/";
    reference:url,twitter.com/fbgwls245/status/1241179394405621760;
    reference:md5,b7ad5f7ec71dc812b4771950671b192a;
    classtype:command-and-control;
    sid:2029728; rev:1;
    metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2020_03_23, deployment Perimeter, confidence High, signature_severity Major, tag Ransomware, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2020_03_23, 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.