ET MALWARE MSIL/Karmen Ransomware CnC Activity

Query · suricata

flow:established,to_server;
http.method;
content:"GET";
http.uri;
content:"data.php?id="; fast_pattern;
pcre:"/\.php\?id=[A-Za-z0-9]{10,20}(?:&key=[A-Za-z0-9]{10,30})?$/i";
http.header;
pcre:"/^Host\x3a\x20[^\r\n]+\r\n(?:Connection\x3a\x20Keep-Alive\r\n)?(?:\r\n)?$/mi";
http.header_names;
content:!"User-Agent|0d 0a|";
content:!"Accept";
content:!"Referer|0d 0a|";
Raw source ET MALWARE MSIL/Karmen 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 -> $EXTERNAL_NET any (
    msg:"ET MALWARE MSIL/Karmen Ransomware CnC Activity";
    flow:established,to_server;
    http.method;
    content:"GET";
    http.uri;
    content:"data.php?id="; fast_pattern;
    pcre:"/\.php\?id=[A-Za-z0-9]{10,20}(?:&key=[A-Za-z0-9]{10,30})?$/i";
    http.header;
    pcre:"/^Host\x3a\x20[^\r\n]+\r\n(?:Connection\x3a\x20Keep-Alive\r\n)?(?:\r\n)?$/mi";
    http.header_names;
    content:!"User-Agent|0d 0a|";
    content:!"Accept";
    content:!"Referer|0d 0a|";
    reference:md5,05427ed1c477cc01910eb9adbf35068d;
    classtype:command-and-control;
    sid:2024239; rev:5;
    metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2017_03_15, deployment Perimeter, malware_family Karmen_Ransomware, confidence High, signature_severity Major, tag Ransomware, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2020_08_25, mitre_tactic_id TA0040, mitre_tactic_name Impact, mitre_technique_id T1486, mitre_technique_name Data_Encrypted_for_Impact;
)

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