ET MALWARE Win32/GandCrab Ransomware CnC Activity

Query · suricata

flow:established,to_server;
http.method;
content:"POST";
http.uri;
content:".php?token="; fast_pattern;
pcre:"/^[0-9]{2,6}$/R";
http.request_body;
content:"data="; depth:5;
pcre:"/^(?:[A-Za-z0-9+/]{4})*(?:[A-Za-z0-9+/]{2}==|[A-Za-z0-9+/]{3}=|[A-Za-z0-9+/]{4})$/Rs";
http.content_len;
byte_test:0,>,200,0,string,dec;
http.header_names;
content:!"Referer";
content:!"Accept";
content:!"Cookie";
Raw source ET MALWARE Win32/GandCrab 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 -> $EXTERNAL_NET any (
    msg:"ET MALWARE Win32/GandCrab Ransomware CnC Activity";
    flow:established,to_server;
    http.method;
    content:"POST";
    http.uri;
    content:".php?token="; fast_pattern;
    pcre:"/^[0-9]{2,6}$/R";
    http.request_body;
    content:"data="; depth:5;
    pcre:"/^(?:[A-Za-z0-9+/]{4})*(?:[A-Za-z0-9+/]{2}==|[A-Za-z0-9+/]{3}=|[A-Za-z0-9+/]{4})$/Rs";
    http.content_len;
    byte_test:0,>,200,0,string,dec;
    http.header_names;
    content:!"Referer";
    content:!"Accept";
    content:!"Cookie";
    reference:md5,aedf80c426fb649bb258e430a3830d85;
    classtype:command-and-control;
    sid:2025254; rev:2;
    metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2018_01_26, deployment Perimeter, malware_family GandCrab, confidence High, signature_severity Major, tag Ransomware, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2020_08_24, mitre_tactic_id TA0040, mitre_tactic_name Impact, mitre_technique_id T1486, mitre_technique_name Data_Encrypted_for_Impact;
)

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