ET MALWARE MSIL/Agent.TRM Data Exfil (sysinfo)

Query · suricata

flow:established,to_server;
http.method;
content:"POST";
http.start;
content:"Cookie|3a 20|dkv="; fast_pattern;
http.cookie;
content:"dkv="; startswith;
content:"|3b|YSC="; distance:32; within:5;
pcre:"/^dkv=[a-f0-9]{32}\x3bYSC=\d+$/C";
http.header_names;
content:!"Referer";
content:!"Content-Type";
http.request_body;
content:"DQpIb3N0IE5hbWU6"; startswith;
Raw source ET MALWARE MSIL/Agent.TRM Data Exfil (sysinfo) · 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 -> $EXTERNAL_NET any (
    msg:"ET MALWARE MSIL/Agent.TRM Data Exfil (sysinfo)";
    flow:established,to_server;
    http.method;
    content:"POST";
    http.start;
    content:"Cookie|3a 20|dkv="; fast_pattern;
    http.cookie;
    content:"dkv="; startswith;
    content:"|3b|YSC="; distance:32; within:5;
    pcre:"/^dkv=[a-f0-9]{32}\x3bYSC=\d+$/C";
    http.header_names;
    content:!"Referer";
    content:!"Content-Type";
    http.request_body;
    content:"DQpIb3N0IE5hbWU6"; startswith;
    reference:md5,d2b81c4f5d075daa681f823cc9a5e4c0;
    reference:url,twitter.com/w3ndige/status/1247547923845578755;
    classtype:command-and-control;
    sid:2029855; rev:2;
    metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2020_04_09, deployment Perimeter, deployment SSLDecrypt, malware_family MSIL_Agent_TRM, confidence High, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2020_12_31;
)

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