ET EXPLOIT Microsoft Exchange Server Exploitation (CVE-2020-17141)

Query · suricata

flow:to_server,established;
http.method;
content:"POST";
http.uri;
content:"/ews/Exchange.asmx"; startswith;
http.request_body;
content:"<m:RouteComplaint|20|";
content:"<m:Data>"; distance:0;
base64_decode:bytes 300, offset 0, relative;
base64_data;
content:"<!DOCTYPE";
content:"SYSTEM"; distance:0;
Raw source ET EXPLOIT Microsoft Exchange Server Exploitation (CVE-2020-17141) · Suricata
Esc
Published by Emerging Threats Open ↗, licensed under BSD 3-Clause ↗. Line breaks added for readability; the rule is otherwise unchanged. 
alert http any any -> any any (
    msg:"ET EXPLOIT Microsoft Exchange Server Exploitation (CVE-2020-17141)";
    flow:to_server,established;
    http.method;
    content:"POST";
    http.uri;
    content:"/ews/Exchange.asmx"; startswith;
    http.request_body;
    content:"<m:RouteComplaint|20|";
    content:"<m:Data>"; distance:0;
    base64_decode:bytes 300, offset 0, relative;
    base64_data;
    content:"<!DOCTYPE";
    content:"SYSTEM"; distance:0;
    classtype:web-application-attack;
    sid:2031507; rev:1;
    metadata:attack_target Server, created_at 2021_01_08, cve CVE_2020_17141, deployment Perimeter, deployment Internal, confidence High, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2023_04_19;
)

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