ET WEB_SPECIFIC_APPS Possible Attempted Microsoft Exchange RCE (CVE-2020-0688)

Query · suricata

flow:established,to_server;
http.method;
content:"GET";
http.uri; bsize:>600;
content:"/ecp/"; startswith;
content:"__VIEWSTATEGENERATOR="; distance:0;
content:"__VIEWSTATE="; distance:0;
Raw source ET WEB_SPECIFIC_APPS Possible Attempted Microsoft Exchange RCE (CVE-2020-0688) · Suricata
Esc
Published by Emerging Threats Open ↗, licensed under BSD 3-Clause ↗. Line breaks added for readability; the rule is otherwise unchanged. 
alert http $EXTERNAL_NET any -> $HOME_NET any (
    msg:"ET WEB_SPECIFIC_APPS Possible Attempted Microsoft Exchange RCE (CVE-2020-0688)";
    flow:established,to_server;
    http.method;
    content:"GET";
    http.uri; bsize:>600;
    content:"/ecp/"; startswith;
    content:"__VIEWSTATEGENERATOR="; distance:0;
    content:"__VIEWSTATE="; distance:0;
    reference:url,www.thezdi.com/blog/2020/2/24/cve-2020-0688-remote-code-execution-on-microsoft-exchange-server-through-fixed-cryptographic-keyscve;
    reference:cve,2020-0688;
    reference:url,www.trustedsec.com/blog/detecting-cve-20200688-remote-code-execution-vulnerability-on-microsoft-exchange-server/;
    classtype:attempted-admin;
    sid:2029540; rev:2;
    metadata:affected_product Web_Server_Applications, attack_target SMTP_Server, created_at 2020_02_26, cve CVE_2020_0688, deployment Perimeter, deployment SSLDecrypt, performance_impact Low, confidence Medium, signature_severity Major, tag CISA_KEV, updated_at 2020_03_02;
)

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