ET EXPLOIT vCenter Server RCE Chain Initial Stage Inbound (CVE-2021-21985)

Query · suricata

flow:established,to_server;
http.method;
content:"POST";
http.uri;
content:"/ui/h5-vsan/";
content:"/&vsanProviderUtils_setVmodlHelper/setTargetObject"; endswith; fast_pattern;
http.request_body;
content:"|22|methodInput|22|";
content:"|5b|null|5d|"; distance:0;
pcre:"/^\x7b/s*\x22methodInput\x22\s*\x3a\s*\x5bnull\x5d/";
xbits:set,ET.2021_21985,track ip_src,expire 60;

Rule dependencies

Feeds into

Raw source ET EXPLOIT vCenter Server RCE Chain Initial Stage Inbound (CVE-2021-21985) · 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 -> [$HOME_NET,$HTTP_SERVERS] any (
    msg:"ET EXPLOIT vCenter Server RCE Chain Initial Stage Inbound (CVE-2021-21985)";
    flow:established,to_server;
    http.method;
    content:"POST";
    http.uri;
    content:"/ui/h5-vsan/";
    content:"/&vsanProviderUtils_setVmodlHelper/setTargetObject"; endswith; fast_pattern;
    http.request_body;
    content:"|22|methodInput|22|";
    content:"|5b|null|5d|"; distance:0;
    pcre:"/^\x7b/s*\x22methodInput\x22\s*\x3a\s*\x5bnull\x5d/";
    xbits:set,ET.2021_21985,track ip_src,expire 60;
    reference:url,www.iswin.org/2021/06/02/Vcenter-Server-CVE-2021-21985-RCE-PAYLOAD/;
    reference:cve,2021-21985;
    classtype:attempted-admin;
    sid:2033755; rev:1;
    metadata:created_at 2021_08_20, cve CVE_2021_21985, confidence Medium, signature_severity Major, tag CISA_KEV, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2021_08_20;
)

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