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

Query · suricata

flow:established,to_server;
http.method;
content:"POST";
http.uri;
content:"/ui/h5-vsan/";
content:"/&vsanProviderUtils_setVmodlHelper/invoke"; endswith; fast_pattern;
http.request_body;
content:"|22|methodInput|22|";
content:"|5b 5d|"; distance:0;
pcre:"/^\x7b/s*\x22methodInput\x22\s*\x3a\s*\x5b\x5d/";
xbits:isset,ET.2021_21985,track ip_src,expire 60;

Rule dependencies

⚠ Higher-order rule. It fires on other rules' alerts, not on raw events, so it cannot fire on its own. Deploy the rules it depends on too.

Depends on

Raw source ET EXPLOIT vCenter Server RCE Chain Final 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 Final Stage Inbound (CVE-2021-21985)";
    flow:established,to_server;
    http.method;
    content:"POST";
    http.uri;
    content:"/ui/h5-vsan/";
    content:"/&vsanProviderUtils_setVmodlHelper/invoke"; endswith; fast_pattern;
    http.request_body;
    content:"|22|methodInput|22|";
    content:"|5b 5d|"; distance:0;
    pcre:"/^\x7b/s*\x22methodInput\x22\s*\x3a\s*\x5b\x5d/";
    xbits:isset,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:2033756; rev:1;
    metadata:attack_target Server, created_at 2021_08_20, cve CVE_2021_21985, deployment Perimeter, deployment Internal, confidence Medium, signature_severity Major, tag Exploit, tag CISA_KEV, updated_at 2021_08_20, mitre_tactic_id TA0001, mitre_tactic_name Initial_Access, mitre_technique_id T1190, mitre_technique_name Exploit_Public_Facing_Application;
)

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