ET EXPLOIT Possible SolarWinds Orion RCE Inbound (CVE-2021-31474)

Query · suricata

flow:established,to_server;
http.method;
content:"POST";
http.uri;
content:"/api/Action/TestAction"; fast_pattern;
http.request_body;
content:"$type|22 3a 20 22|System.Byte|5b 5d|,|20|mscorlib";
content:"$value|22 3a 20 22|"; distance:0;
pcre:"/^(?:[A-Z0-9+/]{4})*(?:[A-Z0-9+/]{2}==|[A-Z0-9+/]{3}=|[A-Z0-9+/]{4})/R";
Raw source ET EXPLOIT Possible SolarWinds Orion RCE Inbound (CVE-2021-31474) · 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,$HTTP_SERVERS] any (
    msg:"ET EXPLOIT Possible SolarWinds Orion RCE Inbound (CVE-2021-31474)";
    flow:established,to_server;
    http.method;
    content:"POST";
    http.uri;
    content:"/api/Action/TestAction"; fast_pattern;
    http.request_body;
    content:"$type|22 3a 20 22|System.Byte|5b 5d|,|20|mscorlib";
    content:"$value|22 3a 20 22|"; distance:0;
    pcre:"/^(?:[A-Z0-9+/]{4})*(?:[A-Z0-9+/]{2}==|[A-Z0-9+/]{3}=|[A-Z0-9+/]{4})/R";
    reference:cve,2021-31474;
    classtype:attempted-admin;
    sid:2033035; rev:1;
    metadata:attack_target Server, created_at 2021_05_27, cve CVE_2021_31474, deployment Perimeter, deployment Internal, deployment SSLDecrypt, confidence Medium, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2021_05_27;
)

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