ET EXPLOIT_KIT Possible PurpleFox EK Framework URI Struct Payload Request M1

Query · suricata

flow:established,to_server;
http.method;
content:"GET";
http.uri;
content:"/up.php?key="; startswith; bsize:13; fast_pattern;
pcre:"/^\d$/R";
Raw source ET EXPLOIT_KIT Possible PurpleFox EK Framework URI Struct Payload Request M1 · Suricata
Esc
Published by Emerging Threats Open ↗, licensed under BSD 3-Clause ↗. Line breaks added for readability; the rule is otherwise unchanged. 
alert http $HOME_NET any -> $EXTERNAL_NET any (
    msg:"ET EXPLOIT_KIT Possible PurpleFox EK Framework URI Struct Payload Request M1";
    flow:established,to_server;
    http.method;
    content:"GET";
    http.uri;
    content:"/up.php?key="; startswith; bsize:13; fast_pattern;
    pcre:"/^\d$/R";
    reference:url,twitter.com/nao_sec/status/1343918070989877252;
    classtype:exploit-kit;
    sid:2031462; rev:2;
    metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2020_12_29, deployment Perimeter, confidence Medium, signature_severity Major, tag Exploit_Kit, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2020_12_29;
)

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