ET HUNTING Executable File Hosted via Cloudflare Services (* .trycloudflare .com)

Query · suricata

flow:established,to_server;
http.host;
content:".trycloudflare.com"; fast_pattern; endswith;
http.uri;
content:".";
pcre:"/^(?:wsf|js|jse|vbs|vbe|bat|cmd|ps1|hta|lnk|url|scr|msi|cpl|sh|bash|zsh|py|pl|rb|php|jar|app|command|pkg|dmg|run|bin|tar|tgz|zip)(?:$|[?#&])/Ri";
Raw source ET HUNTING Executable File Hosted via Cloudflare Services (* .trycloudflare .com) · 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 -> $EXTERNAL_NET any (
    msg:"ET HUNTING Executable File Hosted via Cloudflare Services (* .trycloudflare .com)";
    flow:established,to_server;
    http.host;
    content:".trycloudflare.com"; fast_pattern; endswith;
    http.uri;
    content:".";
    pcre:"/^(?:wsf|js|jse|vbs|vbe|bat|cmd|ps1|hta|lnk|url|scr|msi|cpl|sh|bash|zsh|py|pl|rb|php|jar|app|command|pkg|dmg|run|bin|tar|tgz|zip)(?:$|[?#&])/Ri";
    reference:url,cofense.com/blog/how-cloudflare-services-are-abused-for-credential-theft-and-malware-distribution;
    reference:url,developers.cloudflare.com/cloudflare-one/networks/connectors/cloudflare-tunnel/do-more-with-tunnels/trycloudflare/;
    classtype:misc-activity;
    sid:2068663; rev:1;
    metadata:attack_target Client_Endpoint, created_at 2026_04_09, deployment Perimeter, confidence High, signature_severity Informational, updated_at 2026_04_09;
)

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