alert http $EXTERNAL_NET any -> $HOME_NET any (msg:"ET EXPLOIT Microsoft Windows Themes Spoofing (CVE-2024-21320)"; flow:established,to_client; http.response_body; content:"|5b|Theme|5d 0a|"; fast_pattern; startswith; pcre:"/\x0a(BrandImage|Wallpaper|Path)\x3d\x5c{2}/Q"; reference:url,www.akamai.com/blog/security-research/2024/mar/leaking-ntlm-credentials-through-windows-themes; reference:cve,2024-21320; classtype:attempted-user; sid:2060031; rev:1; metadata:attack_target Client_Endpoint, created_at 2025_02_11, cve CVE_2024_21320, deployment Perimeter, deployment Internal, confidence High, signature_severity Major, tag Exploit, updated_at 2025_02_11; target:dest_ip;)