alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Clipboard Monitor Data Exfiltration Attempt"; flow:established,to_server; http.method; content:"POST"; http.uri; pcre:"/^\/[a-z]{5,10}\/[a-z]{5,10}$/"; http.content_type; content:"application/json"; http.header_names; content:"|0d 0a|content-type|0d 0a|accept|0d 0a|host|0d 0a|content-legnth|0d 0a 0d 0a|"; content:!"|0d 0a|User-Agent|0d 0a|"; content:!"|0d 0a|Referer|0d 0a|"; http.request_body; content:"|7b 22|data|22 3a 22|"; startswith; fast_pattern; pcre:"/^[a-zA-Z0-9%+/=]{10}/R"; reference:md5,545bb77b4d2ef3e5f6c29da6133dbdf3; classtype:trojan-activity; sid:2052932; rev:1; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, affected_product Windows_11, attack_target Client_Endpoint, tls_state TLSDecrypt, created_at 2024_05_28, deployment Perimeter, deployment SSLDecrypt, malware_family Clipboard_Monitor, performance_impact Low, confidence High, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2024_05_28; target:src_ip;)