alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Xehook Stealer CnC Checkin"; flow:established,to_server; http.method; content:"GET"; http.uri; content:"/getjson.php?id|3d|"; fast_pattern; startswith; http.header_names; content:"|0d 0a|Host|0d 0a 0d 0a|"; flowbits:set,ET.XEHOOK.Checkin; reference:url,twitter.com/spamhaus/status/1762799827300008300; reference:md5,1c3c3d869eb0804b24ed9bb2fdd8f3f6; classtype:trojan-activity; sid:2051457; rev:1; metadata:attack_target Client_Endpoint, tls_state TLSDecrypt, created_at 2024_03_04, deployment Perimeter, deployment SSLDecrypt, malware_family Xehook, performance_impact Low, confidence High, signature_severity Major, updated_at 2024_03_04, reviewed_at 2025_07_14; target:src_ip;)