alert http $EXTERNAL_NET any -> $HOME_NET any (msg:"ET MALWARE CountLoader CnC Response"; flow:established,to_client; flowbits:isset,ET.CountLoader; http.response_body; content:"eyJhbGciOiJ"; startswith; content:"IsInR5cCI6IkpXVCJ9|2e|"; fast_pattern; reference:url,silentpush.com/blog/countloader; reference:md5,8beece81a6dca4e5a8483f56917344ff; classtype:trojan-activity; sid:2072403; rev:1; metadata:affected_product Windows_Client, attack_target Client_Endpoint, tls_state TLSDecrypt, created_at 2026_10_08, deployment Perimeter, deployment SSLDecrypt, malware_family CountLoader, confidence High, signature_severity Critical, updated_at 2026_10_08; target:dest_ip;)