alert http $EXTERNAL_NET any -> $HOME_NET any (msg:"ET MALWARE Win32/SSLoad Registration Response"; flow:established,to_client; flowbits:isset,ET.SSLoad1_1.Registration; http.stat_code; content:"200"; http.content_type; content:"application/json"; file.data; content:"|7b 22|key|22 3a 20 22|"; startswith; fast_pattern; pcre:"/^[a-zA-Z0-9+\x2f=]{10,25}/R"; content:"|22 2c 20 22|id|22 3a 20 22|"; within:49; pcre:"/^[a-f0-9]{8}-([a-f0-9]{4}-){3}[a-f0-9]{12}/R"; content:"|22 7d|"; endswith; reference:md5,d6b0726de53f8a3da67a6e693485ca7a; reference:md5,ca303668b5420c022ef9c78ce1f2bfb7; classtype:trojan-activity; sid:2052169; rev:2; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, affected_product Windows_11, attack_target Client_Endpoint, tls_state plaintext, created_at 2024_04_18, deployment Perimeter, malware_family SSLoad, performance_impact Low, confidence High, signature_severity Major, updated_at 2024_10_07, reviewed_at 2025_07_14; target:dest_ip;)