alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Synapse/Lambda Ransomware CnC Checkin"; flow:established,to_server; http.method; content:"POST"; http.uri; content:".php"; endswith; http.user_agent; content:"AppleWebKit/587.38|20 28|KHTML, like Gecko|29|"; http.request_body; content:"J325q4JURN"; fast_pattern; startswith; reference:md5,4b33216a968a3a12895b87b9ee258637; reference:url,twitter.com/rivitna2/status/1757053934852583891; classtype:trojan-activity; sid:2050809; rev:1; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, affected_product Windows_11, attack_target Client_and_Server, created_at 2024_02_13, deployment Perimeter, malware_family Synapse, malware_family Lambda, performance_impact Low, confidence High, signature_severity Major, updated_at 2024_02_13; target:src_ip;)