alert http1 $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE SnappyTCP Reverse Shell Client Checkin M1"; flow:established,to_server; http.request_line; bsize:22; content:"GET|20 2f|sy|2e|php|20|HTTP|2f|1|2e|1"; fast_pattern; http.header_names; bsize:20; content:"|0d 0a|Host|0d 0a|Hostname|0d 0a 0d 0a|"; reference:url,pwc.com/gx/en/issues/cybersecurity/cyber-threat-intelligence/tortoise-and-malwahare.html; classtype:trojan-activity; sid:2049528; rev:3; metadata:affected_product Linux, attack_target Client_Endpoint, created_at 2023_12_06, deployment Perimeter, deployment SSLDecrypt, confidence High, signature_severity Critical, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2024_04_03;)