alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE SnappyTCP Reverse Shell Header Value Observed"; flow:established,to_server; http.header; content:"X-Auth-43245-S-20|3a 20|"; reference:url,pwc.com/gx/en/issues/cybersecurity/cyber-threat-intelligence/tortoise-and-malwahare.html; classtype:trojan-activity; sid:2049527; rev:1; metadata:affected_product Linux, attack_target Client_Endpoint, created_at 2023_12_06, deployment Perimeter, deployment SSLDecrypt, confidence High, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2023_12_06;)