alert http $EXTERNAL_NET any -> $HOME_NET any (msg:"ET MALWARE nspps Backdoor - Task Response"; flow:established,to_client; http.stat_code; content:"404"; file_data; bsize:10; content:"|62 37 55 14 af 59 9f 28 ab 34|"; fast_pattern; reference:url,ironnet.com/blog/malware-analysis-nspps-a-go-rat-backdoor/; reference:md5,435716b4f56cf94fdb7f6085dced41e5; classtype:command-and-control; sid:2030110; rev:1; metadata:affected_product Linux, attack_target Client_Endpoint, created_at 2020_05_05, deployment Perimeter, confidence Medium, signature_severity Major, updated_at 2020_05_05;)