alert tcp $HOME_NET any -> $EXTERNAL_NET 21 (msg:"ET MALWARE [PTsecurity] Black Stealer Exfil FTP STOR"; flow:established,to_server; content:"STOR Black Stealer"; depth:18; nocase; fast_pattern; classtype:trojan-activity; sid:2024791; rev:1; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2017_10_02, deployment Perimeter, performance_impact Low, confidence High, signature_severity Major, updated_at 2019_07_26;)