php-webshells 8 php-webshell 5 webshell 4 php-webshell-backdoor 3 backdoor 2 wso 2 wso-shell 2 wso-webshell 2 php-backdoor 2 webshells 2 emotet 1 infected-files 1 maliciouscode 1 malware-sample 1 malware-samples 1 obfuscated-code 1 php 1 trojan-horse 1 trojan-malware 1 wordpress 1 wordpress-plugin 1 xgboost 1 webshell-detect 1 tf-idf 1 opcode 1 n-gram 1 machine-learning 1 jsp-webshell 1 hidden-shells 1 detection-bypass 1 bypass-antivirus 1 asp-webshell 1