""ET WEB_CLIENT Generic Webshell Accessed on Compromised External Server""

SID: 2030019

Revision: 2

Class Type: web-application-attack

Metadata: affected_product Web_Server_Applications, attack_target Web_Server, created_at 2020_04_24, deployment Perimeter, signature_severity Major, updated_at 2020_04_24

Reference:

Protocol: tcp

Source Network: $EXTERNAL_NET

Source Port: $HTTP_PORTS

Destination Network: $HOME_NET

Destination Port: any

Flow: established,to_client

Contents:

  • Value: "Upload File : <input type=|22|file|22 20|name=|22|file|22|"

  • Value: ">Name"

  • Value: ">Size"

  • Value: ">Permissions"

  • Value: ">Options"

  • Value: ""

  • Value: ""

  • Value: ""

  • Value: "<form method=|22|POST|22 20|action=|22|?option&path="

Within:

PCRE:

Special Options:

  • file_data

  • fast_pattern

  • nocase

  • nocase

  • nocase

  • nocase

  • nocase

  • nocase

  • nocase

  • nocase

  • nocase

source