""ET WEB_SERVER Possible AntSword Webshell Commands Inbound""

SID: 2030037

Revision: 2

Class Type: web-application-attack

Metadata: affected_product Web_Server_Applications, attack_target Web_Server, created_at 2020_04_28, deployment Perimeter, signature_severity Major, updated_at 2020_04_28

Reference:

Protocol: tcp

Source Network: $EXTERNAL_NET

Source Port: any

Destination Network: any

Destination Port: $HTTP_PORTS

Flow: established,to_server

Contents:

  • Value: "POST"

  • Value: "Response.Write(|25|22"

  • Value: "eval(System.Text.Encoding.GetEncoding(|25|22"

  • Value: "|25|22).GetString(System.Convert.FromBase64String(|25|22"

  • Value: ")|25|3BResponse.End()|25|3B&"

Within: 50

PCRE:

Special Options:

  • http_method

  • nocase

  • http_client_body

  • nocase

  • http_client_body

  • nocase

  • http_client_body

  • nocase

  • http_client_body

  • fast_pattern

source