""ET CURRENT_EVENTS XHR POST Request - Possible Form Grabber Activity""

SID: 2027818

Revision: 2

Class Type: trojan-activity

Metadata: affected_product Web_Browsers, attack_target Client_Endpoint, created_at 2019_08_07, deployment Perimeter, deployment SSLDecrypt, performance_impact Low, signature_severity Major, tag CardSkimmer, updated_at 2019_08_07

Reference:

Protocol: tcp

Source Network: $HOME_NET

Source Port: any

Destination Network: $EXTERNAL_NET

Destination Port: $HTTP_PORTS

Flow: established,to_server

Contents:

  • Value: "POST"

  • Value: "info=" Depth: 5

  • Value: "&hostname="

  • Value: "&key="

  • Value: "Content-Type|3a 20|application|2f|x-www-form-urlencoded|0d|"

Within:

PCRE: "/^(?:[A-Z0-9+/]{4})*(?:[A-Z0-9+/]{2}==|[A-Z0-9+/]{3}=|[A-Z0-9+/]{4})/Ri"

Special Options:

  • http_method

  • http_client_body

  • http_client_body

  • fast_pattern

  • http_client_body

  • http_header

source