""ET TROJAN DNSpionage Commands Embedded in Webpage Inbound""

SID: 2026672

Revision: 2

Class Type: trojan-activity

Metadata: affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2018_11_28, deployment Perimeter, performance_impact Low, signature_severity Major, tag DNSpionage, updated_at 2018_11_28

Reference:

Protocol: tcp

Source Network: $EXTERNAL_NET

Source Port: $HTTP_PORTS

Destination Network: $HOME_NET

Destination Port: any

Flow: established,from_server

Contents:

  • Value: "200"

  • Value: "|3c 21 2d 2d|eyJjIjogI"

  • Value: "|3c 21 2d 2d|"

Within:

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

Special Options:

  • http_stat_code

  • file_data

  • fast_pattern

source