""ET TROJAN FRat WebSockets Request M2""

SID: 2030346

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 2020_06_16, deployment Perimeter, performance_impact Low, signature_severity Major, updated_at 2020_06_16

Reference:

Protocol: tcp

Source Network: $HOME_NET

Source Port: any

Destination Network: $EXTERNAL_NET

Destination Port: [$HTTP_PORTS,8443,443,7474]

Flow: established,to_server

Contents:

• Value: "GET /socket.io/?__sails_io_sdk_version=1.2.1&__sails_io_sdk_platform=node&__sails_io_sdk_language=javascript&EIO=3&transport=websocket HTTP/1.1|0d 0a|Sec-WebSocket-Version|3a 20|13|0d 0a|Sec-WebSocket-Key|3a 20|" Depth: 191

• Value: "|0d 0a|Connection|3a 20|Upgrade|0d 0a|Upgrade|3a 20|websocket|0d 0a|"

• Value: "Sec-WebSocket-Extensions|3a 20|permessage-deflate|3b 20|client_max_window_bits|0d 0a|Host|3a 20|"

Within:

PCRE: "/^[^\r\n]+\r\n\r\n$/R"

Special Options:

• fast_pattern

source