SID: 2037771

Revision: 2

Class Type: trojan-activity

Metadata: attack_target Client_Endpoint, created_at 2022_07_15, deployment Perimeter, signature_severity Major, updated_at 2023_05_19, reviewed_at 2023_09_01

Reference:

Protocol: tcp

Source Network: $EXTERNAL_NET

Source Port: $HTTP_PORTS

Destination Network: $HOME_NET

Destination Port: any

Flow: established,to_client

Contents:

  • Value: "Cookie|3a 20|btst="

  • Value: "btst=" Depth: 5

Within:

PCRE: "/^btst=[a-f0-9]{32}\x7c\d{1,3}.\d{1,3}.\d{1,3}.\d{1,3}\x7c/C"

Special Options:

  • fast_pattern

  • http_cookie

source