""ET INFO Observed Telegram API Domain (api .telegram .org in TLS SNI)""

SID: 2033967

Revision: 2

Class Type: misc-activity

Metadata: attack_target Client_Endpoint, created_at 2021_09_16, deployment Perimeter, performance_impact Low, signature_severity Informational, updated_at 2021_09_16

Reference:

Protocol: tcp

Source Network: $HOME_NET

Source Port: any

Destination Network: $EXTERNAL_NET

Destination Port: 443

Flow: established,to_server

Contents:

  • Value: "|16|"

  • Value: "|01|"

  • Value: "|00 00 10|api.telegram.org"

Within: 8

PCRE:

Special Options:

  • fast_pattern

source