""ET INFO Observed Commonly Abused Link Aggregating Service Domain (linkbio .co) in TLS SNI""

SID: 2054894

Revision: 1

Class Type: misc-activity

Metadata: affected_product Any, attack_target Client_Endpoint, created_at 2024_08_05, deployment Perimeter, performance_impact Low, confidence High, signature_severity Informational, tag link_aggregators, updated_at 2024_08_05

Reference:

• Link

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 0a|linkbio.co"

Within: 8

PCRE:

Special Options:

• fast_pattern

source