""ET TROJAN Observed KrustyLoader Domain (farstream .org) in TLS SNI""

SID: 2050636

Revision: 1

Class Type: trojan-activity

Metadata: affected_product Linux, affected_product Ivanti, attack_target Networking_Equipment, created_at 2024_01_31, deployment Perimeter, malware_family KrustyLoader, performance_impact Low, confidence High, signature_severity Major, updated_at 2024_01_31

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|"

  • Value: "|00|"

  • Value: "farstream.org"

Within: 1

PCRE: "/^(?:\x00\x0d|.\x2e)farstream.org/R"

Special Options:

source