""ET INFO External IP Address Lookup Domain (ipify .org) in TLS SNI""
SID: 2047703
Revision: 1
Class Type: misc-activity
Metadata: affected_product Any, attack_target Client_and_Server, created_at 2023_08_22, deployment Perimeter, performance_impact Low, confidence High, signature_severity Informational, tag External_IP_Lookup, updated_at 2023_08_22, reviewed_at 2023_08_22
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: "ipify.org"
Within: 1
PCRE: "/^(?:\x00\x09|.\x2e)ipify.org/R"
Special Options: