""ET INFO Observed URL Shortener Domain (lk .tc in TLS SNI)""
SID: 2035743
Revision: 2
Class Type: misc-activity
Metadata: affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2022_04_04, deployment Perimeter, signature_severity Informational, updated_at 2022_04_04
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: "lk.tc"
Within: 1
PCRE: "/^(?:\x00\x05|.\x2e)lk.tc/R"
Special Options: