""ET TROJAN Observed FinSpy Domain (browserupdate .download in TLS SNI)""

SID: 2030962

Revision: 3

Class Type: trojan-activity

Metadata: attack_target Client_Endpoint, created_at 2020_10_05, deployment Perimeter, performance_impact Low, signature_severity Major, updated_at 2022_03_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|"

  • Value: "|00|"

  • Value: "browserupdate.download"

Within: 1

PCRE: "/^(?:\x00\x16|.\x2e)browserupdate.download/R"

Special Options:

source