""ET EXPLOIT Possible Malicious x-sharing-config-url SMTP header observed (CVE-2023-35636)""

SID: 2050433

Revision: 1

Class Type: trojan-activity

Metadata: affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, affected_product Windows_11, attack_target Client_Endpoint, created_at 2024_01_24, cve CVE_2023_35636, deployment Perimeter, deployment SSLDecrypt, performance_impact Low, confidence High, signature_severity Major, updated_at 2024_01_24

Reference:

  • cve

  • 2023-35636

Protocol: tcp

Source Network: any

Source Port: any

Destination Network: $HOME_NET

Destination Port: [25,587]

Flow: established,to_server

Contents:

  • Value: "Content-Class|3a 20|Sharing"

  • Value: "x-sharing-config-url|3a 20|\"

  • Value: ".ics"

Within: 50

PCRE:

Special Options:

  • nocase

  • nocase

  • fast_pattern

source