# ============================================================================
# CYBERDUDEBIVASH SENTINEL APEX — Detection Pack
# Traceability:
#   CVE ............ CVE-2026-33825
#   Vendor / Product Microsoft / Defender
#   CISA KEV ....... added 2026-04-22, federal remediation due 2026-05-06
#   Ransomware ..... Known
#   NVD ............ https://nvd.nist.gov/vuln/detail/CVE-2026-33825
#   KEV catalog .... https://www.cisa.gov/known-exploited-vulnerabilities-catalog
# Every claim in this rule's metadata is verifiable against the sources above.
# ============================================================================
title: Suspicious Modification of Microsoft Defender Platform Path (CVE-2026-33825)
id: accb4406-071f-5f86-84b7-733dbfd56c46
status: experimental
description: |
    Detects non-SYSTEM writes into the Microsoft Defender Antimalware Platform directory, consistent with the access-control LPE (ransomware-linked in the CISA KEV catalog).
references:
    - https://nvd.nist.gov/vuln/detail/CVE-2026-33825
    - https://www.cisa.gov/known-exploited-vulnerabilities-catalog
    - https://blog.cyberdudebivash.in/detections/
author: CYBERDUDEBIVASH SENTINEL APEX
date: 2026/07/05
tags:
    - attack.privilege_escalation
    - attack.t1068
    - attack.defense_evasion
    - attack.t1562.001
    - cve.2026.33825
logsource:
    category: file_event
    product: windows
detection:
    selection:
        TargetFilename|contains: '\\Windows Defender\\Platform\\'
    filter_system:
        User|contains:
            - 'SYSTEM'
            - 'TrustedInstaller'
    condition: selection and not filter_system
    fields:
        - Image
        - User
        - TargetFilename
falsepositives:
    - Legitimate Defender platform updates (delivered by TrustedInstaller / SYSTEM — exclude those accounts).
level: high