Suspicious Access to Sensitive File Extensions (via security)

title: Suspicious Access to Sensitive File Extensions (via security)
id: 5b347c88-44c2-58d3-af9c-6baea01e0de0
status: stable
description: This rule detects known sensitive file extensions accessed on a network share
references:
    - https://attack.mitre.org/techniques/T1039/
    - Internal Research
author: Huntrule Team
date: 2026-07-10
tags:
    - attack.collection
    - attack.t1039
logsource:
    product: windows
    service: security
detection:
    selection:
        EventID: 5145
        RelativeTargetName|endswith:
            - '.bak'
            - '.dmp'
            - '.edb'
            - '.kirbi'
            - '.msg'
            - '.nsf'
            - '.nst'
            - '.oab'
            - '.ost'
            - '.pst'
            - '.rdp'
    condition: selection
falsepositives:
    - Unknown
level: medium