SigmaHQ/rules/windows/builtin/win_susp_raccess_sensitive_fext.yml

title: Suspicious Access to Sensitive File Extensions
id: 91c945bc-2ad1-4799-a591-4d00198a1215
description: Detects known sensitive file extensions accessed on a network share
author: Samir Bousseaden
date: 2019/04/03
modified: 2020/08/23
tags:
    - attack.collection
    - attack.t1039
logsource:
    product: windows
    service: security
detection:
    selection:
        EventID:
            - 5145
        RelativeTargetName:
            - '*.pst'
            - '*.ost'
            - '*.msg'
            - '*.nst'
            - '*.oab'
            - '*.edb'
            - '*.nsf'
            - '*.bak'
            - '*.dmp'
            - '*.kirbi'
            - '*\groups.xml'
            - '*.rdp'
    condition: selection
fields:
    - ComputerName
    - SubjectDomainName
    - SubjectUserName
    - RelativeTargetName
falsepositives:
    - Help Desk operator doing backup or re-imaging end user machine or pentest or backup software
    - Users working with these data types or exchanging message files
level: medium