1

In the organization I work for, the computers are connected in a network, and I can access each PC's filesystem via '\' if I state the "Master User" credentials, once the login window pops up.

since I was not connected to the PC via a remote desktop session, but just navigated via the filesystem explorer, is there any way of knowing about it?

That is if someone did it for my PC?

2

Yes. The Windows event log (eventvwr.msc) on the local machine will show the logon in the Security log.

For example, the event details might look like this:

Log Name:      Security
Source:        Microsoft-Windows-Security-Auditing
Date:          23/03/2015 13:08:55
Event ID:      4624
Task Category: Logon
Level:         Information
Keywords:      Audit Success
User:          N/A
Computer:      POLYBOX
Description:
An account was successfully logged on.

Subject:
    Security ID:        SYSTEM
    Account Name:       POLYBOX$
    Account Domain:     WORKGROUP
    Logon ID:       0x3e7

Logon Type:         7

New Logon:
    Security ID:        POLYBOX\polynomial
    Account Name:       polynomial
    Account Domain:     POLYBOX
    Logon ID:       0x55539572
    Logon GUID:     {00000000-0000-0000-0000-000000000000}

Process Information:
    Process ID:     0x2f4
    Process Name:       C:\Windows\System32\winlogon.exe

Network Information:
    Workstation Name:   POLYBOX
    Source Network Address: 10.0.99.11
    Source Port:        12345

Detailed Authentication Information:
    Logon Process:      User32 
    Authentication Package: Negotiate
    Transited Services: -
    Package Name (NTLM only):   -
    Key Length:     0

Alternatively, security auditing can be set up to monitor the access of securable objects (files, registry keys, services, processes, users, groups, etc.) and provide a rich listing of changes made.

1

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