5142 Security log · Object Access medium severity low volume

Windows Event ID 5142 — A network share object was added

A new network share was created.

Why event 5142 matters

Attackers create shares to stage data for exfiltration or to provide access to tools from remote systems.

How to detect it

Alert: share creation by non-IT accounts. Alert: shares with broad permissions (Everyone, Authenticated Users with write).

Log source
Security
Advanced Audit Policy — enable the 'Object Access' subcategory (Success and/or Failure).
Fields to pivot on
SubjectUserNameTargetUserNameLogonTypeIpAddressWorkstationName

MITRE ATT&CK mapping

Tactic Technique
Exfiltration Exfiltration Over Alternative Protocol (T1048)

Detection queries

Starting points — adapt the log source, projected fields and thresholds for your environment.

Sentinel / Defender KQL
SecurityEvent
| where EventID == 5142   // A network share object was added
| project TimeGenerated, Computer, SubjectUserName, TargetUserName, LogonType, IpAddress, WorkstationName
| sort by TimeGenerated desc
Splunk SPL
index=* sourcetype="WinEventLog:Security" EventCode=5142
| stats count earliest(_time) as first_seen latest(_time) as last_seen by ComputerName
| sort - count   `# A network share object was added — add EventData fields: SubjectUserName, TargetUserName, LogonType, IpAddress`
Hunt event 5142 in Sentinel/Defender →
Build a KQL query for this event in the KQL Query Builder.
Search all event IDs →
Open the interactive Windows Event ID lookup.

Related Object Access events

4656 A handle to an object was requested 4657 A registry value was modified 4658 The handle to an object was closed 4660 An object was deleted 4663 An attempt was made to access an object 4665 An attempt was made to create an application client context 4670 Permissions on an object were changed 4690 An attempt was made to duplicate a handle to an object 4985 The state of a transaction has changed 5140 A network share object was accessed 5143 A network share object was modified 5144 A network share object was deleted

Frequently asked questions

What is Windows Event ID 5142?

A network share object was added. A new network share was created.

Which log records event 5142?

Event 5142 is written to the Security channel by Microsoft-Windows-Security-Auditing. Advanced Audit Policy — enable the 'Object Access' subcategory (Success and/or Failure).

What MITRE ATT&CK techniques map to event 5142?

Event 5142 is associated with: Exfiltration Over Alternative Protocol (T1048).

How do you detect activity around event 5142?

Alert: share creation by non-IT accounts. Alert: shares with broad permissions (Everyone, Authenticated Users with write).