Event ID 4104: Creating Scriptblock text (… of …):

Windows Event ID Lookup: What Windows event IDs mean: 4625, 4624, 4740, 6008, 41, 7045, 1102 and 3,000 more, with Windows' own message text, the fields and what to check.

Look up a Windows event ID from Event Viewer, a SIEM alert or a log export: what it means, the fields it records, and what to check. Many IDs are used by more than one source (event 41 is both a Kernel-Power crash and a boot error), so every definition is shown, the one people usually mean first. The message text is Windows' own, read from the event providers of Windows 10.0.26200.0, 2026-10-28; the notes are ours, based on Microsoft's security auditing reference.

Try: 4625, 4624, 4740, 6008, 41, 1074, 7045, 1102, 4104, 1149

Creating Scriptblock text (… of …):

Event 4104

PowerShell

PowerShell/Operational log

Verbose / Warning

PowerShell logged the text of a script block it ran (script block logging). Suspicious-looking scripts are logged as warnings even without the policy enabled.

What to check: In PowerShell/Operational. Look for encoded commands, downloads (Invoke-WebRequest, DownloadString) and AMSI bypass attempts.

Related: 4103, 4688

Message and fields (as Event Viewer shows them)

Creating Scriptblock text (… of …):
…

ScriptBlock ID: …
Path: …

Accessing Windows in Notification period.

Event 4104

Winlogon

System log

Information

Message and fields (as Event Viewer shows them)

Accessing Windows in Notification period.