Forum Discussion
Tuning a defender alert
Hi all,
I'm looking for some guidance on tuning a Microsoft Defender alert.
I've received an alert that gets triggered when an encoded PowerShell command is executed. I attempted to suppress it by creating a custom rule specifying that if this encoded command is seen, it shouldn't trigger the alert. However, the rule doesn't seem to be working as expected.
Could anyone help me understand what I might be doing wrong or suggest a better approach to tuning this alert? I have attached images of the alert.
Thanks in advance!
1 Reply
You might want to double-check if the custom rule exactly matches the alert details sometimes even a small difference in the command or context can cause it to trigger again. Also, make sure the rule is applied to the right device group or user. Defender alerts can be behavior-based too, so even if the command is the same, a different execution context might still flag it. Instead of just suppressing, try using Advanced Hunting to better understand the activity pattern and fine-tune your rule accordingly.
