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Issue with correlation rule

Good morning,

I would like to ask you about an issue with rule configuration for SIEM platforms.

In this case, we have configured this rule for user managment, but we still having problems with false positive cases ending with the character "$" (we are using 'USER$' as watchlist using this common regex '.*\$\s*$'  and ADM-ALLOWED is other WL with a list of ADM USERS)

Device Type (In) [Windows Event Log – WMI] AND

Signature ID (In) [43-263047220] AND

Destination User (Not In) [USER$] AND

Source User (Not In) [ADM-ALLOWED]

Any help with this problem?

Many thanks in advanced

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