Filter Out computer name in some Rules

Hello,

I wish to filter out the computer name in some rules.

The rules makes False alerts with the computer name as user name.

How exactely can i do that ?

Thanks in advance 

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Rule (I) : Member added to an administrative group


Member DOMAIN\JCT_Level_1_Support added to group Builtin\Administrators by DOMAIN\ELEC-403-111$.

Alert was generated on computer ELEC-403-111.DOMAIN.COM.

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Rule (I) : Change Password Attempt on Administrative Account


There was administrative account password change attempt by DOMAIN\LAU106-54-90$ user. Target account: LAU106-54-90\admin.

Alert was generated on computer LAU106-54-90.DOMAIN.COM.

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Rule (A) : User Account enabled by unauthorized personnel


Account T-LEC-9205\Ladmin enabled by DOMAIN\T-LEC-9205$.

Alert was generated on computer t-lec-9205.DOMAIN.COM

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Rule (A) : Multiple failed logons by the same user


There were 5 failed logons by user ADMIN\SAFECOM-LEV-ADM$ from workstation SAFECOM-LEV-ADM.

Alert was generated on computer p-baruch.DOMAIN.COM.

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