Get-ADUser - "memberof" value returns DN

I am not not an expert in scripting. I have a simple powershell script. I can extract "memberof" attribute value but the value is in a DN. I want only group names to be exported. Someone please help me to edit below script. Thanks.

Get-ADUser -Filter * -SearchBase "DC=QA,DC=ABC" -Properties cn, samaccountname, givenName, middlename, sn, mail,memberof | Foreach-Object {

    New-Object -TypeName PSObject -Property @{
        System_Role = "NONE"
    External_Person_Key = $_.cn
    User_ID = $_.samAccountName
    Passwd = "I2u4fuNt"
    FirstName = $_.givenName
    MiddleName = $_.middleName
    LastName = $_.sn
    Email = $_.mail
    memberof = $_.memberof
    } | Select-Object System_Role, External_Person_Key, User_ID, Passwd, FirstName , MiddleName, LastName, Email, memberof         
} | Export-Csv -Path "E:\result.csv"