I need help!

I am trying to use a paste special that works when an input in my spreadsheet is changed, but for some reason I get into an iterative loop and then crash excel. Can someone tell me why this code doesn't work? And possibly offer suggestions.

Private Sub Worksheet_Change(ByVal Target As Range)

    Dim KeyCells As Range

    Set KeyCells = Range("c7:c17")
    
    If Not Application.Intersect(KeyCells, Range(KeyCells.Address)) _
           Is Nothing Then
        
    Range("H36").Select
    Selection.Copy
    Range("C26").Select
    Selection.PasteSpecial Paste:=xlPasteValues, Operation:=xlNone, SkipBlanks _
        :=False, Transpose:=False
    Range("F26").Select
    Application.CutCopyMode = False
        
        
        MsgBox ("it worked")
        
    End If
End Sub

This line:

If Not Application.Intersect(KeyCells, Range(KeyCells.Address)) _
Is Nothing Then

should presumably be

If Not Application.Intersect(KeyCells, Target) Is Nothing Then

since it serves no purpose at the moment.