What filter is this?

[Ofnuts]

I would do it that way:

1. Create the plain yellow layer with the while lines
   
2. Add a layer
   
3. Set foreground color to a darker yellow
   
4. Set gradient to "FG to transparent"
   
5. Using the gradient tool, set to shape: "Bilinear", "Repeat: triangle", draw a pattern of slanted lines (4-5px apart)
   
6. Set that layer to "Dissolve" mode, and reduce opacity to taste
   
7. For added effect (not shown below) you can duplicate the lines layer and flip it