I've made this a couple of times, and though it isn't a clone since we had never had a Zombie Dust prior to making this, it is probably a solid starting point. The IBUs may be low compared to ZD and this has less alcohol.
Amount Item Type % or IBU
5.00 lb Pale Malt (2 Row) US (2.0 SRM) Grain 48.78 %
4.00 lb Pale Malt (2 Row) UK (3.0 SRM) Grain 39.02 %
0.50 lb Caramel/Crystal Malt - 20L (20.0 SRM) Grain 4.88 %
0.50 lb Munich Malt - 20L (20.0 SRM) Grain 4.88 %
0.25 lb Victory Malt (25.0 SRM) Grain 2.44 %
0.25 oz Citra [13.40 %] (60 min) Hops 11.7 IBU
2.00 oz Citra [13.40 %] (Dry Hop 3 days) Hops -
1.00 oz Citra [13.40 %] (15 min) Hops 23.3 IBU
1.00 oz Citra [13.40 %] (0 min) Hops -
1 Pkgs American Ale (Wyeast Labs #1056) Yeast-Ale
Est Original Gravity: 1.049 SG
Measured Original Gravity: 1.010 SG Est Final Gravity: 1.012 SG
Estimated Alcohol by Vol: 4.81 %
Bitterness: 35.0 IBU
Est Color: 6.8 SRM