diff --git a/elements/threat-actor-tools.json b/elements/threat-actor-tools.json
index fc9a8b4..321008e 100644
--- a/elements/threat-actor-tools.json
+++ b/elements/threat-actor-tools.json
@@ -444,6 +444,10 @@
     {
       "value": "Helminth backdoor",
       "refs": ["http://researchcenter.paloaltonetworks.com/2016/05/the-oilrig-campaign-attacks-on-saudi-arabian-organizations-deliver-helminth-backdoor/"]
+    },
+    {
+      "value": "HDRoot",
+      "refs": ["http://williamshowalter.com/a-universal-windows-bootkit/"]
     }
   ],
   "version" : 1,