diff --git a/clusters/threat-actor.json b/clusters/threat-actor.json
index f18181b0..f4d6886c 100644
--- a/clusters/threat-actor.json
+++ b/clusters/threat-actor.json
@@ -2175,7 +2175,8 @@
           "https://www.us-cert.gov/sites/default/files/publications/AR-17-20045_Enhanced_Analysis_of_GRIZZLY_STEPPE_Activity.pdf",
           "https://www.fireeye.com/blog/threat-research/2017/03/dissecting_one_ofap.html",
           "https://www.cfr.org/interactive/cyber-operations/dukes",
-          "https://pylos.co/2018/11/18/cozybear-in-from-the-cold/"
+          "https://pylos.co/2018/11/18/cozybear-in-from-the-cold/",
+          "https://cloudblogs.microsoft.com/microsoftsecure/2018/12/03/analysis-of-cyberattack-on-u-s-think-tanks-non-profits-public-sector-by-unidentified-attackers/"
         ],
         "synonyms": [
           "Dukes",
@@ -2193,7 +2194,8 @@
           "The Dukes",
           "Minidionis",
           "SeaDuke",
-          "Hammer Toss"
+          "Hammer Toss",
+          "YTTRIUM"
         ]
       },
       "related": [