diff --git a/elements/adversary-groups.json b/elements/adversary-groups.json
index 7411d6e4..6afab4b1 100644
--- a/elements/adversary-groups.json
+++ b/elements/adversary-groups.json
@@ -89,7 +89,8 @@
     "Dropping Elephant",
     "Operation Transparent Tribe",
     "Poseidon Group",
-    "DragonOK"
+    "DragonOK",
+    "Threat Group-3390"
   ],
   "details": [
     {
@@ -890,6 +891,12 @@
        "synonyms": [
         "Moafee"
         ]
+     },
+     {
+       "group": "Threat Group-3390",
+       "description": "Chinese threat group that has extensively used strategic Web compromises to target victims.",
+       "country": "CN",
+       "refs": ["http://www.secureworks.com/cyber-threat-intelligence/threats/threat-group-3390-targets-organizations-for-cyberespionage/", "https://attack.mitre.org"]
      }
   ]
 }