diff --git a/objects/c2-list/definition.json b/objects/c2-list/definition.json
new file mode 100644
index 0000000..bc2e6ed
--- /dev/null
+++ b/objects/c2-list/definition.json
@@ -0,0 +1,50 @@
+{
+  "attributes": {
+    "c2-ip": {
+      "categories": [
+        "Network activity"
+      ],
+      "description": "IP of C2 server with unknown port",
+      "misp-attribute": "ip-src",
+      "multiple": true,
+      "ui-priority": 1
+    },
+    "c2-ipport": {
+      "categories": [
+        "Network activity"
+      ],
+      "description": "IP:Port of C2 server",
+      "misp-attribute": "ip-src|port",
+      "multiple": true,
+      "ui-priority": 1
+    },
+    "report-url": {
+      "description": "URL of source of information, e.g. blog post, ransomware analysis",
+      "disable_correlation": true,
+      "misp-attribute": "link",
+      "multiple": true,
+      "ui-priority": 1
+    },
+    "threat": {
+      "categories": [
+        "Attribution",
+        "Payload type"
+      ],
+      "description": "threat actor or malware",
+      "misp-attribute": "text",
+      "ui-priority": 1
+    }
+  },
+  "description": "List of C2-servers with common ground, e.g. extracted from a blog post or ransomware analysis",
+  "meta-category": "network",
+  "name": "c2-list",
+  "required": [
+    "threat"
+  ],
+  "requiredOneOf": [
+    "c2-ipport",
+    "c2-ip"
+  ],
+  "uuid": "12456351-ceb7-4d43-9a7e-d2275d8b5785",
+  "version": 20230919
+}
\ No newline at end of file
diff --git a/objects/user-account/definition.json b/objects/user-account/definition.json
index 561c2c2..5bbe8c9 100644
--- a/objects/user-account/definition.json
+++ b/objects/user-account/definition.json
@@ -55,6 +55,12 @@
       "misp-attribute": "text",
       "ui-priority": 1
     },
+    "email": {
+      "description": "Email addresses for the account.",
+      "misp-attribute": "email",
+      "multiple": true,
+      "ui-priority": 1
+    },
     "expires": {
       "description": "Expiration time of the account",
       "disable_correlation": true,