diff --git a/packages/safe-chain/src/registryProxy/interceptors/interceptorBuilder.js b/packages/safe-chain/src/registryProxy/interceptors/interceptorBuilder.js
index e25e641..7a844e9 100644
--- a/packages/safe-chain/src/registryProxy/interceptors/interceptorBuilder.js
+++ b/packages/safe-chain/src/registryProxy/interceptors/interceptorBuilder.js
@@ -20,6 +20,12 @@ import { EventEmitter } from "events";
  * @property {(headers: NodeJS.Dict<string | string[]> | undefined) => NodeJS.Dict<string | string[]> | undefined} modifyRequestHeaders
  * @property {() => boolean} modifiesResponse
  * @property {(body: Buffer, headers: NodeJS.Dict<string | string[]> | undefined) => Buffer} modifyBody
+ *
+ * @typedef {Object} MalwareBlockedEvent
+ * @property {string} packageName
+ * @property {string} version
+ * @property {string} targetUrl
+ * @property {number} timestamp
  */
 
 /**
diff --git a/packages/safe-chain/src/registryProxy/registryProxy.js b/packages/safe-chain/src/registryProxy/registryProxy.js
index 6f11207..497def8 100644
--- a/packages/safe-chain/src/registryProxy/registryProxy.js
+++ b/packages/safe-chain/src/registryProxy/registryProxy.js
@@ -137,9 +137,14 @@ function handleConnect(req, clientSocket, head) {
 
   if (interceptor) {
     // Subscribe to malware blocked events
-    interceptor.on("malwareBlocked", (event) => {
-      onMalwareBlocked(event.packageName, event.version, event.url);
-    });
+    interceptor.on(
+      "malwareBlocked",
+      (
+        /** @type {import("./interceptors/interceptorBuilder.js").MalwareBlockedEvent} */ event
+      ) => {
+        onMalwareBlocked(event.packageName, event.version, event.targetUrl);
+      }
+    );
 
     mitmConnect(req, clientSocket, interceptor);
   } else {