Attention: We have transitioned to a new AAD or Microsoft Entra ID from the week of May 20, 2024. In case your tenant requires admin consent, please refer to this document located at Overview of user and admin consent - Microsoft Entra ID | Microsoft Learn and grant access to App ID: 6ba09155-cb24-475b-b24f-b4e28fc74365 with graph permissions for Directory.Read.All and User.Read for continued access. While the app may appear unverified, you can confirm its legitimacy by verifying the App ID provided.

We're gradually updating threat actor names in our reports to align with the new weather-themed taxonomy. Learn about Microsoft threat actor names

Published Sep 26, 2011 | Updated Sep 15, 2017

Learn about other threats

TrojanDownloader:Java/OpenConnection.OS

Detected by Microsoft Defender Antivirus

Aliases: No associated aliases

Summary

TrojanDownloader:Java/OpenConnection.OS is a Java applet trojan that may allow the downloading and execution of arbitrary malicious files.

To detect and remove this threat and other malicious software that may be installed on your computer, run a full-system scan with an appropriate, up-to-date, security solution. The following Microsoft products detect and remove this threat:

For more information on antivirus software, see http://www.microsoft.com/windows/antivirus-partners/.

Update vulnerable applications

This threat may exploit a known vulnerability in the Java Runtime Environment (JRE). To prevent your computer from being vulnerable to this malware, make sure that you install the updates available from the vendor. You can read more about this vulnerability from the following links:

TrojanDownloader:Java/OpenConnection.OS

Summary

What to do now

Update vulnerable applications

Technical information

Threat behavior

Installation

Payload

Prevention

Symptoms

System changes