Umbra Loader

Posted: November 16, 2012

Umbra Loader Description

The Umbra Loader is a Do-It-Yourself kit for creating botnets – networks of Umbra-infected PCs that are exploited to conduct additional attacks like stealing confidential information, installing other malware or crashing websites with Denial-of-Service attacks. Because the Umbra Loader uses a series of optional modules for its attacks, specific Umbra Loader infections can display a range of different behaviors, although all Umbra Loader infections should be considered malicious. malware researchers have taken particular notice of recent Umbra Loader attacks that have used fake greeting cards that are distributed by e-mail spam. If you've opened up an unexpected digital card, your PC may be infected by a variant of the Umbra Loader, and you should use good anti-malware products to find and remove the Umbra Loader as quickly as is practical.

When a Greeting Card Says Hello by Attacking Your PC

An example of a widely distributed attack wave by the Umbra Loader has used social networking techniques that cause victims to install the Umbra Loader under the misapprehension that the Umbra Loader is a benign program or file. E-mail messages that appear to distribute greeting cards actually include links to Umbra Loader installers alongside real links to, which malware experts note is a site that's not affiliated with malware distribution (although it does have a history associated with spam-related activities).

Similar websites also may be used as covers for Umbra Loader's spam e-mail messages, with other examples of exploited brands including Hallmark, Regards and American Greetings. If you do need to navigate to a website like one of these, malware researchers suggest that you navigate to the URL manually instead of clicking an e-mail link that may lead you to a different destination or launch a malicious file (such as the Umbra Loader's installer).

The main danger in any variant of the Umbra Loader is its ability to create backdoor vulnerabilities. These vulnerabilities allow criminals to control your PC and may be complicit in attacks such as:

  • Changes to your browser's settings that cause browser redirects and other attacks.
  • Efforts to steal confidential data (passwords, e-mail addresses, banking info).
  • Blocked applications related to your computer's security (such as Task Manager).
  • The installation of malware like ransomware Trojans that display fake crime alerts, rogue defraggers that fake scans of your hard drive or adware programs that display advertisements without your permission.

Cutting Off Your Strands of the Umbra Loader's Web

Like any botnet-based program, Umbra Loader tries to avoid detection and may use large amounts of your PC's resources to conduct its attacks. Because the Umbra Loader's functionality-specific modules can be attached or abolished at will, many of Umbra Loader's attacks can vary from those of a similar Umbra Loader-based infection. Also, because of this modular design philosophy, Umbra Loader usually includes other types of malware in its installation, all of which should be detected and deleted by anti-malware software.

Besides being security risks, botnet attacks like those used by the Umbra Loader also may harm your computer's performance due to the constant resource usage that they may require. Malware associated with the Umbra Loader may or may not be identified by its name; for instance, Trojan-Downloader.Win32.Umbald, Backdoor.Agobot and Backdoor:Win32/Umbra all are associated with the Umbra Loader. Since Umbra Loader-related infections don't show symptoms and can create sweeping system changes, malware analysts discourage any means other than analysis by anti-malware software for deleting an Umbra Loader infection.

Use SpyHunter to Detect and Remove PC Threats

If you are concerned that malware or PC threats similar to Umbra Loader may have infected your computer, we recommend you start an in-depth system scan with SpyHunter. SpyHunter is an advanced malware protection and remediation application that offers subscribers a comprehensive method for protecting PCs from malware, in addition to providing one-on-one technical support service.

Download SpyHunter's Malware Scanner

Note: SpyHunter's free version is only for malware detection. If SpyHunter detects malware on your PC, you will need to purchase SpyHunter's malware tool to remove the malware threats. Learn more on SpyHunter. If you would like to uninstall SpyHunter for any reason, please follow these uninstall instructions. To learn more about our policies and practices, visit our EULA, Privacy Policy and Threat Assessment Criteria.

Why can't I open any program including SpyHunter? You may have a malware file running in memory that kills any programs that you try to launch on your PC. Tip: Download SpyHunter from a clean computer, copy it to a USB thumb drive, DVD or CD, then install it on the infected PC and run SpyHunter's malware scanner.

Leave a Reply

Please note that we are not able to assist with billing and support issues regarding SpyHunter or other products. If you're having issues with SpyHunter, please get in touch with SpyHunter customer support through your SpyHunter. If you have SpyHunter billing questions, we recommend you check the Billing FAQ. For general suggestions or feedback, contact us.