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Published Dec 12, 2020 | Updated Mar 11, 2021


Detected by Microsoft Defender Antivirus

Aliases: No associated aliases


This threat can allow remote sophisticated attackers to gain access and perform backdoor commands on an affected device. It is a modified DLL component of a legitimate software.

When the related software is opened, this modified DLL is loaded and connects to command-and-control servers to listen for commands and get additional payloads.

Microsoft Defender Antivirus detects and blocks this threat. It will quarantine the binary even if the process is running.

NOTE: Microsoft continues to work with partners and customers to expand our knowledge of the threat actor behind the nation-state cyberattacks that compromised the supply chain of SolarWinds and impacted multiple other organizations. Microsoft previously used ‘Solorigate’ as the primary designation for the actor, but moving forward, we want to place appropriate focus on the actors behind the sophisticated attacks, rather than one of the examples of malware used by the actors. Microsoft Threat Intelligence Center (MSTIC) has named the actor behind the attack against SolarWinds, the SUNBURST backdoor, TEARDROP malware, and related components as NOBELIUM. As we release new content and analysis, we will use NOBELIUM to refer to the actor and the attack campaigns.

For more information and guidance from Microsoft, read the following:

Microsoft Defender Antivirus automatically removes threats as they are detected. If you have cloud-delivered protection, your device gets the latest defenses against new and unknown threats. If you don't have this feature enabled, update your antimalware definitions and run a full scan to remove this threat.

To help reduce the impact of this threat, you can:

  • Immediately isolate the affected device. If malicious code has been launched, it is likely that the device is under complete attacker control.
  • Identify the accounts that have been used on the affected device and consider these accounts compromised. Reset passwords or decommission the accounts.
  • Investigate how the affected endpoint might have been compromised. Check web and email traffic to determine how the malware arrived.
  • Investigate the device timeline for indications of lateral movement activities using one of the compromised accounts. Check for additional tools that attackers might have dropped to enable credential access, lateral movement, and other attack activities.

You can also visit our advanced troubleshooting page or search the Microsoft community for more help.

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