ensuring-customers-are-protected-from-solorigate
Microsoft Security Blog

Ensuring customers are protected from Solorigate

Microsoft is monitoring a dynamic threat environment surrounding the discovery of a sophisticated attack that included compromised binaries from a legitimate software. These binaries, which are related to the SolarWinds Orion Platform, could be used by attackers to remotely access devices. On Sunday, December 13, Microsoft released detections that alerted customers to the presence of these malicious binaries, with the recommendation to isolate and investigate the devices.

It is important to understand that these binaries represent a significant threat to customer environments. Customers should consider any device with the binary as compromised and should already be investigating devices with this alert. Starting on Wednesday, December 16 at 8:00 AM PST, Microsoft Defender Antivirus will begin blocking the known malicious SolarWinds binaries. This will quarantine the binary even if the process is running. We also realize this is a server product running in customer environments, so it may not be simple to remove the product from service. Nevertheless, Microsoft continues to recommend that customers isolate and investigate these devices:

  1. Immediately isolate the affected device. If malicious code has been launched, it is likely that the device is under complete attacker control.
  2. Identify the accounts that have been used on the affected device and consider these accounts compromised. Reset passwords or decommission the accounts.
  3. Investigate how the affected endpoint might have been compromised.
  4. 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.

If service interruption is not possible, customers must take the action below to exclude SolarWinds binaries. This should be a temporary change that you should revert as soon as you update binaries from the provider or complete your investigation.

 

For Microsoft Defender Antivirus via GPO Instructions:

PATH: Computer Configuration > Administrative Templates > Windows Components > Microsoft Defender Antivirus (or Windows Defender Antivirus) > Threats > Specify threat alert levels at which default action should not be taken when detected.

Value name: 2147771206

Value: 6

 

For SCEP via GPO instructions:

PATH: Computer Configuration > Administrative Templates > Windows Components > Endpoint Protection > Threats > Specify threat alert levels at which default action should not be taken when detected.

Value name: 2147771206

Value: 6

Note: If you don’t see the “Endpoint Protection” section, see: Manage Endpoint Protection using Group Policies – Configuration Manager | Microsoft Docs

 

For Microsoft Defender Antivirus and SCEP via SCCM Instructions:

PATH: Assets and Compliance, Endpoint Protection > Antimalware Policies > Threat overrides > Enter Threat name: Trojan:MSIL/Solorigate.BR!dha

PATH: Assets and Compliance, Endpoint Protection > Antimalware Policies >