September 27, 2023

For a subset of compromised accounts, the attackers used AzureHound and ROADtools, two open-source frameworks that can be utilized to conduct reconnaissance in Microsoft Entra ID (previously Azure Energetic Listing) environments by interacting with the Microsoft Graph and REST APIs with the objective of exfiltrating information of curiosity from a sufferer’s cloud account.

“AzureHound and Roadtools have performance that’s utilized by defenders, purple groups, and adversaries,” Microsoft stated in its report. “The identical options that make these instruments helpful to professional customers, like pre-built capabilities to discover and seamlessly dump information in a single database, additionally make these instruments engaging choices for adversaries looking for details about or from a goal’s atmosphere.”

To attain persistence, the attackers arrange new Azure subscriptions on victims’ tenants, which had been used to ascertain command-and-control communication with infrastructure operated by the group. Additionally they put in the Azure Arc shopper on units in compromised environments and related it to an Azure subscription they managed, giving them distant management capabilities over these units. Azure Arc is a functionality that enables the distant administration of Home windows and Linux techniques in an Azure AD atmosphere.

Different post-compromise instruments and strategies

After attaining persistence, the Peach Sandstorm attackers deployed quite a lot of publicly obtainable and customized instruments, together with AnyDesk, a business distant monitoring and administration (RMM) device, and EagleRelay, a customized site visitors tunneling device that the attackers deployed on newly created digital machines in sufferer environments.

Different strategies employed by the group embrace abuse of the distant desktop protocol (RDP), executing malicious code by performing DLL hijacking with a professional VMWare executable and launching a Golden SAML assault.

“In a Golden SAML assault, an adversary steals personal keys from a goal’s on-premises Energetic Listing Federated Providers (AD FS) server and makes use of the stolen keys to mint a SAML token trusted by a goal’s Microsoft 365 atmosphere,” Microsoft stated. “If profitable, a risk actor may bypass AD FS authentication and entry federated providers as any consumer.”