Antino is a Windows backdoor that Cisco Talos tracks as part of activity designated UAT-11587. A Cyber Security News report dated October 1, 2026, describing Talos’s findings, says the malware uses Microsoft Graph as a native command-and-control channel: Outlook carries commands and replies, while OneDrive supports status reporting and file movement. That is abuse of legitimate Microsoft services—not evidence that Microsoft 365 itself was compromised or that ordinary Graph traffic is malicious.
What Antino and UAT-11587 mean
Antino is the reported name of the backdoor; UAT-11587 is Cisco Talos’s tracking designation for the activity. Talos’s listing, dated September 17, 2026, identifies activity targeting government and policy organizations across Asia and says a previously undocumented backdoor was found in developer artifacts. The more detailed technical and campaign description below comes from Cyber Security News’s October 1, 2026 report, which attributes its account to Talos.
According to that report, the campaign began in September 2025 and targeted government, defense, diplomatic, academic, and policy organizations. Talos assessed links to China with high confidence; this is an attributed assessment, not an independently established conclusion here. By July 2026, Talos had identified approximately 350 compromised endpoints across eight countries, according to the report. It also describes 10 confirmed and five probable affected institutional environments, plus one intended target. These are investigation figures with that stated cutoff, not a complete count of all victims or proof that every organization in the listed sectors was affected.
How Microsoft 365 fits into Antino’s command channel
The reported design uses Microsoft Graph to reach Microsoft 365 services after installation. In newer Antino versions, the report says the malware authenticates using stored credentials for an Entra ID application, rather than requiring a user to sign in interactively. It then checks an attacker-controlled Outlook mailbox every 10 seconds, according to the same report.
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| Microsoft 365 component | Reported role in Antino’s workflow |
|---|---|
| Outlook mailbox | Receives attacker commands and carries the malware’s replies. |
| OneDrive | Supports registration and status updates, stolen-file storage, and staging attacker tools. |
| Microsoft Graph | Provides the API interface through which the reported malware accesses those services. |
This arrangement can make command traffic appear among activity to familiar cloud services, but the service domain alone cannot tell an investigator whether a particular request is malicious. The relevant question is whether the identity, application, mailbox, files, and endpoint behavior fit an authorized pattern for that organization.
How the reported infection chain works
The report describes tailored phishing and fake installers as delivery methods. One recurring chain combines several stages; it should not be mistaken for a claim that every infection followed exactly the same sequence.
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- A target is approached with tailored phishing or a fake installer.
- Windows scripting components launch encrypted JavaScript.
- The chain processes .NET objects unsafely and uses an in-memory downloader.
- A DLL is side-loaded beside a signed Microsoft executable to run the malicious code.
The initial delivery infrastructure and the later Microsoft 365 command channel are distinct parts of the reported operation. Seeing Microsoft service traffic does not by itself identify how a machine was infected, and the delivery chain should be investigated separately from post-installation cloud activity.
What the backdoor can do
Cyber Security News reports that Antino is written in Rust and exists in executable and library forms. Its reported capabilities include:
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- Inspecting system information.
- Running shell and PowerShell commands.
- Transferring files and executing programs.
- Loading additional code.
The report also describes an optional concealment feature that encrypts a secondary payload while it sleeps. That is not the same as hiding the entire Antino process, and it does not guarantee evasion of security controls.
What defenders should correlate
Investigate related evidence across identity, cloud services, and the Windows endpoint rather than treating any one Microsoft domain or event as conclusive. The areas below reflect the behaviors described in the report; they are investigative leads, not a replacement for the full, current detection guidance from Cisco Talos.
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- Identity and application activity: Check Entra ID application sign-ins, the application’s credentials and permissions, and whether its access matches an approved business purpose. An app-based sign-in without an interactive user login may be expected in some environments; assess it in context.
- Mailbox behavior: Review unusual mailbox access, message patterns, and the relationship between mailbox activity and the application identity.
- OneDrive activity: Examine unexpected status or registration data, file uploads or downloads, and tool staging, especially when associated with an unfamiliar application or endpoint.
- Endpoint execution: Correlate scripting activity, encrypted JavaScript, unsafe .NET object processing, in-memory downloads, DLL side-loading, persistence, and unexpected file creation.
- Other corroboration: Compare findings with the source report’s hashes, filenames, infrastructure, detection signatures, and network rules, using the latest available set and your own telemetry.
The report explicitly identifies graph.microsoft.com and login.microsoftonline.com as legitimate Microsoft service domains. Their appearance in network logs is not independent evidence of compromise and is not, by itself, a sound reason to block ordinary Microsoft service access. Use the associated identity, endpoint, and file evidence to decide whether activity is suspicious.
Sources and scope
Cisco Talos’s September 17, 2026 listing, “China-nexus UAT-11587 targets government and policy organizations across Asia with Antino backdoor,” confirms the activity designation, target focus, and malware name. The detailed behaviors and figures in this article are attributed to Tushar Subhra Dutta’s October 1, 2026 Cyber Security News report, “Hackers Built a Windows Backdoor Whose Entire C2 Lives Inside Microsoft 365,” which summarizes Talos’s findings. The distinction matters: campaign counts, attribution, and technical mechanisms here reflect that report’s account of Talos’s investigation.
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