---
title: "Microsoft sues to disrupt Fox Tempest malware-signing service, seizes signspace.cloud"
type: "News"
locale: "en"
url: "https://longbridge.com/en/news/286946141.md"
description: "Microsoft has filed a lawsuit against Fox Tempest, a malware-signing service, in the US District Court for the Southern District of New York. The lawsuit aims to disrupt operations that misuse Microsoft code-signing tools, which have been linked to ransomware attacks on critical organizations. Microsoft has seized the signspace.cloud website and taken offline numerous virtual machines. The complaint also implicates Vanilla Tempest as a co-conspirator in these activities."
datetime: "2026-05-19T16:42:01.000Z"
locales:
  - [zh-CN](https://longbridge.com/zh-CN/news/286946141.md)
  - [en](https://longbridge.com/en/news/286946141.md)
  - [zh-HK](https://longbridge.com/zh-HK/news/286946141.md)
---

# Microsoft sues to disrupt Fox Tempest malware-signing service, seizes signspace.cloud

-   Microsoft unsealed a lawsuit in the US District Court for the Southern District of New York targeting Fox Tempest, a malware-signing-as-a-service operation accused of abusing Microsoft code-signing tools since May 2025. \* The case seeks to disrupt infrastructure used to make malware appear legitimate, a capability tied to ransomware and other intrusions that Microsoft said compromised networks worldwide. \* Microsoft seized the signspace (.) cloud website, took offline hundreds of virtual machines, blocked access to a site hosting underlying code. \* The complaint also names Vanilla Tempest as a co-conspirator, linking the service to ransomware campaigns that hit schools, hospitals, and other critical organizations. \* Microsoft said it has observed Fox Tempest attempting to shift customers to another code-signing service as disruption efforts intensified. Disclaimer: This news brief was created by Public Technologies (PUBT) using generative artificial intelligence. While PUBT strives to provide accurate and timely information, this AI-generated content is for informational purposes only and should not be interpreted as financial, investment, or legal advice. Microsoft Corporation published the original content used to generate this news brief on May 19, 2026, and is solely responsible for the information contained therein. © Copyright 2026 - Public Technologies (PUBT) Original Document: here

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