Was Microsoft hit by ransomware?

Microsoft was listed by the ExfilSquad ransomware operation (United States), and stolen data was published on the group's leak site. Darkfield tracks this disclosure with the original leak post, screenshot and group context.

Who is the ExfilSquad ransomware group?

ExfilSquad is a ransomware operator tracked by Darkfield. See the full operator dossier for its known victims, sectors targeted, IOCs and leak-site infrastructure.

What data was leaked in the Microsoft breach?

ExfilSquad published data attributed to Microsoft. Darkfield captured the leak post and a screenshot of the listing.

Ransomware victim disclosure

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Microsoft

Claimed by ExfilSquad · listed 3 days ago

Age

since listed · data leaked

Status timeline

ListedJul 26, 2026
Data leakeddate unknown

At a glance

Group: ExfilSquad
Status: Data leaked
Country: United States
Sector: Technology
Listed on leak site: Jul 26, 2026

About the victim

AI dossier — public-source company profile

Microsoft Corporation is a multinational technology company headquartered in Redmond, Washington, with annual revenue of approximately $318 billion. The company develops and sells software, cloud services, and hardware products including Windows, Office 365, Azure, and Xbox to consumers and enterprises globally.

Industry: Cloud Computing, Software & Enterprise Services
Founded: 1975

Attack summary

Severity: critical — Claimed exfiltration of 8 million records including PII at massive scale, authentication credentials, password hashes, and internal access data from a major technology company serving hundreds of millions of users globally. Exposure of this scope and sensitivity poses systemic risk to Microsoft's customers and operations.

ExfilSquad claims to have exfiltrated approximately 8 million records from Microsoft containing significant personally identifiable information, employee and customer contact data, authentication credentials, password hashes, portal identities, corporate accounts, business leads, facilities records, service tickets, and access permissions.

critical

Data the group says was taken

AI dossier — extracted from the leak post

PII (personally identifiable information)
employee contact information
customer contact information
authentication data
password hashes
portal identities
corporate account information
business leads
facilities management records
internal service tickets
access permissions

What the group claims

Revenue: $318B DATA SUMMARY: 8M~ records containing: significant PII, employee and customer contact information, authentication data, password hashes, portal identities, corporate account information, business leads, facilities management records, internal service tickets, and access permissions.

Sources

Victim sitemicrosoft.com

Source

Indexed 3 days ago

This page surfaces a public ransomware disclosure indexed by Darkfield. Original posts come from the operator's own leak site; we cross-check against ransomware.live, RansomLook and RansomWatch where applicable. Share this URL freely.

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Disclosure context

About ExfilSquad

ExfilSquad is a relatively nascent ransomware group first observed in July 2026 with a confirmed victim count of 14, operating with an apparent financial motivation consistent with contemporary cybercriminal ransomware operations. The group's country of origin and potential affiliations with known threat actor clusters or ransomware-as-a-service ecosystems have not yet been publicly attributed by CISA, FBI, Mandiant, or other reputable security research organizations, and details regarding their operational infrastructure remain limited in open-source reporting. Based on observed targeting patterns, ExfilSquad has demonstrated a preference for high-value sectors including Government and Defense, Technology, Financial Services, Education, and Transportation, with victim organizations concentrated primarily in the United States and Great Britain, and additional targeting observed in Sweden and Nigeria, suggesting a financially motivated group comfortable operating across multiple jurisdictions rather than one with a narrowly defined geopolitical focus. Given the group's recent emergence and relatively limited victim count, detailed technical indicators regarding their specific initial access vectors, tooling, encryption implementation, or use of double-extortion data leak sites have not been comprehensively documented in publicly available threat intelligence reporting at this time. As of the time of this profile, no significant law enforcement actions, disruptions, or confirmed rebranding activity associated with ExfilSquad have been publicly disclosed, and the group should be considered potentially active given the recency of their first observed activity. The group has been linked to 15 public disclosures across our corpus. First observed on a leak site on July 26, 2026. The operation is currently active.

Timeline of this disclosure

July 26, 2026Microsoft listed by ExfilSquadon the group's public leak site

Other recent disclosures by ExfilSquad

ExfilSquad has been linked to 15 public victims on Darkfield. A sample of the most recent:

See the full ExfilSquad dossier →

Sector and geography

This disclosure adds to ransomware activity in the Technology sector, which has 3,563 disclosures indexed across all operators we track. Geographically, Microsoft is reported in United States, a country with 3,138 ransomware disclosures in our corpus.

If your organisation is affected

A listing by ExfilSquad means Microsoft appeared on a ransomware extortion site and data attributed to it has been published. If this is your organisation, or a supplier you depend on, the priority is to confirm the intrusion and contain it before the window to act closes.

Engage your incident-response team and preserve forensic evidence before remediating — do not wipe affected systems first.
Force a password reset and revoke active sessions for exposed accounts; rotate any credentials, API keys or certificates that may have been in the stolen data.
Assess regulatory notification duties (GDPR, NIS2, sector regulators) — many carry a 72-hour reporting clock from awareness.
Report the incident to your national CERT, CISA (United States), as required for your jurisdiction.
Monitor for the data appearing on ExfilSquad's leak site and across paste and breach channels, and brief downstream partners who may be exposed through you.

How we know this. Darkfield monitors public ransomware leak sites continuously, archiving every new disclosure and the data later released against the victim. Each entry on this page is sourced from the operator's own publication and cross-checked against complementary OSINT feeds (RansomLook, ransomware.live, RansomWatch). We do not collect or host stolen data — only the metadata, timestamps and screenshots needed to make the public disclosure searchable and accountable. Records here are corrected when the original post is edited, retracted, or merged with another disclosure.