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Marlborough Partners

Claimed by Anubis · listed 3 days ago

2d
Age
since listed · data leaked

Status timeline

  1. ListedSep 2, 2026
  2. Data leakeddate unknown

At a glance

Group
Anubis
Status
Data leaked
Country
United Kingdom
Sector
Financial Services
Listed on leak site
Sep 2, 2026

About the victim

AI dossier — public-source company profile

Marlborough Partners is a capital solutions advisor in Europe providing independent advisory services to private equity, corporate, and public clients. The firm has raised over €56 billion across 373 transactions and offers services including capital raising, financial modeling, and capital structuring.

Industry
Financial Services & Capital Advisory

Attack summary

Severity: critical — Confirmed exfiltration of sensitive financial data at scale, including regulated KYC records, personal identity documents, and confidential client financial information from a capital advisory firm with access to deal-level intelligence affecting multiple clients. High risk of secondary social engineering attacks and financial fraud.

The anubis group claims to have exfiltrated data from Marlborough Partners' systems. The leaked data includes client financial information, deal documentation, capital raise details, investor records, KYC documents, client and investor databases, and identity documents.

critical

Data the group says was taken

AI dossier — extracted from the leak post
  • Client financial information
  • Deal documentation
  • Capital raise records
  • Investor details
  • KYC records
  • Client databases
  • Investor databases
  • Identity documents

What the group claims

Major data breach at a capital solutions advisory firm.

The leak post

captured from the group's site
is a leading capital solutions advisor in Europe, providing independent and conflict-free advice to private equity, corporate, and public clients. With a strong track record, the firm has raised over €56 billion across 373 transactions, offering a wide range of advisory services including capital raising, financial modeling, and capital structuring.
Well, since this company helps other businesses raise capital, it inevitably has access to far more information about its clients than most other business service providers. And much of that information is, of course, something clients would never want to see made public.
Now they will have to do some serious work to assess the risks created by this breach and take the necessary steps to contain the damage. If the exposure of some information will merely cost management and clients a few sleepless nights, other data could have consequences that are far more serious.
You will find a wide range of client financial information, documents related to various deals, details on capital raised and investors, KYC records, and much more.
But all of that is only what lies on the surface. Given the sheer volume of data, there is likely much more to…

Sources

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 anubis

Anubis is a recently emerged ransomware group that began operations in February 2025, primarily motivated by financial gain through encryption and extortion attacks. The group has demonstrated rapid expansion, accumulating 65 documented victims within a short operational timeframe. Given the group's recent emergence, limited information is publicly available regarding their specific country of origin, organizational structure, or confirmed affiliations with other cybercriminal entities, though their operational patterns suggest they may operate as an independent group or small-scale ransomware-as-a-service operation. Their attack methodology appears to focus on opportunistic targeting across multiple geographic regions, with victims concentrated primarily in the United States, Australia, Canada, the United Kingdom, and France, indicating either English-language proficiency or the use of automated tools that facilitate cross-border operations. The group demonstrates a clear preference for targeting healthcare organizations and manufacturing companies, followed by business services and technology sectors, suggesting they prioritize organizations with critical operational dependencies that may be more likely to pay ransoms quickly. Due to the group's recent emergence in early 2025, there is insufficient publicly documented information from established cybersecurity firms or law enforcement agencies regarding their specific technical capabilities, encryption methods, or whether they employ double or triple extortion tactics involving data theft and leak sites. As of current reporting, Anubis remains an active threat with continued victim acquisition, though the full scope of their capabilities and long-term operational sustainability remains to be determined as security researchers continue to analyze their activities. The group has been linked to 110 public disclosures across our corpus. First observed on a leak site on February 25, 2025; most recent post September 2, 2026. The operation is currently active.

Timeline of this disclosure

  • September 2, 2026Marlborough Partners listed by anubison the group's public leak site

Other recent disclosures by anubis

anubis has been linked to 110 public victims on Darkfield. A sample of the most recent:

See the full anubis dossier →

Sector and geography

This disclosure adds to ransomware activity in the Financial Services sector, which has 1,195 disclosures indexed across all operators we track. Geographically, Marlborough Partners is reported in United Kingdom, a country with 377 ransomware disclosures in our corpus.

If your organisation is affected

A listing by anubis means Marlborough Partners 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, NCSC (United Kingdom), as required for your jurisdiction.
  • Monitor for the data appearing on anubis'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.