Was Reviso Cloud Accounting Limited hit by ransomware?

Reviso Cloud Accounting Limited was listed by the direwolf ransomware operation (Denmark), 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 direwolf ransomware group?

direwolf 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 Reviso Cloud Accounting Limited breach?

direwolf published data attributed to Reviso Cloud Accounting Limited. Darkfield captured the leak post and a screenshot of the listing.

Ransomware victim disclosure

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Reviso Cloud Accounting Limited

Claimed by Direwolf · listed 6 hours ago

Today

Age

since listed · data leaked

Status timeline

ListedAug 21, 2026
Data leakeddate unknown

At a glance

Group: Direwolf
Status: Data leaked
Country: Denmark
Sector: Financial Services
Listed on leak site: Aug 21, 2026

About the victim

AI dossier — public-source company profile

Reviso is a cloud-based accounting and invoicing software platform designed for small and medium-sized businesses (SMEs). The platform provides tools for bookkeeping, invoicing, financial reporting, VAT management, bank reconciliation, inventory control, and project management. It serves self-employed professionals, small companies, and accounting practices across multiple regions.

Industry: Financial Technology & Accounting Software

Attack summary

Severity: medium — Disclosure status is 'data_published' with no data size specified and no proof files advertised. The breach affects a financial software provider serving SMEs, meaning customer data (invoices, accounting records, potentially PII of business owners and employees) could be exposed; however, without confirmation of exfiltration scope or nature, and given the absence of proof artifacts, severity is rated medium rather than high.

The direwolf group claims to have breached Reviso Cloud Accounting Limited. The leak post does not specify whether data was encrypted, exfiltrated, or both, nor does it detail what categories of data are at stake.

medium

Original description

AI-summarised, not from the leak post

Reviso Cloud Accounting Limited is a software company that provides cloud-based accounting solutions primarily targeting small and medium-sized businesses. The platform offers tools for bookkeeping, invoicing, financial reporting, and VAT management. The company operates within the financial technology and accounting software industry and is based in the United Kingdom, serving businesses seeking accessible and scalable online accounting services.

Sources

Victim sitereviso.com
Leak posthttp://direwolfcdkv5whaz2spehizdg22jsuf5aeje4asmetpbt6ri4jnd4qd.onion/api/public/articles/109

Source

Indexed 6 hours 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 direwolf

Direwolf is a ransomware group that emerged in May 2025 with primarily financial motivations, having targeted 71 known victims across multiple sectors and geographic regions. The group's origin and potential affiliations remain undocumented in public threat intelligence reports, with no confirmed information regarding whether they operate as a Ransomware-as-a-Service model or as an independent entity. Their attack methodology and technical capabilities have not been extensively documented by major cybersecurity firms or government agencies, though their targeting patterns indicate a focus on manufacturing, technology, healthcare, and transportation/logistics sectors across Malaysia, the United States, Thailand, Singapore, and Taiwan. No major high-profile campaigns or significant ransomware demands have been publicly attributed to this group by CISA, FBI, or established security researchers such as Mandiant. Given the group's recent emergence and limited public documentation, their current operational status and long-term threat posture remain unclear, requiring continued monitoring by the cybersecurity community to establish a more comprehensive threat profile. The group has been linked to 113 public disclosures across our corpus. First observed on a leak site on May 27, 2025; most recent post August 21, 2026. The operation is currently active.

Also tracked as: DIRE WOLF.

Timeline of this disclosure

August 21, 2026Reviso Cloud Accounting Limited listed by direwolfon the group's public leak site

Other recent disclosures by direwolf

direwolf has been linked to 113 public victims on Darkfield. A sample of the most recent:

See the full direwolf dossier →

Sector and geography

This disclosure adds to ransomware activity in the Financial Services sector, which has 1,194 disclosures indexed across all operators we track. Geographically, Reviso Cloud Accounting Limited is reported in Denmark, a country with 14 ransomware disclosures in our corpus.

If your organisation is affected

A listing by direwolf means Reviso Cloud Accounting Limited 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, CFCS (Denmark), as required for your jurisdiction.
Monitor for the data appearing on direwolf'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.