Was Sehlmann Fensterbau hit by ransomware?

Sehlmann Fensterbau was listed by the Akira ransomware operation (Germany), 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 Akira ransomware group?

Akira 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 Sehlmann Fensterbau breach?

Akira published data attributed to Sehlmann Fensterbau. Darkfield captured the leak post and a screenshot of the listing.

Ransomware victim disclosure

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Sehlmann Fensterbau

Claimed by Akira · listed 2 months ago

Age

since listed · data leaked

Status timeline

ListedApr 9, 2026
Data leakeddate unknown

At a glance

Group: Akira
Status: Data leaked
Country: Germany
Sector: Manufacturing
Listed on leak site: Apr 9, 2026

About the victim

AI dossier — public-source company profile

Sehlmann Fensterbau GmbH is a German company specialising in the manufacture of wooden and wood-metal windows, operating in the Hamburg metropolitan area. The company provides end-to-end services covering consultation, planning, production, and installation for both new constructions and renovations.

Industry: Wooden & Wood-Metal Window Manufacturing
Address: Hamburg metropolitan area, Germany

Attack summary

Severity: high — Confirmed exfiltration of 44 GB of data including regulated personal identity documents (passports, DLs, national IDs) constituting PII, alongside financial and business records. The data is described as pending publication, indicating imminent exposure of sensitive employee information.

Akira claims to have exfiltrated approximately 44 GB of corporate data from Sehlmann Fensterbau GmbH, including employee personal identity documents (passports, driving licences, EU IDs), financial records, and project files, with publication of the data stated as imminent.

high

Data the group says was taken

AI dossier — extracted from the leak post

Employee passports
Driving licences
EU identity cards
Financial records
Project files
Corporate data (general)

What the group claims

Sehlmann Fensterbau GmbH specializes in wooden and wood-metal win dows in the Hamburg metropolitan area. They offer optimal window solutions for innovative new constructions and stylish renovation s, providing services from consultation and planning to productio n and installation. We will upload 44gb of corporate data soon. Employee personal fil es (passports, DLs, EU IDs and other files), financials, lots of project files, etc.

Source

Indexed 2 months 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 Akira

Akira is a ransomware group that emerged in April 2023, operating with primarily financial motivations and has rapidly established itself as a significant threat actor with over 1,500 documented victims. The group's country of origin remains unclear, though they operate as a Ransomware-as-a-Service (RaaS) model, recruiting affiliates to conduct attacks while the core group maintains the ransomware infrastructure and negotiation processes. Akira employs multi-faceted attack methodologies including exploitation of VPN vulnerabilities, particularly targeting Cisco VPN appliances, and utilizes living-off-the-land techniques along with legitimate administrative tools to avoid detection, while implementing double extortion tactics by exfiltrating sensitive data before deploying their encryption payload. The group has demonstrated a preference for targeting organizations in the United States, Canada, Germany, United Kingdom, and Italy, with a particular focus on manufacturing, business services, technology, and construction sectors, though they have shown willingness to attack various industries. Despite being relatively new to the ransomware landscape, Akira has maintained consistent operations throughout 2023 and into 2024, with law enforcement agencies including CISA and FBI issuing advisories about their activities, though no major disruption operations have been publicly reported against the group as of late 2024. The group has been linked to 1,648 public disclosures across our corpus. First observed on a leak site on April 26, 2023; most recent post June 12, 2026. The operation is currently active.

Also tracked as: Megazord.

Timeline of this disclosure

April 9, 2026Sehlmann Fensterbau listed by Akiraon the group's public leak site

Other recent disclosures by Akira

Akira has been linked to 1,648 public victims on Darkfield. A sample of the most recent:

See the full Akira dossier →

Sector and geography

This disclosure adds to ransomware activity in the Manufacturing sector, which has 2,458 disclosures indexed across all operators we track. Geographically, Sehlmann Fensterbau is reported in Germany, a country with 334 ransomware disclosures in our corpus.

If your organisation is affected

A listing by Akira means Sehlmann Fensterbau 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.
Monitor for the data appearing on Akira'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.