Was Byrån för Arkitektur och Urbanism hit by ransomware?

Byrån för Arkitektur och Urbanism was listed by the WALLSTREET ransomware operation (Sweden), 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 WALLSTREET ransomware group?

WALLSTREET 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 Byrån för Arkitektur och Urbanism breach?

WALLSTREET published data attributed to Byrån för Arkitektur och Urbanism. Darkfield captured the leak post and a screenshot of the listing.

Ransomware victim disclosure

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Byrån för Arkitektur och Urbanism

Claimed by Wallstreet · listed 5 hours ago

Today

Age

since listed · data leaked

Status timeline

ListedOct 13, 2026
Data leakeddate unknown

At a glance

Group: Wallstreet
Status: Data leaked
Country: Sweden
Sector: Professional Services
Listed on leak site: Oct 13, 2026

About the victim

AI dossier — public-source company profile

Byrån för Arkitektur och Urbanism is a Stockholm-based architecture firm specializing in architecture and urban development projects, including housing, offices, retail, and renovation work.

Industry: Architecture & Urban Development

Attack summary

Severity: low — Disclosure is announcement-only with no proof files, no explicit data inventory, and no operational impact stated. Insufficient evidence to assess exfiltration or encryption.

Wallstreet group claims to have attacked the firm. The leak post provides no details on the attack method (encryption, exfiltration, or both) or the specific data categories at stake.

low

What the group claims

Stockholm architecture firm working in architecture and urban development, including housing, offices, retail, and renovation projects

Source

Indexed 5 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 WALLSTREET

WALLSTREET has claimed 5 victims and remains active as of July 2026, operating a single onion mirror. The group's limited victim count makes sector or geographic patterns unclear at this stage. The group has been linked to 39 public disclosures across our corpus. The operation is currently active.

Timeline of this disclosure

October 13, 2026Byrån för Arkitektur och Urbanism listed by WALLSTREET on the group's public leak site

Other recent disclosures by WALLSTREET

WALLSTREET has been linked to 39 public victims on Darkfield. A sample of the most recent:

See the full WALLSTREET dossier →

Sector and geography

This disclosure adds to ransomware activity in the Professional Services sector, which has 17 disclosures indexed across all operators we track. Geographically, Byrån för Arkitektur och Urbanism is reported in Sweden, a country with 18 ransomware disclosures in our corpus.

If your organisation is affected

A listing by WALLSTREET means Byrån för Arkitektur och Urbanism 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, CERT-SE (Sweden), as required for your jurisdiction.
Monitor for the data appearing on WALLSTREET'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.