Was Spectrum Arkitekter AB hit by ransomware?

Spectrum Arkitekter AB 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 Spectrum Arkitekter AB breach?

WALLSTREET published data attributed to Spectrum Arkitekter AB. Darkfield captured the leak post and a screenshot of the listing.

Ransomware victim disclosure

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Spectrum Arkitekter AB

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

Spectrum Arkitekter AB is a Stockholm-based architecture and interior design firm specializing in commercial properties, workplaces, hotels, property development, and product design.

Industry: Architecture & Interior Design

Attack summary

Severity: low — Data has been published, but no proof files, screenshots, or specific data inventory is detailed in the leak post. No operational impact stated. Insufficient evidence of sensitive data exposure.

Wallstreet claims to have exfiltrated data from Spectrum Arkitekter AB. No details on the nature of exfiltrated data or confirmation of encryption are provided in the post.

low

What the group claims

Stockholm architecture and interior-design firm, with work including commercial properties, workplaces, hotels, property development, and product design.

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, 2026Spectrum Arkitekter AB 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, Spectrum Arkitekter AB is reported in Sweden, a country with 18 ransomware disclosures in our corpus.

If your organisation is affected

A listing by WALLSTREET means Spectrum Arkitekter AB 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.