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Cyber Threat
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Ransomware victim Professional Services

Brunnberg & Forshed Arkitektkontor

Listed by Wallstreet on · organisation based in Sweden

Disclosed
Oct 13, 2026
Leak-site listing date
Threat group
Wallstreet
50 victims listed
Country
Sweden
#20 most targeted
Sector
Professional Services

ThreatAI analysis

Compiled from this incident record and the threat intelligence profile for Wallstreet. Figures and technique mappings are quoted from the source data, not inferred.

Brunnberg & Forshed Arkitektkontor was listed on the dark web leak site Wallstreet on 13 October 2026, an organisation based in Sweden that operates in the Professional Services sector.

About the Wallstreet group

Wallstreet has listed 28 victims since June 2026.

Incident analysis

Brunnberg & Forshed Arkitektkontor was listed by Wallstreet ransomware, a group with 50 victims recorded in this database. The listing appeared on the group's leak site on October 13, 2026.

Brunnberg & Forshed Arkitektkontor is based in Sweden and operates in the Professional Services sector. Sweden ranks #20 worldwide for ransomware disclosures, with 160 victims in this database.

Sector context. Organisations in this sector hold valuable data and operational systems that ransomware groups seek to exploit for financial gain through encryption and data exfiltration.

Wallstreet typically follows a double extortion model: data is exfiltrated from the victim's systems before files are encrypted, so the victim faces two demands at once — pay to restore access, and pay to keep stolen data unpublished. The leak site, where this listing appeared, is the lever for the second demand.

Source. Public leak-site disclosures aggregated via the ransomware.live API. The disclosure date is when the listing was published, which can differ from the date of compromise. This site does not publish or link to stolen data. Last updated .

Frequently asked questions

Was Brunnberg & Forshed Arkitektkontor attacked by ransomware?

Yes. Brunnberg & Forshed Arkitektkontor was listed as a victim of the Wallstreet ransomware group on October 13, 2026. The organisation is based in Sweden and operates in the Professional Services sector. The disclosure appeared on the group's dark web leak site.

Which ransomware group attacked Brunnberg & Forshed Arkitektkontor?

Brunnberg & Forshed Arkitektkontor was attacked by Wallstreet ransomware. Wallstreet is one of the most active ransomware groups, having claimed 50 victims globally. The group typically employs a double-extortion model: encrypting the victim's files and threatening to publish stolen data.

When did the Brunnberg & Forshed Arkitektkontor ransomware attack occur?

The ransomware attack on Brunnberg & Forshed Arkitektkontor was disclosed on October 13, 2026. This date reflects when the victim was published on the threat group's leak site, which may differ from the actual date of initial compromise.

What data was stolen in the Brunnberg & Forshed Arkitektkontor ransomware attack?

The specific data stolen from Brunnberg & Forshed Arkitektkontor has not been independently verified by this platform. Ransomware groups typically exfiltrate data before encrypting systems and use the threat of publication to pressure victims. As a Professional Services organisation, Brunnberg & Forshed Arkitektkontor likely held sensitive business data, client information, and operational records.

How can organisations protect against Wallstreet attacks?

To defend against Wallstreet and similar threat actors, organisations should: maintain regular offline backups tested for restoration; implement network segmentation to limit lateral movement; deploy multi-factor authentication on all remote access; use endpoint detection and response (EDR) tools; conduct regular phishing and security awareness training; and monitor threat intelligence feeds for indicators of compromise (IOCs) associated with active groups.