Was swisspro.ch hit by ransomware?

swisspro.ch was listed by the blackbasta ransomware operation (Switzerland), 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 blackbasta ransomware group?

blackbasta 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 swisspro.ch breach?

blackbasta published data attributed to swisspro.ch. Darkfield captured the leak post and a screenshot of the listing.

Ransomware victim disclosure

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swisspro AG

listed as swisspro.ch · Claimed by Blackbasta · listed 2 years ago

27m

Age

since listed · data leaked

Status timeline

ListedMay 4, 2024
Data leakeddate unknown

At a glance

Group: Blackbasta
Status: Data leaked
Country: Switzerland
Sector: Technology
Listed on leak site: May 4, 2024

About the victim

AI dossier — public-source company profile

swisspro AG is an established Swiss service provider offering integrated solutions in electrical installation, ICT, and building automation. With over 1,000 employees across 20 locations nationwide, they serve SMEs, large enterprises, public institutions, and private clients with comprehensive planning, implementation, maintenance and support services.

Industry: Electrical Installation, ICT & Building Automation Services
Address: In der Luberzen 1, 8902 Urdorf, Switzerland
Employees: 1000

Attack summary

Severity: high — Confirmed exfiltration of 700 GB spanning corporate, employee personal data, and customer information. Large Swiss infrastructure/services company with significant employee and client base creates substantial exposure risk.

Black Basta claims to have exfiltrated approximately 700 GB of data from swisspro AG, including corporate data, employee personal information and customer data. The group has published this breach on their leak site with no stated ransom demand.

high

Data the group says was taken

AI dossier — extracted from the leak post

Corporate data
Employee personal information
Customer data

What the group claims

swisspro ist Ihr perfekter Partner für massgeschneiderte Gesamtlösungen rund um Beratung, Realisierung, Wartung und Betrieb von Elektroinstallation, ICT und Automation – ob für KMU oder Grossunternehmen. Mit unserer langjährigen Erfahrung, unserem grossen Know-how und den modernsten Technologien unterstützen wir Sie ganzheitlich, kompetent und zuverlässig, damit Sie sich ganz um Ihr Kerngeschäft kümmern können. Mit unseren rund 1’000 Spezialistinnen und Spezialisten an 20 Standorten in der ganzen Schweiz sind wir immer in Ihrer Nähe.SITE: www.swisspro.ch Address : swisspro AG In der Luberzen 1 8902 UrdorfTel# +41 44 444 11 22ALL DATA SIZE: ~700gb 1. Corporate data 2. Employees personal data, infos 3. Customer data & etc…

Sources

Victim siteswisspro.ch
Leak posthttp://stniiomyjliimcgkvdszvgen3eaaoz55hreqqx6o77yvmpwt7gklffqd.onion/?id=swisspro.ch

Source

Indexed 2 years 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 blackbasta

Black Basta is a highly sophisticated ransomware group that emerged in April 2022 and operates with a primary motivation of financial extortion, having rapidly established itself as one of the most prolific ransomware operations of the modern era with over 500 confirmed victims globally. The group is widely assessed by researchers including Mandiant and CISA to have likely ties to former members of the Conti ransomware syndicate following that group's dissolution in mid-2022, and operates as a private Ransomware-as-a-Service (RaaS) model with a closed affiliate structure rather than open recruitment, with suspected links to the FIN7 threat actor cluster based on observed tooling overlaps documented by SentinelOne and Microsoft. Black Basta employs a double extortion methodology, exfiltrating sensitive victim data prior to encryption and threatening publication on their Tor-based leak site "Basta News" to compound pressure on victims; initial access is predominantly achieved through phishing campaigns, purchase of stolen credentials, and exploitation of known vulnerabilities including QakBot malware distribution, with the group subsequently deploying tools such as Cobalt Strike, SystemBC, and their custom encryptor targeting both Windows and VMware ESXi environments using a ChaCha20 encryption algorithm. Per CISA and FBI joint advisory AA24-131A published in May 2024, the group has struck over 500 organizations across North America, Europe, and Australia, with high-profile victims including Ascension Health, Capita, the American Dental Association, and Rheinmetall, demonstrating a clear preference for manufacturing, business services, technology, transportation, and food production sectors across the United States, United Kingdom, Germany, Canada, and Italy. As of the time of available public reporting, Black Basta remained operationally active, though internal chat logs leaked in early 2025 revealed significant internal tensions and potential organizational fragmentation that security researchers assessed could impact the group's near-term operational cohesion. The group has been linked to 523 public disclosures across our corpus. First observed on a leak site on April 26, 2022; most recent post January 11, 2025. The operation is currently inactive.

Timeline of this disclosure

May 4, 2024swisspro.ch listed by blackbastaon the group's public leak site

Other recent disclosures by blackbasta

blackbasta has been linked to 523 public victims on Darkfield. A sample of the most recent:

See the full blackbasta dossier →

Sector and geography

This disclosure adds to ransomware activity in the Technology sector, which has 3,563 disclosures indexed across all operators we track. Geographically, swisspro.ch is reported in Switzerland, a country with 38 ransomware disclosures in our corpus.

If your organisation is affected

A listing by blackbasta means swisspro.ch 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, NCSC-CH (Switzerland), as required for your jurisdiction.
Monitor for the data appearing on blackbasta'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.