Was Sumitomo Electric Bordnetze hit by ransomware?

Sumitomo Electric Bordnetze was listed by the aurora 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 aurora ransomware group?

aurora 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 Sumitomo Electric Bordnetze breach?

aurora published data attributed to Sumitomo Electric Bordnetze. Darkfield captured the leak post and a screenshot of the listing.

Ransomware victim disclosure

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Sumitomo Electric Bordnetze (SEBN)

listed as Sumitomo Electric Bordnetze · Claimed by Aurora · listed 21 hours ago

Today

Age

since listed · data leaked

Status timeline

ListedJun 16, 2026
Data leakeddate unknown

At a glance

Group: Aurora
Status: Data leaked
Country: Germany
Sector: Manufacturing
Listed on leak site: Jun 16, 2026

About the victim

AI dossier — public-source company profile

Sumitomo Electric Bordnetze (SEBN) is a Wolfsburg-based subsidiary of Sumitomo Electric Industries, a major Japanese conglomerate with ~$31B in group revenue. SEBN operates manufacturing facilities across 14 countries and specializes in automotive electrical components and wiring systems, notably for Audi platforms.

Industry: Automotive Electrical Systems & Wiring Harnesses
Address: Wolfsburg, Germany
Employees: 40000

Attack summary

Severity: critical — Confirmed exfiltration of 1.1 TB including PII at scale (40,000 employee organization), regulated financial data (banking infrastructure, authentication credentials, IBAN registries), and sensitive business/engineering data. The compromise of Citibank corporate banking systems and authentication materials poses systemic financial and operational risk.

Aurora claims exfiltration of 1.1 terabytes of data from five SEBN manufacturing sites (Moldova, Ukraine, Tunisia, Slovakia) spanning HR records, payroll data, engineering documentation, and critically, Citibank corporate banking infrastructure including authentication credentials and payment systems. No encryption or operational disruption is mentioned.

critical

Data the group says was taken

AI dossier — extracted from the leak post

HR and payroll records
Personal tax records and documentation
Passport copies
Litigation files
Email archives (PST format)
Audi B9 project data and engineering drawings (2,500 CAD files)
Quality and FMEA/PPAP manufacturing documentation
Finance records
Citibank corporate banking credentials (TESTKEY authentication system)
IBAN registries
Bank statements
SAP salary-payment files
Department email archives

The group's post references roughly 173,000 Excel files, 149,000 PDFs, 2,500 CAD drawings, 2,500 Outlook messages, 1,500 FMEA files, 9 PST archives proof files.

What the group claims

[electric] *** SE (SEBN) — a Wolfsburg-headquartered subsidiary of Sumitomo Electric Industries (TSE:5802, ~$31B group revenue), employing approximately 40,000 people across 14 countries. Exfiltrated 1.1 terabytes of data from five manufacturing sites. SEBN Moldova (103 GB) — HR, payroll, personal tax records, competition-council litigation files, home directories SEBN Ukraine (115 GB) — HR/salary, Audi B9 project data, process documentation, including displaced-worker records for Ukrainian IDPs SEBN Tunisia — Fejja (191 GB + 493 GB shared) — passport copies, email archives (671 MB PST), quality/FMEA data, finance SEBN Slovakia (268 GB) — the crown jewel: Citibank corporate banking infrastructure including the TESTKEY authentication system, IBAN registries, daily bank statements, SAP salary-payment files, and years of department email archives The dataset contains 173,000 Excel files, 149,000 PDFs, 2,500 CAD engineering drawings, 2,500 Outlook messages, 1,500 FMEA/PPAP quality files, and 9 Outlook PST archives.

Sources

Source

Indexed 21 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 aurora

Aurora is a recently emerged ransomware group first observed in April 2026, operating with apparent financial motivations through targeted attacks across multiple sectors. Given its recent emergence, limited public documentation exists regarding the group's specific country of origin or affiliations with established ransomware operations, though its targeting patterns suggest a professional operation potentially operating as an independent entity rather than a known Ransomware-as-a-Service model. The group has demonstrated a preference for attacking business-critical sectors including business services, consumer services, manufacturing, healthcare, and financial services, with documented attacks spanning the United States, Canada, the Maldives, and Great Britain, though specific initial access vectors and technical methodologies remain undocumented by major threat intelligence firms. With only seven known victims documented since April 2026, Aurora represents a relatively small-scale operation compared to established ransomware families, though its cross-sector targeting approach and international victim scope indicate deliberate selection criteria rather than opportunistic attacks. The group remains active as of current reporting, though the limited victim count and recent emergence suggest either a highly selective targeting approach or a nascent operation still developing its operational capabilities. The group has been linked to 13 public disclosures across our corpus. First observed on a leak site on April 29, 2026; most recent post June 16, 2026. The operation is currently active.

Timeline of this disclosure

June 16, 2026Sumitomo Electric Bordnetze listed by auroraon the group's public leak site

Other recent disclosures by aurora

aurora has been linked to 13 public victims on Darkfield. A sample of the most recent:

See the full aurora dossier →

Sector and geography

This disclosure adds to ransomware activity in the Manufacturing sector, which has 3,674 disclosures indexed across all operators we track. Geographically, Sumitomo Electric Bordnetze is reported in Germany, a country with 378 ransomware disclosures in our corpus.

If your organisation is affected

A listing by aurora means Sumitomo Electric Bordnetze 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-Bund (Germany), as required for your jurisdiction.
Monitor for the data appearing on aurora'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.