Was Planungsgruppe M+M AG hit by ransomware?

Planungsgruppe M+M AG was listed by the aurora 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 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 Planungsgruppe M+M AG breach?

aurora published data attributed to Planungsgruppe M+M AG. Darkfield captured the leak post and a screenshot of the listing.

Ransomware victim disclosure

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Planungsgruppe M+M AG

Claimed by Aurora · listed 10 hours ago

Today

Age

since listed · data leaked

Status timeline

ListedAug 17, 2026
Data leakeddate unknown

At a glance

Group: Aurora
Status: Data leaked
Country: Switzerland
Sector: Professional Services
Listed on leak site: Aug 17, 2026

About the victim

AI dossier — public-source company profile

Planungsgruppe M+M AG is a German professional services firm headquartered in Böblingen with approximately 432 employees across 10 offices in major German cities. The company specializes in architecture, urban planning, structural engineering, building physics, fire protection, BIM modelling, landscape planning, and interior design, having completed over 5,200 projects over decades of operation with annual revenue around €52 million.

Industry: Architecture & Urban Planning; Structural Engineering; Building Design Services
Address: Böblingen, Baden-Württemberg, Germany (headquarters); 10 offices across Germany
Employees: 432

Attack summary

Severity: critical — Confirmed exfiltration of regulated financial data (DATEV, SFirm, payroll), employee PII (HR, payroll), email archives, and 20 years of business records at scale (268 GB, 124,000 files). Financial and payroll data are subject to German data protection law; exposure represents significant regulatory and operational risk.

Aurora claims to have exfiltrated two complete file servers (MMBB04, MMBB05) plus financial, banking, document management, email, and payroll systems. The dataset comprises approximately 268 GB across 124,000 files spanning 20 years (2006–2026), including DATEV financial archives, SFirm banking databases, ELO document management, Outlook email (PSTs), and HR/payroll records.

critical

Data the group says was taken

AI dossier — extracted from the leak post

Financial processing archives (DATEV)
Banking software databases (SFirm)
Document management system (ELO)
Email archives (Outlook PSTs)
Payroll and HR data
Project files and technical documentation
File server backups (MMBB04, MMBB05)

What the group claims

Planungsgruppe M+M AG is a German Aktiengesellschaft headquartered in Böblingen, Baden-Württemberg, with approximately 432 employees across 10 offices (Böblingen, Stuttgart, München, Nürnberg, Regensburg, Ingolstadt, Augsburg, Esslingen, Mannheim, Frankfurt). Annual revenue: approximately €52 million. The firm provides architecture, urban planning, structural engineering, building physics, fire protection, BIM, landscape planning, and interior design services. Over 5,200 projects completed across decades of operation. The exfiltrated dataset spans two complete file servers (MMBB04, MMBB05), plus the DATEV financial processing archives, SFirm banking software databases, the ELO document management system, Outlook email archives (PSTs), and payroll/HR data — a total of 268 GB across approximately 124,000 files, covering 2006 to 2026.

The leak post

captured from the group's site

Planungsgruppe M+M AG is a German Aktiengesellschaft headquartered in Böblingen, Baden-Württemberg, with approximately 432 employees across 10 offices (Böblingen, Stuttgart, München, Nürnberg, Regensburg, Ingolstadt, Augsburg, Esslingen, Mannheim, Frankfurt). Annual revenue: approximately €52 million. The firm provides architecture, urban planning, structural engineering, building physics, fire protection, BIM, landscape planning, and interior design services. Over 5,200 projects completed across decades of operation. The exfiltrated dataset spans two complete file servers (MMBB04, MMBB05), plus the DATEV financial processing archives, SFirm banking software databases, the ELO document management system, Outlook email archives (PSTs), and payroll/HR data — a total of 268 GB across approximately 124,000 files, covering 2006 to 2026.

Sources

Source

Indexed 10 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 31 public disclosures across our corpus. First observed on a leak site on April 29, 2026; most recent post August 17, 2026. The operation is currently active.

Timeline of this disclosure

August 17, 2026Planungsgruppe M+M AG listed by auroraon the group's public leak site

Sector and geography

This disclosure adds to ransomware activity in the Professional Services sector, which has 14 disclosures indexed across all operators we track. Geographically, Planungsgruppe M+M AG is reported in Switzerland, a country with 39 ransomware disclosures in our corpus.

If your organisation is affected

A listing by aurora means Planungsgruppe M+M AG 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 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.