Was teeuwissen.com hit by ransomware?

teeuwissen.com was listed by the devman ransomware operation (Netherlands), 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 devman ransomware group?

devman 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 teeuwissen.com breach?

devman published data attributed to teeuwissen.com (~80 GB). Darkfield captured the leak post and a screenshot of the listing.

Ransomware victim disclosure

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Teeuwissen Rioolreiniging

listed as teeuwissen.com · Claimed by Devman · listed 9 months ago

80 GB

Data size

Age

since listed · data leaked

Status timeline

ListedOct 3, 2025
Data leakeddate unknown

At a glance

Group: Devman
Status: Data leaked
Country: Netherlands
Sector: Agriculture and Food Production
Listed on leak site: Oct 3, 2025
Data size: 80 GB

About the victim

AI dossier — public-source company profile

Teeuwissen Rioolreiniging is a Dutch sewer cleaning and maintenance company headquartered in Huizen, Netherlands, with a second branch in Barneveld. The company offers services including drain unblocking, sewer installation and maintenance, pump pit management, and waste stream processing, serving private individuals, businesses, and government institutions. It operates 24/7 and processes recovered waste materials through its own wastewater treatment facilities.

Industry: Sewer Cleaning & Wastewater Services
Address: Bestevaer 50, 1271 ZA Huizen, Nederland

Attack summary

Severity: high — 80 GB of data has been published (disclosed status: data_published), indicating confirmed exfiltration at significant scale. The company serves government institutions and businesses, meaning the data could include contracts, operational records, and client PII. The volume and publication of data elevates this beyond medium severity.

The group 'devman' claims to have exfiltrated approximately 80 GB of data from Teeuwissen Rioolreiniging and has published the data, having initially demanded a ransom of €370,000. No details on encryption of systems were stated in the post.

high

Data the group says was taken

AI dossier — extracted from the leak post

80 GB of company data

What the group claims

Ransom: 370k 80gb

Sources

Victim siteteeuwissen.com
Leak posthttp://devmanblggk7ddrtqj3tsocnayow3bwnozab2s4yhv4shpv6ueitjzid.onion#teeuwissencom

Source

Indexed 9 months 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 devman

The devman ransomware group is a recently emerged threat actor that began operations in April 2025, demonstrating a financially motivated criminal enterprise with a focus on opportunistic targeting across multiple sectors and geographic regions. Given the group's recent emergence and limited public documentation, specific details regarding their country of origin, organizational structure, or potential affiliations with established ransomware-as-a-service operations remain unknown to major cybersecurity agencies and researchers. The group's attack methodology and technical capabilities have not been thoroughly documented by reputable security firms, though their targeting patterns suggest a broad opportunistic approach rather than highly specialized tactics. In the brief period since their emergence, devman has reportedly compromised 184 victims across diverse sectors including technology, healthcare, public sector organizations, and agriculture and food production, with primary targeting concentrated in the United States, France, Svalbard and Jan Mayen, Taiwan, and Thailand, though the inclusion of Svalbard and Jan Mayen in their targeting list may indicate data collection anomalies rather than actual operational focus on this remote Arctic territory. As of current reporting, devman appears to remain an active threat, though the lack of detailed technical analysis or law enforcement advisories suggests they may be operating at a relatively low profile compared to more established ransomware groups. The group has been linked to 184 public disclosures across our corpus. First observed on a leak site on April 6, 2025; most recent post February 4, 2026. The operation is currently active.

Timeline of this disclosure

October 3, 2025teeuwissen.com listed by devmanon the group's public leak site

Data size: 80 GB

Other recent disclosures by devman

devman has been linked to 184 public victims on Darkfield. A sample of the most recent:

See the full devman dossier →

Sector and geography

This disclosure adds to ransomware activity in the Agriculture and Food Production sector, which has 772 disclosures indexed across all operators we track. Geographically, teeuwissen.com is reported in Netherlands, a country with 150 ransomware disclosures in our corpus.

If your organisation is affected

A listing by devman means teeuwissen.com 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-NL (Netherlands), as required for your jurisdiction.
Monitor for the data appearing on devman'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.