Alge-Stop Ransomware Attack by m3rx (May 2026)

Claim Summary

On May 6, 2026, the ransomware group m3rx allegedly added the Danish consumer services company Alge-Stop (alge-stop.dk) to its leak site. The group claims to have exfiltrated 73GB of data comprising 7,100 files. According to the leak site, the stolen data includes contact information (specifically a phone number: +45 22100211) and internal company documents. The group’s description of Alge-Stop’s business - which involves cleaning and protecting outdoor surfaces such as roofs, walls, and paving stones - suggests the data may relate to customer records, operational procedures, or proprietary treatment formulas. This claim has not been independently verified by Yazoul Security.

Threat Actor Profile

The group m3rx is a relatively obscure ransomware operation with limited public track record. Based on available intelligence, m3rx has not been widely documented in cybersecurity research, and their total known victim count remains unknown. Their tools, tactics, and procedures (TTPs) are not publicly cataloged, which makes credibility assessment difficult. The group’s leak site post is sparse, lacking the typical ransom note or negotiation timeline seen from more established groups like LockBit or BlackCat. This could indicate either a nascent operation or a low-sophistication actor. Without YARA rules or detection guidance available, defenders should treat this as a generic ransomware threat and apply standard mitigations: patch management, endpoint detection, and network segmentation.

Alleged Data Exposure

The group claims to have stolen 73GB of data, including a phone number (+45 22100211) and unspecified files. The volume suggests potential exposure of:

• Customer contact lists (names, addresses, phone numbers)
• Service records and treatment schedules
• Financial or billing data
• Proprietary cleaning formulas or treatment protocols
• Employee records or internal communications

The inclusion of a direct phone number in the leak description raises concerns about targeted harassment or social engineering of Alge-Stop’s clients. However, the group has not published any data samples or screenshots to substantiate the claim.

Potential Impact

If the claim is verified, Alge-Stop faces several risks:

• Reputational damage: Clients may lose trust in the company’s data security.
• Regulatory consequences: As a Danish company, Alge-Stop may be subject to GDPR obligations. A data breach involving customer PII could trigger fines and mandatory notification requirements.
• Operational disruption: The group may have encrypted systems, potentially halting service delivery and treatment schedules.
• Financial loss: Costs could include ransom negotiation, forensic investigation, system restoration, and legal fees.

Given the group’s unknown credibility, the impact may be limited if the claim is exaggerated. However, the 73GB volume is significant for a small-to-medium enterprise.

What to Watch For

• Data leaks: Monitor dark web forums for any subsequent publication of Alge-Stop data by m3rx or other actors.
• Phishing campaigns: The exposed phone number may be used in vishing or SMS phishing attacks targeting Alge-Stop clients.
• Ransom demands: If the group follows typical patterns, they may contact Alge-Stop directly with a ransom note.
• Third-party risk: Partners or vendors of Alge-Stop should verify their own systems for any signs of compromise.

Disclaimer

This report is based on unverified claims made by the ransomware group m3rx on their leak site. Yazoul Security has not independently confirmed the breach, the volume of data, or the authenticity of the stolen information. Ransomware groups frequently exaggerate or fabricate claims to pressure victims. All information should be treated as preliminary and subject to change upon further investigation. No PII, download links, or access credentials are provided in this report. Organizations should consult official advisories and conduct their own forensic analysis before taking action.