Lindner Group Data Breach

The m3rx ransomware group claimed to have targeted Lindner Group, an Austria-based manufacturing company, listing them on their leak site on August 30, 2026. The group alleges unauthorized access to the company’s systems and data. Lindner Group’s operations are conducted via the domain lindner-group[.]com. This claim has not been independently verified. The manufacturing sector is frequently targeted by ransomware groups, and Lindner Group’s industry and geographic location align with m3rx’s typical victimology. Over the past 60 days, m3rx has claimed responsibility for nine other victims. The group primarily targets organizations in the United States, Austria, and Brazil, with a notable focus on the Manufacturing and Professional Services sectors. Lindner Group’s profile as a manufacturing company based in Austria fits within this established targeting pattern of the m3rx ransomware group.

SOCRadar CTI’s analysis of stealer-log data returned a “severe_exposure_in_sample” verdict for Lindner Group. The telemetry identified 9 employee credentials associated with SSO, ADFS, Jira, and file-share endpoints. Additionally, 13 external records and 6 credentials with indicators of Telegram-based exfiltration were flagged. The timestamps of these credentials range from December 4, 2024, to August 27, 2026, suggesting a prolonged period of potential unauthorized access extending over more than 20 months prior to the leak-site listing. The presence of these compromised credentials, particularly those showing indicators of exfiltration via Telegram and spanning a significant time frame, suggests a potential pathway for ransomware operations. Infostealer malware often harvests credentials that can be used for initial access, lateral movement, or privilege escalation within targeted networks. The extended period of credential exposure raises concerns about the depth of compromise and the potential for attackers to maintain persistence within Lindner Group’s infrastructure. Given the observed credential exposure, it is recommended that Lindner Group conduct continued dark web and stealer-log monitoring. Proactive credential hygiene checks, including immediate password rotation and a thorough review of multi-factor authentication configurations across all systems, are crucial. Furthermore, monitoring of alternate corporate domains and detailed review of access logs for Microsoft 365, VPNs, and remote-access portals should be prioritized to detect any further malicious activity.

This report is intended for threat intelligence and security awareness purposes. SOCRadar does not host, redistribute or buy stolen data. All breach information reported here is collected from publicly accessible threat actor and ransomware portals. This content is intended to equip CTI teams with context around recent attacks. While we strive for accuracy, listings on ransomware leak and extortion sites cannot always be independently verified and may not reflect confirmed breaches. If you believe any data in this report is incorrect, please contact us.