TUM Transportistas Unidos Mexicanos Data Breach

Krybit ransomware has listed TUM Transportistas Unidos Mexicanos División Norte S.A. de C.V. as a victim, with the listing appearing on September 1, 2026. This incident was flagged by SOCRadar’s Dark Web Monitoring. TUM Transportistas Unidos Mexicanos División Norte operates as a critical component of Mexico’s regional transit infrastructure, providing passenger and freight transport services across northern Mexico. The nature of its operations, which involve significant logistical coordination and movement of goods, potentially makes it an attractive target for ransomware groups seeking to disrupt operations and extort payment. In the 60 days preceding this listing, Krybit claimed 58 other victims. The group has shown a preference for targeting organizations within the Professional Services, Other, and Technology sectors, with a geographical concentration in India, Thailand, and Brazil. Recent listings by Krybit in Latin America and the transportation sector include Transportes Montejo S.A.S. and Country Motos S.A. de C.V. The inclusion of TUM Transportistas Unidos Mexicanos División Norte aligns with Krybit’s established targeting patterns in terms of industry and geographic region.

SOCRadar’s dark web monitoring service detected the krybit ransomware listing for tum[.]com.mx, which includes 26 records spanning July through August 2026. Of these records, 11 were classified as employee credentials. The key endpoints identified in the stealer logs associated with this domain include Microsoft 365 identity provider (Azure AD / Entra), ADFS (on-premises Active Directory Federation Services), Exchange Online Web Access (OWA) mail portal, and RDP/terminal gateway hosts. The presence of ADFS and RDP gateway credentials, especially without evidence of rotation within the observed July-August 2026 window, is a strong indicator of a kill chain consistent with ransomware operations. This combination of credentials is often used for initial access, lateral movement via identity infrastructure, and eventual deployment of ransomware through remote access protocols. The query results do not confirm that TUM Transportistas Unidos Mexicanos División Norte is unaffected, as the data may represent partial findings or credentials that were compromised and subsequently rotated before being indexed. The identified credentials for ADFS, RDP, and Microsoft 365 indicate potential vulnerabilities that could be exploited by threat actors to gain unauthorized access. The lack of recent rotation for these credentials suggests a prolonged period of exposure, which is a common precursor to ransomware attacks. To mitigate these risks, it is crucial to immediately rotate all RDP, ADFS, and M365 credentials. Additionally, organizations should pull and review Exchange and identity provider logs from July 2026 onward to identify any suspicious activities or unauthorized access.

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.