Everest Ransomware breaches Iron Mountain only to exfiltrate data

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Everest Ransomware breaches Iron Mountain only to exfiltrate data

Cybersecurity-Insiders • February 4, 2026

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In recent months, cybersecurity experts have observed a notable shift in the tactics used by ransomware and hacking groups.

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This article is one source in a clustered incident — the cluster page carries the summary, timeline and every other outlet covering it.

Everest Ransomware Group Breaches Iron Mountain, Exfiltrates Data Iron Mountain confirmed a data security incident after the Everest ransomware group claimed responsibility for breaching its systems. The attack involved the exfiltration of sensitive data, marking a significant shift in ransomware tactics observed by cybersecurity experts in recent months. 2 sources 33

Extracted Entities

Attack Types (2)

Data Breach Ransomware

Companies (1)

MITRE ATT&CK (1)

T1041 - Exfiltration Over C2 Channel

Ransomware Groups (1)

Everest Ransomware