# ARM breached, D1R ransomware gang claims victim

Published: 2026-07-13 · Severity: routine · Sectors: technology
Canonical: https://vorant.io/reports/5767c1f9-c32e-55c4-8267-256e914fb66a/arm-breached-d1r-ransomware-gang-claims-victim

> D1R ransomware gang claims compromise of ARM with 3,633 users and 62 third-party credentials exposed.

ARM has been identified as a victim by the D1R ransomware gang on ransomware.live, a tracking platform that indexes ransomware operators' public claims. The breach reportedly involved 14 compromised employee accounts, 3,633 compromised user accounts, and 62 third-party employee credentials. The attack exposed 125 external attack surface endpoints and multiple DNS records associated with ARM's domain. The article provides no technical details on initial access, exploitation methods, or lateral movement techniques. This represents a significant compromise of a major technology company with downstream supply-chain risk due to ARM's role as a semiconductor intellectual-property provider. The claim has been made public by the threat actor, indicating potential data exfiltration and likely demands for ransom or threat of data sale.

## Mentioned in this report

- Threat actors: D1R
- Malware: D1R

1 detection for this report is in the app: the rules that match its indicators, the Sigma rules already converted to Splunk SPL, to Elastic where their fields map onto Elastic's integrations and to Microsoft Defender XDR KQL wherever Defender records the activity, and the YARA and Suricata. A new account gets three days of them free.

Source reporting: https://www.ransomware.live/id/QVJNQEQxUg==

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