ESXiArgs is a ransomware campaign that emerged in February 2023, targeting VMware ESXi servers by exploiting the CVE-2021-21974 vulnerability. It encrypts virtual machine configuration files (.vmdk, .vmx, .vmxf, .vmsd, .vmsn, .vswp, .vmss, .nvram, .vmem) rendering VMs inaccessible. The campaign compromised thousands of unpatched servers globally, primarily affecting European organizations. A decryptor was later released by CISA and FBI. 1 ransom note(s) on file
Objectives
Executive Summary
ESXiArgs is a ransomware campaign targeting VMware ESXi servers via CVE-2021-21974. It encrypts virtual machine files, rendering them inaccessible and demanding payment for decryption. Thousands of European organizations were affected, with CISA and FBI releasing a decryptor.
Goals & Targeting
ESXiArgs aims for financial gain through ransom payments, targeting critical infrastructure sectors with VMware ESXi servers. Its regional focus on Europe suggests easier access or higher success rates there.
Enhanced Description
ESXiArgs emerged in February 2023, exploiting the CVE-2021-21974 vulnerability in VMware ESXi servers. It targets unpatched systems globally but primarily affected European organizations. The ransomware encrypts multiple VM configuration files, disrupting operations. CISA and FBI collaboration resulted in a decryptor to mitigate the threat.
Key Capabilities
MITRE ATT&CK Tactics
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Campaigns & Victims
Campaign targeted unpatched VMware servers globally, primarily in Europe. Notable operation in February 2023 with significant impact.
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Confidence Assessment
High confidence in vulnerability exploit and ransomware activity, but limited details on TTPs beyond described attack vector.
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