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vCenter pre-auth RCE → root on every ESXi → mass encrypt

Pre-auth RCE on vCenter Server (DCERPC or vSphere Client class CVE). Deploy SSH key via vCenter to every managed ESXi, then mass-encrypt every .vmdk — the ESXiArgs / Black Basta playbook.

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§ Kill-chainDrag · zoom · scroll

§ Context

Assumed environment: target vCenter is reachable from the attacker's foothold and unpatched for a 2023+ pre-auth RCE. vCenter manages dozens / hundreds of ESXi hosts.

§ Steps

  1. 01
    Drop ransom note in vSphere UIImpact
    T1486— Data Encrypted for Impact
  2. 02
    Push attacker SSH key to every ESXiPersistence
    T1098— Account Manipulation
  3. 03
    Identify vCenter (port 443 / 9443)Discovery
    N-NMAP-INTERNAL— Internal Nmap Sweep
  4. 04
    Pre-auth RCE on vCenterInitial Access
    HV-VCENTER-RCE— vCenter Server RCE
  5. 05
    Mass-encrypt VMDKs across the estateImpact
    HV-ESXI-RANSOM— ESXi Mass-Encrypt Ransomware
  6. 06
    Extract cached ESXi credentials / SSO tokensCredential Access
    HV-NESTED-CRED— Hypervisor Credential Caches

§ References

§ Frequently asked

What is the "vCenter pre-auth RCE → root on every ESXi → mass encrypt" attack path?
Pre-auth RCE on vCenter Server (DCERPC or vSphere Client class CVE). Deploy SSH key via vCenter to every managed ESXi, then mass-encrypt every .vmdk — the ESXiArgs / Black Basta playbook. It chains 6 steps drawn from real-world offensive-security techniques.
What starting position does this attack require?
The first step is Drop ransom note in vSphere UI (T1486) — a impact primitive. Assumed environment: target vCenter is reachable from the attacker's foothold and unpatched for a 2023+ pre-auth RCE.
What is the final impact of this kill-chain?
The final step lands on Extract cached ESXi credentials / SSO tokens (HV-NESTED-CRED), which falls under Credential Access. From here, an operator typically pivots into post-exploitation or maintains persistence.
How can defenders detect or prevent this attack?
Detection and prevention vary per step. Refer to each linked MITRE ATT&CK entry under "References" — every technique on that page lists defensive controls, detection telemetry, and known threat-actor usage.

§ Related dossiers