Ricardo J. Ruiz Fernández

Pentester | OffSec instructor | OSCE3 OSCP GX-PT

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CrystalPotato - GodPotato in Crystal

August 22, 2026 Red Team Malware Development

CrystalPotato is a Crystal port of GodPotato, a local privilege escalation tool that abuses the DCOM OXID Resolver and named pipe impersonation to escalate from service accounts with SeImpersonatePrivilege to NT AUTHORITY\SYSTEM.

Repository: https://github.com/ricardojoserf/CrystalPotato

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Offensive Tools Using the Deno Runtime

August 17, 2026 Red Team Malware Development

Deno is a modern JavaScript runtime that is gaining traction among threat actors as a Bring Your Own Scripting Interpreter (BYOSI) tool. This post covers how Deno is being weaponized in the wild, why it is attractive for offensive operations, and introduces five Red Team tools I have ported to Deno.

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BACnet-scan - Tool for BACnet/IP and BACnet/SC discovery

May 4, 2026 Tools ICS/OT

A command-line tool for discovering and fingerprinting BACnet devices on a network supporting BACnet/IP (UDP Who-Is probes) and BACnet/SC (TCP + TLS detection), with concurrent subnet scanning and a combined summary report.

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Automating the Pass-The-Ticket attack

February 10, 2026 Active Directory Red Team

AutoPtT enumerates Kerberos tickets and performs Pass-the-Ticket (PtT) attacks interactively or step by step. It is a standalone alternative to Rubeus or Mimikatz for this attack, implemented in C#, C++, Crystal, Python and Rust.

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Local Admin Account Creation and the SAMR API

January 27, 2026 Privilege Escalation

This post compiles multiple techniques to create local administrator accounts on Windows systems, from basic commands to the lowest-level SAMR API calls. It serves as a resource for Purple Teams to test detection capabilities against this common persistence method.

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Creating Shadow Copies with VSS API

January 12, 2026 Credential Access

On Windows 11, the built-in vssadmin can list, delete or resize Shadow Copies, but Microsoft removed the ability to create them. However, you can still do it by interacting directly with the Volume Shadow Copy Service (VSS) API.

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SAMDump - Stealthy SAM Dumping Using VSS and NTAPIs

November 14, 2025 Credential Access

SAMDump extracts Windows SAM and SYSTEM files using Volume Shadow Copy Service (VSS) with multiple exfiltration options and XOR obfuscation.

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Getting RCE in an AWS service (Amazon MWAA)

July 28, 2025 Cloud Web Exploitation

Amazon Managed Workflows for Apache Airflow (MWAA) is a managed service to run Apache Airflow on AWS without managing infrastructure. However, most installations are affected by CVE-2024-39877, an SSTI vulnerability which allows remote code execution.

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© 2026 Ricardo J. Ruiz Fernández