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Schellman began as a SOC audit firm 20+ years ago. While we still issue more than 2,000 SOC reports each year, our clients’ trust has propelled our expansion. Today, we offer nearly 60 types of audits and assessments delivered by full-time employees. No outsourcing. No compromises.

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Schellman is the only Top 50 CPA firm focused exclusively on IT Compliance and Cybersecurity, and we’re the #1 service provider for FedRAMP Assessments.Our industry-leading NPS scores, client retention, and employee retention (low-to-no team churn = less audit fatigue) mean our clients experience greater continuity and quality.We also understand how distracting unplanned work can be, so we focus on client-centric KPIs to help keep your business moving uninterrupted.

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Ryan Warren

Ryan Warren is a Senior Penetration Tester with Schellman in the Little Rock, AR area, where he performs several offensive security assessments including internal/external network testing, social engineering, and web application tests. Prior to joining Schellman in 2022, Ryan worked in city government as an Information Security Coordinator, which included vulnerability management and incident response.

Blog Feature

Penetration Testing

How to Attack Active Directory: Which Training is For You?

By: Ryan Warren
November 1st, 2024

While many companies are moving to the cloud, it's still common to find Active Directory (AD) deployed locally in Windows environments. During internal network pen tests, I was pretty comfortable with lateral movement and privilege escalation (via missing patches or LLMNR/NBT-NS/IPv6, open network shares, etc.) but felt lacking in how I could leverage attacks against AD to provide more impact during the assessment. In my journey to get better at attacking AD, I was able to enroll in different free and paid courses. This blog post will provide you with an overview of the four I found to be most beneficial personally.

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