TrustedSec Security Blog

2023 Resolutions for Script Kiddies

January 17, 2023

Introduction 2022 was a tough year. It seemed like no one was safe. Nvidia, Samsung, Ubisoft, T-Mobile, Microsoft, Okta, Uber—and those were just some of Lapsus$’s breaches. What’s a Script Kiddie to do to be better protected in 2023? Another year in the books, and it was another big year for cybersecurity. While 2022 did…

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Auditing Exchange Online From an Incident Responder’s View

November 8, 2022

Business Email Compromise (BEC) within the Microsoft 365 environment is becoming a more common attack vector. In case you’re unfamiliar with what exactly BEC entails, it’s when an attacker or unauthorized user gains access to a business email account via social engineering. Most commonly, an attacker compromises an account, intercepts email conversation(s), and uses this…

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The Curious Case of the Password Database

October 20, 2022

Nowadays, password managers are king. We use password managers to secure our most sensitive credentials to a myriad of services and sites; a compromise of the password manager could prove devastating. Due to recently disclosed critical Common Vulnerabilities and Exposures (CVEs) involving ManageEngine’s Password Manager Pro software, a client came to us at TrustedSec, wondering:…

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Manipulating User Passwords Without Mimikatz

March 3, 2022

There are two common reasons you may want to change a user’s password during a penetration test: You have their NT hash but not their plaintext password. Changing their password to a known plaintext value can allow you to access services in which Pass-the-Hash is not an option. You don’t have their NT hash or…

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Local Admin Access and Group Policy Don’t Mix

January 24, 2019

Having spent a career working with Group Policies, I thought now might be a good time to give an overview of it and I felt like doing a little writeup about Group Policies. I especially want to highlight why having admin access to clients can be really bad. It is important that everyone understands the weaknesses…

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Credential Re-Use in the Enterprise graphic

Credential Re-Use in the Enterprise

July 3, 2018

Many of our customers follow the best practice of creating separate accounts for day-to-day tasks and administrative ones. In the event of an attack, using separate accounts is often a great way to slow things down and give security teams a little extra time for discovery and identification of an attack. Because many attacks happen…

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It Was the “Summerof2018” – Password Auditing for Windows Administrators

April 19, 2018

IT departments around the globe spend countless hours and money ensuring that their company’s data and infrastructure are properly secured. Startup company? Install a firewall and maybe get an antivirus subscription. Past the startup phase? Upgrade your firewall to have an Intrusion Prevention Sensor (IPS) and/or maybe an Intrusion Detection Sensor (IDS). Hitting the revenue…

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Introduction to GPU Password Cracking: Owning the LinkedIn Password Dump

June 17, 2016

This blog was written by Martin Bos, Senior Principal Security Consultant – TrustedSec Unless you’ve been living under a rock for the past few months you have probably heard about the dump from the 2012 LinkedIn hack being released.  TrustedSec was able to acquire a copy of the list and use it for research purposes. Our…

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Of History & Hashes: A Brief History of Password Storage, Transmission, & Cracking

May 29, 2015

A while back Jeremy Druin asked me to be a part of a password cracking class along with Martin Bos. I was to cover the very basics, things like “What is a password hash?”, “What types are there?”, and “What is the history of passwords, hashes and cracking them?”. This got me thinking about a…

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Account Hunting for Invoke-TokenManipulation

January 30, 2015

I’ve been searching quite a while now for the best way to search for domain admin tokens, once admin rights are attained on a large number of systems during a pentest. Normally, I run “psexec_loggedin_users” within Metasploit, spool the output to a file, then egrep it for users in the “Domain Admins” group. This often…

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