Guillaume Ross

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Guillaume is a Principal Security Researcher at Uptycs. With experience as a security architect, consultant and with managing security operations, he loves to find ways to help organizations prevent attacks and reduce the noise that security and IT teams are subjected to. He believes that while it is impossible to prevent every single attack, a combination of good prevention techniques and security hygiene is the best way to then be able to focus on detecting and responding to only the important stuff.
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Recent Posts

Detecting Malicious Packages in Repositories like PyPI: Using Osquery for Complete Software Inventory

Posted by Guillaume Ross on 7/24/19 12:03 PM

Many systems make installing 3rd party software incredibly convenient; from packaging systems and well loved Linux distribution tools like Debian Apt to app stores and per-language repositories. Users are also often allowed to install browser extensions or plugins, which come from their own “store” and are just another type of software. For these reasons, and without forgetting containers, maintaining a software inventory that allows you to identify dangerous packages has become harder to do, but more critical to accomplish.

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Topics: osquery, incident investigation, asset inventory, security hygiene

Checking MDS/Zombieload Mitigations on macOS with Osquery

Posted by Guillaume Ross on 5/15/19 12:46 PM

As a part of a pretty crazy week (Microsoft/RDS, Apple/Mojave/High Sierra, Adobe Acrobat/ Flash Player) when it comes to security updates, some new speculative execution vulnerabilities were disclosed and fixed.

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Topics: osquery tutorial, osquery, macOS, malware, open-source, incident investigation

Remote Desktop Vulnerabilities: Identifying the Exposure and Patch Using Osquery

Posted by Guillaume Ross on 5/15/19 10:13 AM

[Updated June 5th] Patching for the CVE (CVE-2019-0708) vulnerability (referred to as BlueKeep) appears to have been slow, according to Rob Graham among others. One security expert, Ryan McGeehan (@Magoo), with experience in modeling vulnerability exploit probability and has done just that with the BlueKeep security flaw. 

His concerning summary concludes:

"Chances are about even ( 47.62%)  for “in the wild” BlueKeep exploitation to be observed between now and end of June."

Follow the outline below to check your exposure using osquery.

Microsoft released an important patch to the remotely exploitable Remote Desktop Services (RDS) vulnerability. This vulnerability does not require any authentication and allows an attacker to run code remotely. Expect public exploits to start appearing soon.

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Topics: osquery tutorial, osquery, Windows

Detecting Dirty_Sock with Osquery - A Snapd Privilege Escalation Vulnerability

Posted by Guillaume Ross on 2/26/19 11:06 AM

You may have heard about “Dirty Sock”, a recently discovered vulnerability targeting snapd sockets, playing on the name of a previous vulnerability called “Dirty Cow”. Snapd allows for the execution of packaged snaps, which are a mechanism to distribute and update applications in a standard format.

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Topics: osquery tutorial, osquery, malware, open-source, incident investigation

Windows Registry & Osquery: The Easy Way to Ensure Users are Secured

Posted by Guillaume Ross on 1/24/19 10:29 AM

The Windows registry is full of information, and with the proper tools, can be a gold mine for attackers and defenders alike. Attackers look to find specific configurations, credentials, or any information that can help them further attack systems, while defenders can use the registry to ensure that settings are configured as they are expected to. This is something that is not always easy to do with standard tools in Windows, or with the right level of performance. Fortunately, osquery solves that for us.

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Topics: osquery tutorial, osquery, open-source, Windows

One Year Later: Ensuring Windows is Protected from Meltdown+Spectre

Posted by Guillaume Ross on 1/10/19 9:48 AM

2018: The year of speculative execution bugs

A year ago, in January 2018, three hardware vulnerabilities known as Meltdown, Spectre Variant 1, and Spectre Variant 2 were disclosed to the public.

Although disclosure was supposed to occur on January 9, news outlets found updates in the Linux Kernel and broke word early on January 3, kicking off the year with a pretty big headache for IT and security teams across the globe.

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Topics: osquery, system architecture, open-source

Hunting for Evil Launch Daemons - Identifying Suspicious Behavior with Osquery

Posted by Guillaume Ross on 12/18/18 10:05 AM

Last week, Malwarebytes posted an article highlighting new malware discovered by John Lambert (Microsoft), Patrick Wardle (Objective-See and Digita Security) and Adam Thomas (Malwarebytes), and sure enough, persistence using launchd is still a common thing.

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Topics: osquery, macOS, open-source

Vulnerabilities in SSD Encryption: Using osquery to Identify Vulnerable Windows Machines

Posted by Guillaume Ross on 11/12/18 12:32 PM

Dark Reading and Forbes, among various other sources, have recently reported that Windows computers using the hardware encryption feature of many different types of solid-state drives (SSDs) are vulnerable to attacks that defeat it completely. These vulnerabilities, discovered by Radboud University researchers Carlo Meijer and Bernard van Gastel, affect multiple models including some made by the popular brands Crucial and Samsung.

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Topics: Insider, osquery

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