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Security in Context: The BeyondTrust Blog

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Bringing you news and commentary on solutions and strategies for protecting critical IT infrastructure in the context of your business.

Least Privilege and South Korea

Posted March 26, 2013    BeyondTrust Research Team

No, this isn’t some editorial piece about the interrelationships of varying social strata in South Korean society and Gangnam Style. Despite how interesting that may be, we are instead taking a quick look at the latest “wiper” malware to strike fear in the hearts of CTOs and IT admins alike – DarkSeoul (or Jokra or KillMBR, depending on who you ask). If you haven’t heard of DarkSeoul, here’s what you need to know:

– Trojan that wipes out harddrives
– Targeted banks and media organizations in South Korea
– No Command and Control functionality (fire and forget)
– Wiping set to commence on March 20th
– Cross-platform (Windows, UNIX, and Linux)

Well, that was short… what’s all the ruckus about then? Just as with Batchwiper, running in a Least Privilege environment would have significantly reduced the effectiveness of DarkSeoul, if not completely disabled it. In the case of this malware, the Trojan siphons credentials from mRemote and SecureCRT installations on Windows systems, looking for root credentials to UNIX and Linux boxes. In a Least Privilege environment, and in an environment managed by tools such as PowerBroker Servers for Linux & Unix (PBUL), IT can make smarter, granular decisions about what certain accounts can do. This is especially critical on infrastructural systems, which often run Linux and UNIX, responsible for production roles and other critical functionality in the enterprise environment. PBUL lets you restrict access to certain functions and system calls, which can be leveraged to potentially prevent any user from deleting critical directories, such as home and kernel. Not to mention, running in a Least Privilege environment within Windows, with the use of PowerBroker for Windows, would have hamstrung DarkSeoul even further. Running as a non-administrator within Windows severely limits malware’s capabilities, including deleting system-critical directories.

TL;DR? An ounce of prevention is worth a pound of cure… or in this case, an ounce of prevention prevents all your files from getting deleted and breaking your ATMs.

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Posted November 24, 2014    Scott Lang

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Patented Windows privilege management brings you unmatched benefits

Posted November 24, 2014    Scott Lang

We are pleased to announce that BeyondTrust has been granted a new U.S. Patent (No. 8,850,549) for privilege management, validating our approach to helping our customers achieve least privilege in Windows environments. The methods and systems that we employ for controlling access to resources and privileges per process are unique to BeyondTrust PowerBroker for Windows….

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A Quick Look at MS14-068

Posted November 20, 2014    BeyondTrust Research Team

Microsoft recently released an out of band patch for Kerberos.  Taking a look at the Microsoft security bulletin, it seems like there is some kind of issue with Kerberos signatures related to tickets. Further information is available in the Microsoft SRD Blogpost So it looks like there is an issue with PAC signatures.  But what…

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