BeyondTrust

Security in Context: The BeyondTrust Blog

Welcome to Security in Context

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

Batchwiper: How I Learned to Worry Less and Love Least Privilege Security

Posted December 19, 2012    BeyondTrust Research Team

With news coming from Iran’s CERT of a nasty (but not really nasty) new piece of malware designed to wipe drives and desktop contents on a specific date, we took the straightforward approach of examining what common, easily implemented security best practices could have stopped Batchwiper in its tracks…

As far as malware goes, Batchwiper is very rudimentary in its execution and capabilities, yet it still has the capacity to cause damage – so how might someone defend themselves from Batchwiper? Simple: run with least privileges. Running as non-administrator effectively neutralizes the dropper component of Batchwiper, specifically GrooveMonitor.exe (MD5 – f3dd76477e16e26571f8c64a7fd4a97b). The dropper is a self-extracting archive, which attempts to put files in the \WINDOWS\system32\ folder. If you’re running as non-admin, the dropper has no permissions to write to that location and the malware will simply fail to execute its intended payloads.

Batchwiper stymied by least privilege.

Least privilege defeats Batchwiper dropper.

If you are unfortunate enough to have a corporate IT environment that does not properly manage Administrative privileges, then the dropper will continue to execute by spawning a series of processes. This eventually leads to Batchwiper formatting drives D through I, performing a Disk Check on each drive (possibly to mask the cause of the data loss), and then deleting the current user profile’s desktop contents.

Batchwiper process list.

Batchwiper processes spawned by dropper.

This malware serves as another example in a long line of threats that are, in most cases, completely (if not severely) mitigated by good security configuration best practices such as practicing Least Privilege.

BeyondTrust has been at the forefront of championing the cause of Least Privilege for quite some time through our BeyondTrust PowerBroker solutions for both Windows and Unix/Linux. Customers leveraging BeyondTrust’s PowerBroker for Windows will mitigate a large majority of malware that affects companies on a day-to-day basis, including this recent Batchwiper malware. You can find out more about our Least Privilege solutions here: http://www.beyondtrust.com/Products/PowerBrokerForWindows/

Leave a Reply

Additional articles

How To Implement The Australian Signals Directorate’s Top 4 Strategies

Posted October 20, 2014    Morey Haber

The Australian Signals Directorate (ASD), also known as the Defence Signals Directorate, has developed a list of strategies to mitigate targeted cyber intrusions. The recommended strategies were developed through ASD’s extensive experience in operational cyber security, including responding to serious security intrusions and performing vulnerability assessments and penetration testing for Australian government agencies. These recommendations…

Tags:
, , , ,
asp-mvc

Exploiting MS14-059 because sometimes XSS is fun, sometimes…

Posted October 17, 2014    BeyondTrust Research Team

This October, Microsoft has provided a security update for System.Web.Mvc.dll which addresses a ‘Security Feature Bypass’. The vulnerability itself is in ASP.NET MVC technology and given its wide adoption we thought we would take a closer look. Referring to the bulletin we can glean a few useful pieces of information: “A cross-site scripting (XSS) vulnerability exists…

Tags:
4bestpracticesaudits-blog

Four Best Practices for Passing Privileged Account Audits

Posted October 16, 2014    Chris Burd

Like most IT organizations, your team may periodically face the “dreaded” task of being audited. Your process for delegating privileged access to desktops, servers, and infrastructure devices is a massive target for the auditor’s microscope. An audit’s findings can have significant implications on technology and business strategy, so it’s critical to make sure you’re prepared…

Tags:
, , , ,