VB2018 paper: Office bugs on the rise

Posted by   Martijn Grooten on   Dec 14, 2018

A large portion of today's malware infections use malicious Office documents as a first-stage payload. Typically, the user is tricked into enabling macros or disabling some security protection, after which the next-stage payload is downloaded and executed.

However, a different kind of Office malware targets outdated versions of Microsoft Office, which continue to be widely used. These files are usually generated using an exploit builder. Analogous to exploit kits targeting web users, such builders attempt to exploit a number of vulnerabilities, hoping that at least one will work.

One of several active exploit builders is Threadkit. Sold on the cybercrminal underground for US$800, it was first reported on by Proofpoint in March of this year. Threadkit is the most prevalent exploit builder at the moment, and is utilised in about a third of such attacks. It has been used in some intensive campaigns to deliver the notorious Trickbot malware.

Szappanos-Fig2.jpgExploit builder utilisation in attacks, from Gábor Szappanos's VB2018 paper.

New research by Fidelis (pdf) has looked at a new version of Threadkit that has been used by the 'Cobalt' group. This prominent cybercrime group, also known as 'Carbanak', has targeted banks in Eastern Europe and has become active again despite the arrest of its alleged mastermind earlier this year.

At VB2018 in Montreal this year, Sophos researcher Gábor Szappanos presented a paper on Office exploit builders in which he provided a detailed overview of all the active builders. The paper looked in particular at CVE-2017-0199, one of the vulnerabilities often exploited by this kind of malware; it was also used in the latest Threadkit campaign.

Gábor has long studied such builders; he discussed them in a paper presented at VB2017 last year, when he also won the Péter Szőr award for previously published research on the now disappeared AKbuilder (pdf).

Today, we have published Gábor's VB2018 paper in both HTML and PDF format. We have also uploaded the video of his presentation to our YouTube channel.

twitter.png
fb.png
linkedin.png
hackernews.png
reddit.png

 

Latest posts:

VB2019 call for papers - now open!

Have you analysed a new online threat? Do you know a new way to defend against such threats? Are you tasked with securing systems and fending off attacks? The call for papers for VB2019 is now open and we want to hear from you!

VB2018 paper: Unpacking the packed unpacker: reversing an Android anti-analysis library

Today, we publish a VB2018 paper by Google researcher Maddie Stone in which she looks at one of the most interesting anti-analysis native libraries in the Android ecosystem. We also release the recording of Maddie's presentation.

VB2018 paper: Draw me like one of your French APTs – expanding our descriptive palette for cyber threat actors

Today, we publish the VB2018 paper by Chronicle researcher Juan Andres Guerrero-Saade, who argues we should change the way we talk about APT actors.

Book Review: Cyber Wars

VB Editor Martijn Grooten reviews Charles Arthur's Cyber Wars, which looks at seven prominent hacks and attacks, and the lessons we can learn from them.

VB2018 paper: Office bugs on the rise

At VB2018 Sophos researcher Gábor Szappanos provided a detailed overview of Office exploit builders, and looked in particular at the widely exploited CVE-2017-0199. Today we publish his paper and release the video of his presentation.

We have placed cookies on your device in order to improve the functionality of this site, as outlined in our cookies policy. However, you may delete and block all cookies from this site and your use of the site will be unaffected. By continuing to browse this site, you are agreeing to Virus Bulletin's use of data as outlined in our privacy policy.