Paper: How It Works: Steganography Hides Malware in Image Files

Posted by   Martijn Grooten on   Apr 28, 2016

Sometimes a picture says more than a thousand words. And sometimes in computer security, a picture contains a thousand words, or rather a lot of commands, used by malware authors to remotely control the malware.

This is an example of a technique known as 'steganography': hiding data in such a way that it is invisible to the unsuspecting observer. The technique has already been used in malware by Duqu and some Zeus/Zbot variants, and became prominent last year when it was used by a piece of malware called Stegoloader (also known as Gatak), which used code embedded into (rather than appended to) a PNG image.

Today, we publish a paper (also available as PDF) by CYREN researcher Lordian Mosuela, who analyses a Stegoloader sample.

The paper is worth reading, not just for those who are dealing with this particular malware, but for all malware analysts, given that steganography may well become more common in the future.




Latest posts:

VB2019 paper: Fantastic Information and Where to Find it: A guidebook to open-source OT reconnaissance

A VB2019 paper by FireEye researcher Daniel Kapellmann Zafra explained how open source intelligence (OSINT) can be used to learn crucial details of the inner workings of many a system. Today we publish Daniel's paper and the recording of his…

VB2019 paper: Different ways to cook a crab: GandCrab Ransomware-as-a-Service (RaaS) analysed in depth

Though active for not much longer than a year, GandCrab had been one of the most successful ransomware operations. In a paper presented at VB2019 in London, McAfee researchers John Fokker and Alexandre Mundo looked at the malware code, its evolution…

VB2019 paper: Domestic Kitten: an Iranian surveillance program

At VB2019 in London, Check Point researchers Aseel Kayal and Lotem Finkelstein presented a paper detailing an Iranian operation they named 'Domestic Kitten' that used Android apps for targeted surveillance. Today we publish their paper and the video…

VB2019 video: Discretion in APT: recent APT attack on crypto exchange employees

At VB2019 in London, LINE's HeungSoo Kang explained how cryptocurrency exchanges had been attacked using Firefox zero-days. Today, we publish the video of his presentation.

VB2019 paper: DNS on fire

In a paper presented at VB2019, Cisco Talos researchers Warren Mercer and Paul Rascagneres looked at two recent attacks against DNS infrastructure: DNSpionage and Sea Turtle. Today we publish their paper and the recording of their 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.