“Funky malware format” found in Ocean Lotus sample
April 19, 2019 - Recently, one of our researchers presented at the SAS conference on "Funky malware formats"—atypical executable formats used by malware that are only loaded by proprietary loaders. In this post, we analyze one of those formats in a sample called Ocean Lotus from the APT 32 threat group in Vietnam.
What’s new in TrickBot? Deobfuscating elements
November 12, 2018 - TrickBot has been present in the threat landscape from quite a while. We wrote about its first version in October 2016. October 2018 marks end of the second year since TrickBot’s appearance. Possibly the authors decided to celebrate the anniversary by a makeover of some significant elements of the core. This post is an analysis of the updated obfuscation used by TrickBot’s main module.
Reversing malware in a custom format: Hidden Bee elements
August 30, 2018 - When we recently analyzed payloads related to Hidden Bee (dropped by the Underminer EK), we noticed something unusual. After reversing the malware, we discovered that its authors actually created their own executable format. Follow our step-by-step analysis for a closer look.
Fileless malware: getting the lowdown on this insidious threat
August 29, 2018 - In this series of articles, we provide an in-depth discussion of fileless malware and their related attacks. In part one, we cover a brief overview of the problems with and general features of fileless malware, laying the groundwork for technical analysis of various samples employing fileless and semi-fileless methods.
Process Doppelgänging meets Process Hollowing in Osiris dropper
August 13, 2018 - Process doppleganging, a rare technique of impersonating a process, was discovered last year, but hasn't been seen much in the wild since. It was an interesting surprise, then, to discover its use mixed in with Process Hollowing, yet another technique, in a dropper for the Osiris banking Trojan.