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The Hidden Bee infection chain, part 1: the stegano pack

About a year ago, we described the Hidden Bee miner delivered by the Underminer Exploit Kit. Hidden Bee has a complex and multi-layered internal structure that is unusual among cybercrime toolkits, making it an interesting phenomenon on the threat landscape. That’s why we’re dedicating a series of posts to exploring particular elements and updates made during one year of its … [Read more...]

A week in security (May 27 – June 2)

Last week on Malwarebytes Labs, we took readers through a deep dive—way down the rabbit hole—into the novel malware called “Hidden Bee.” We also looked at the potential impact of a government agency’s privacy framework, and delivered to readers everything they needed to know about ATM attacks and fraud. Lastly, amidst continuing news about the City of Baltimore suffering a ransomware attack, we … [Read more...]

Hidden Bee: Let’s go down the rabbit hole

Some time ago, we discussed the interesting malware, Hidden Bee. It is a Chinese miner, composed of userland components, as well as of a bootkit part. One of its unique features is a custom format used for some of the high-level elements (this format was featured in my recent presentation at SAS). Recently, we stumbled upon a new sample of Hidden Bee. As it turns out, its authors decided to … [Read more...]

Reversing malware in a custom format: Hidden Bee elements

Malware can be made of many components. Often, we encounter macros and scripts that work as malicious downloaders. Some functionalities can also be achieved by position-independent code—so-called shellcode. But when it comes to more complex elements or core modules, we almost take it for granted that it will be a PE file that is a native Windows executable format. The reason for this is simple: It … [Read more...]

A week in security (July 23 – July 29)

Last week on Labs, we looked at an adware called MobiDash getting stealthy, a new strain of Mac malware called Proton that was found after two years, and the ‘Hidden Bee’ miner that was delivered via an improved drive-by download toolkit. We also delved into the security improvements expected in the new Android P, and had a fresh look at Trojans to help users define what they really are. We also … [Read more...]

‘Hidden Bee’ miner delivered via improved drive-by download toolkit

This blog post was authored by @hasherezade and Jérôme Segura. We recently detected a drive-by a download attempt trying to exploit CVE-2018-4878, a vulnerability in Flash Player, in a sequence that was not matching any of the exploit kit patterns that we currently track. Upon investigation, we discovered something that was new to us, but is part of an existing exploitation framework discovered in … [Read more...]