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Vidar and GandCrab: stealer and ransomware combo observed in the wild

Vidar and GandCrab: stealer and ransomware combo observed in the wildWe have been tracking a prolific malvertising campaign for several weeks and captured a variety of payloads, including several stealers. One that we initially identified as Arkei turned out to be Vidar, a new piece of malware recently analyzed in detail by Fumik0_ in his post: Let’s …

  • 04 Jan 2019
4 min read
Vidar and GandCrab: stealer and ransomware combo observed in the wild
We have been tracking a prolific malvertising campaign for several weeks and captured a variety of payloads, including several stealers. One that we initially identified as Arkei turned out to be Vidar, a new piece of malware recently analyzed in detail by Fumik0_ in his post: Let’s dig into Vidar – An Arkei Copycat/Forked Stealer (In-depth analysis). In Norse Mythology, Víðarr is a god and son of Odin, whose death it is foretold he will avenge. Being referred to as “The Silent One” seems to be fitting for this stealer that can loot from browser histories (including Tor Browser) and cryptocurrency wallets, capture instant messages, and much more. We witnessed a threat actor using the Fallout exploit kit to distribute Vidar. But victims won’t notice that as much, as the secondary and noisier payload being pushed is GandCrab ransomware. Overview A malvertising chain leads us to the Fallout exploit kit followed by what we thought was an Arkei stealer. Upon closer look, while the sample did share a lot of similarities with Arkei (including network events), it was actually a newer and, at the time, not yet publicly described piece of malware now identified as Vidar. Beyond Vidar’s stealer capabilities, we also noticed a secondary payload that was retrieved from Vidar’s own command and control (C2) server. The infection timeline showed that victims were first infected with Vidar, which tried to extract confidential information, before eventually being compromised with the GandCrab ransomware. Malvertising and Fallout exploit kit Torrent and streaming video sites drive a lot of traffic, and their advertising is often aggressive and poorly-regulated. A malicious actor using a rogue advertising domain is redirecting these site visitors according to their geolocation and provenance to at least two different exploit kits (Fallout EK and GrandSoft EK), although the former is the most active. Stealers such as AZORult seem to be the a favorite payload here, but we also noticed that Arkei/Vidar was quite common. In this particular instance, we saw Vidar being pushed via the Fallout exploit kit. Vidar It should be noted that Vidar is sold as a product, and as such can be distributed by several different threat groups through different campaigns. Vidar customers can customize the stealer via profiles, which gives them a way to adjust which kind of data they are interested in. Beyond the usual credit card numbers and other passwords stored in applications, Vidar can also scrape an impressive selection of digital wallets. Upon execution on the system, Vidar will search for any data specified in its profile configuration and immediately send it back to the C2 server via an unencrypted HTTP POST request. This includes high level system details (specs, running
Source: Malware BytesPublished on 2019-01-04
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  • 04 Jan 2019

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