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In 2020 ESET published a white paper detailing findings about interconnectivity of the most prominent Latin American families of banking trojans including Casbaneiro, Grandoreiro, Amavaldo among others. Then it is ready to start its core functionality and wait for commands from an operator. After that, Janeleiro retrieves the IP addresses of the C&C servers from a GitHub organization page apparently created by the criminals. The information is uploaded to a website with the purpose of tracking successful attacks.
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If the returned country code value does not match BR, the malware exits.
![njrat 5 dev-point download njrat 5 dev-point download](https://www.trendmicro.com/content/dam/trendmicro/global/en/migrated/security-intelligence-migration-spreadsheet/trendlabs-security-intelligence/2015/01/KJw0rm_fig3-2.png)
Janeleiro retrieves the computer’s public IP address and uses a web service to attempt to geolocate it. Using an MSI installer is a favored technique of several malware families in the region.
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The ZIP archive contains an MSI installer that loads the main trojan DLL. Some other emails sent by these attackers don’t have a redirection via a compromised server but lead directly to the ZIP archive.įigure 2.
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The retrieved page simply redirects to the download of a ZIP archive hosted in Azure. It contains a link that leads to a compromised server. According to our telemetry, the affected sectors are engineering, healthcare, retail, manufacturing, finance, transportation and government.Īn example of a phishing email is shown in Figure 1: a false notification regarding an unpaid invoice. Malicious emails are sent to companies in Brazil and, even though we do not think these are targeted attacks, they seem to be sent in small batches. Having your malware depend on a single source is an interesting move – but what if we told you that the newest version of Janeleiro only lives for one day? Target: Brazilīased on our telemetry data, we can affirm that this malware targets only corporate users. The operators seem comfortable using GitHub to store their modules, administering their organization page, and uploading new repositories every day where they store the files with the lists of C&C servers that the trojans retrieve to connect to their operators.
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The nature of these types of attack is not characterized by their automation capabilities, but rather by the hands-on approach: in many cases the operator must adjust the windows via commands in real time. Janeleiro has been evolving towards the objective of giving more control to the operators to manipulate and adjust its fake pop-up windows based on what they need to pull off the attack, send mouse clicks and keystrokes, and recording user input and the screen in real time. NET, a big deviation from the favored Delphi programming language that threat actors in the region have been using for years. In contrast to those well-known malware families, Janeleiro is written in Visual Basic. Janeleiro follows exactly the same blueprint for the core implementation of this technique as some of the most prominent malware families targeting the region: Casbaneiro, Grandoreiro, Mekotio, Amavaldo, and Vadokrist, among others. These pop-ups contain fake forms, aiming to trick the malware’s victims into entering their banking credentials and personal information that the malware captures and exfiltrates to its C&C servers. This new threat, which we’ve named Janeleiro, attempts to deceive its victims with pop-up windows designed to look like the websites of some of the biggest banks in Brazil. Although we have not received any official response from GitHub, when we checked April 6 th at around 18:00 UTC, the malicious repositories used by Janeleiro had been taken down.ĮSET Research has been tracking a newly discovered banking trojan that has been targeting corporate users in Brazil since 2019 across many verticals affecting sectors such as engineering, healthcare, retail, manufacturing, finance, transportation, and government.