ARJ archives can be unpacked with various tools like 7-Zip or WinRAR. This made it easier to share these files over dial-up connections. ARJ can split the archive into multiple smaller files. ARJ is an early 1990s archive format often used on the pirated software scene to convert files into archives. The campaigns we analyzed started with a malicious email similar to the one below:Īn ARJ archive is attached to this email. Any internet user is a potential target of this malware, and if infected, has the potential to completely take away a user's online privacy. In this post, we'll walk through one of these campaigns in detail and how the different stages of the dropper hide the malware. ![]() The injection techniques we're seeing in the wild are well-known and have been used for many years, but with the adversaries customizing them, traditional anti-virus systems are having a hard time detecting the embedded malware. Once infected, the malware can steal information from many popular pieces of software, including the Google Chrome, Safari and Firefox web browsers. The adversaries using custom droppers, which inject the final malware into common processes on the victim machine. But information-stealing malware can operate in the background of infected systems, looking to steal users' passwords, track their habits online and hijack personal information.Ĭisco Talos has monitored adversaries which are behind a wave of ongoing campaigns dropping well-known information-stealer like Agent Tesla, Loki-bot and others since at least January 2019. Most users assume they are safe when surfing the web on a daily basis.
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