![]() In addition, the coincidental timing of this second malware emerging right after CS_Installer/ChromeLoader died down would lead us to hypothesize that they are the same malware, the second variant being an evolution of the first. The naming convention of the scheduled tasks used by both samples to gain persistence was also very similar to Chromeloader. While the initial infection techniques and the contents of these two malware types are different, the objective is the same: to gather user data and track browsing activity while feeding adware. This payload which would be the main malware file moving forward has varying names, some of the most common ones are mentioned below. This recent malware relies on a batch script in the mounted drive to install the second stage payload also delivered within the same ISO and start infection. While this was also delivered via ISO files, there were differences in execution. NET executable by the same name to kick off the infection chain and install the malicious chrome extension.ĬS_Installer activity died down for a bit and soon after a similar malware emerged. CS_installer was also known as ChromeLoader as that was one of the names of the scheduled task the malware created. The malware ultimately aimed to install a Chrome extension that acted as a browser hijacker, gathering personal information and tracking the user’s browsing activity. CS_installer used ISO image file downloads and relied on user execution to initiate infection. HistoryĪt the beginning of January 2022, the malware CS_installer was seen in the wild targeting Chrome browsers. In this article, the VMware Carbon Black MDR team will show evidence of such attacks happening. This can eventually lead to much more devastating attacks such as ransomware. Unit 42 researchers have found evidence of The Real First Windows Variant using the AHK(AutoHotKey) tool to compile a malicious executable and drop version 1.0 of the malware.Īlthough this sort of malware is created with an intent to feed adware to the user, ChromeLoader also increases the attack surface of an infected system. There are some variants known to ChromeLoader, including ChromeBack and Choziosi Loader. The VMware Carbon Black Managed Detection and Response (MDR) team observed the first Windows variants of ChromeLoader in the wild in January 2022 and the macOS version in March 2022. iso and can be used to leak users’ browser credentials, harvest recent online activity and hijack the browser searches to display ads. ChromeLoader proves to be an extremely prevalent and persistent malware.
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