How they can know the hacker group, they left a business card?
this post was submitted on 15 Sep 2023
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The Kaspersky analysis noted that the malware contained comments in the shell scripts written in Ukrainian and Russian, and used malware components detected in previous malware campaigns since 2013 that presumably have been attributed to a specific group.
FTA:
Meanwhile, the postinst script contains comments in Russian and Ukrainian, including information about improvements made to the malware, as well as activist statements. They mention the dates 20200126 (January 26, 2020) and 20200127 (January 27, 2020).
...
Having established how the infected Free Download Manager package was distributed, we decided to check whether the implants discovered over the course of our research have code overlaps with other malware samples. It turned out that the crond backdoor represents a modified version of a backdoor called Bew. Kaspersky security solutions for Linux have been detecting its variants since 2013.
...
The Bew backdoor has been analyzed multiple times, and one of its first descriptions was published in 2014. Additionally, in 2017, CERN posted information about the BusyWinman campaign that involved usage of Bew. According to CERN, Bew infections were carried out through drive-by downloads.
As for the stealer, its early version was described by Yoroi in 2019. It was used after exploitation of a vulnerability in the Exim mail server.
How do actors detect other actors? Ever heard of how Team Blue ops work?
Until yesterday they even didn't know that they were hacked for years, then cleaned the file by accident when doing automatic updates; now they know who did that. Seems a way to shift blame
Have you read the code? Ukrainian clowns were behind this, just like the node-ipc NPM incident. There is a thread on HN about it as well, if you want to read.