In their first article on the XZ backdoor, Kaspersky researchers analyzed its code from initial infection to the function hooking it performs. As they mentioned then, its initial goal was to successfully hook one of the functions related to RSA key manipulation.
In this article, the research team will focus on the backdoor’s behaviour inside OpenSSH, specifically OpenSSH portable version 9.7p1 – the most recent version at this time. To better understand what’s going on, they recommend you to read Baeldung’s article about SSH authentication methods and JFrog’s article about privilege separation in SSH.
Read more…
Source: Kaspersky
Related:
- How to confuse antimalware neural networks. Adversarial attacks and protection
June 23, 2021
Nowadays, cybersecurity companies implement a variety of methods to discover new, previously unknown malware files. Machine learning (ML) is a powerful and widely used approach for this task. At Kaspersky we have a number of complex ML models based on different file features, including models for static and dynamic detection, for processing sandbox logs and ...
- NukeSped Copies Fileless Code From Bundlore, Leaves It Unused
June 22, 2021
While investigating samples of NukeSped, a remote access trojan (RAT), Trend Micro came across several Bundlore adware samples using the same fileless routine that was spotted in NukeSped. The backdoor has been attributed to the cybercriminal group Lazarus, which has been active since at least 2014. There are multiple variants of NukeSped, which is designed ...
- Bash Ransomware DarkRadiation Targets Red Hat- and Debian-based Linux Distributions
June 17, 2021
A recently discovered Bash ransomware piqued our interest in multiple ways. Upon investigating, we found that the attack chain is fully implemented as a bash script, but it also seems that the scripts are still under development. Most components of this attack mainly target Red Hat and CentOS Linux distributions; however, in some scripts Debian-based Linux ...
- Matanbuchus: Malware-as-a-Service with Demonic Intentions
June 16, 2021
Unit 42 researchers often spend time investigating what we call non-traditional sources. Non-traditional sources often include underground marketplaces and sites, spanning from forums on the Tor network to Telegram channels and other marketplaces. One such case that we investigated involves a threat actor called BelialDemon, who is a member of several underground forums and marketplaces. In ...
- Ferocious Kitten: 6 years of covert surveillance in Iran
June 16, 2021
Ferocious Kitten is an APT group that since at least 2015 has been targeting Persian-speaking individuals who appear to be based in Iran. Although it has been active for a long time, the group has mostly operated under the radar and has not been covered by security researchers to the best of our knowledge. It ...
- Paradise Ransomware source code released on a hacking forum
June 15, 2021
The complete source code for the Paradise Ransomware has been released on a hacking forum allowing any would-be cyber criminal to develop their own customized ransomware operation. Released on the hacking forum XSS, the link to the source code is only accessible to active users on the site who have previously replied to or reacted to ...