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Exploiting servers with critical CVEs: The server can be patchedīecause of how difficult the exploitation can be, an attacker would want to make the most out of their initial access.Using leaked credentials and keys: The passwords might be reset or the keys are revoked.You’d have to send another email and hope the victim will fall for it again. ![]() To do this, they install backdoor access that reliably maintains access to the compromised machine even after reboots. With persistence installed, the attacker no longer needs to rely on exploitation to regain access to the system. Linux Logging and Auditing File Integrity Monitoring He might simply use the added account in the machine or wait for the reverse shell from an installed service. The configuration changes needed to set up persistence usually require the attacker to touch the machine’s disk such as creating or modifying a file. This gives us an opportunity to catch the adversaries if we are able to lookout for file creation or modification related to special files of directories. ![]() Auditbeat’s File Integrity Monitoring: įor the blog posts, we will be using mainly auditd, and auditbeats jointly.įor example, if we are trying to detect installation of services, we might want to look for newly added service files in /etc/systemd/system and other related directories.Two powerful tools to monitor the different processes in the OS are: #OSQUERY ARCHITECTURE HOW TO#įor instructions on how to set up auditd and auditbeats see A02 in the appendix.Īuditd and Sysmon What are sysmon and auditd?
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