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InformationalSplunk security contentTeoderick Contreras +2

Linux Auditd Possible Access Or Modification Of Sshd Config File

The following analytic detects access, deletion or modification of the ssh_config file on Linux systems. It leverages data from Linux Auditd, focusing on events of type PATH with a nametype of ("NORMAL", "CREATE",…

Description

The following analytic detects access, deletion or modification of the ssh_config file on Linux systems. It leverages data from Linux Auditd, focusing on events of type PATH with a nametype of ("NORMAL", "CREATE", "DELETE"). This activity could be significant because unauthorized changes to ssh_config can allow threat actors to redirect port connections or use unauthorized keys, potentially compromising the system. Correlate this with related EXECVE or PROCTITLE events to identify the process or user responsible for the access or modification. If confirmed malicious, this could lead to unauthorized access, privilege escalation, or persistent backdoor access, posing a severe security risk.

Detection logic

Detection requirements

Platform
ESXiIaaSLinuxmacOSNetwork Devices

The rule states no platform. This is derived from the ATT&CK technique it maps to.

Log source category
linux_auditd_cwdlinux_auditd_path

Known benign triggers

  • Administrator or network operator can use this commandline for automation purposes. Please update the filter macros to remove false positives.

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