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MediumSplunk security contentRaven Tait +1

Linux Suspicious Namespace Creation

The following analytic detects an unprivileged user invoking the unshare syscall with user namespace flags followed within 120 seconds by a root-owned shell or interpreter spawning under the same parent process,…

Description

The following analytic detects an unprivileged user invoking the unshare syscall with user namespace flags followed within 120 seconds by a root-owned shell or interpreter spawning under the same parent process, correlating auditd syscall telemetry with Sysmon process creation events to identify the two-step sequence characteristic of user-namespace-based Linux kernel privilege escalation exploits such as DirtyFrag.

Detection logic

Detection requirements

Platform
ContainersLinuxmacOSWindows

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

Log source category
linux_auditd_syscallsysmon_for_linux_eventid_1

Known benign triggers

  • No false positives have been identified at this time.

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