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Linux Auditd Preload Hijack Library Calls
The following analytic detects the use of the LD_PRELOAD environment variable to hijack or hook library functions on a Linux platform. It leverages data from Linux Auditd, focusing on process execution logs that include command-line details. This activity is significant because adversaries, malware authors, and red teamers commonly use this technique to gain elevated privileges and establish persistence on a compromised machine. If confirmed malicious, this behavior could allow attackers to execute arbitrary code, escalate privileges, and maintain long-term access to the system.
Detection Logic
`linux_auditd` execve_command = "*LD_PRELOAD*"
| rename host as dest
| rename comm as process_name
| rename exe as process
| stats count min(_time) as firstTime max(_time) as lastTime
BY argc execve_command dest
| `security_content_ctime(firstTime)`
| `security_content_ctime(lastTime)`
| `linux_auditd_preload_hijack_library_calls_filter`False Positives
- ⚠ Administrator or network operator can execute this command. Please update the filter macros to remove false positives.
Field Validations
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