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File or Folder Permissions Change

Sigma Rules

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Summary
This detection rule monitors changes to file and folder permissions on Linux systems using the audit daemon (auditd). It specifically looks for execution events (EXECVE) that involve the commands 'chmod' and 'chown', which are commonly used for modifying permissions and ownership of files or directories. The purpose of this rule is to identify potential unauthorized changes that could be indicative of malicious activities, such as privilege escalation or preparation for data exfiltration. Since legitimate user interactions with file permissions can trigger this rule, it is important to account for false positives that arise from normal user behaviors within a given operational context. The detection integrates with existing audit logging mechanisms inherent to Linux, thus providing alerting capabilities while facilitating compliance and auditing efforts.
Categories
  • Linux
  • On-Premise
  • Infrastructure
Data Sources
  • File
  • Process
  • Logon Session
ATT&CK Techniques
  • T1222.002
Created: 2019-09-23