Elastic medium deprecated eql

Deprecated - Remote File Creation on a Sensitive Directory

Discovery of files created by a remote host on sensitive directories and folders. Remote file creation in these directories could indicate a malicious binary or script trying to compromise the system.

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Detection Logic

file where event.action in ("creation", "modification") and
  not user.name:("SYSTEM", "root") and
  process.name in ("System", "scp", "sshd", "smbd", "vsftpd", "sftp-server") and
  (
    file.path : (
        "?:\\Users\\*\\AppData\\Roaming*", "?:\\Program Files*",
        "?:\\Windows\\*", "?:\\Windows\\System\\*",
        "?:\\Windows\\System32\\*", "/etc/*", "/tmp*",
        "/var/tmp*", "/home/*/.*", "/home/.*", "/usr/bin/*",
        "/sbin/*", "/bin/*", "/usr/lib/*", "/usr/sbin/*",
        "/usr/share/*", "/usr/local/*", "/var/lib/dpkg/*",
        "/lib/systemd/*"
    )
)

Field Validations

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