Modification of OpenSSH Binariesedit

Adversaries may modify SSH related binaries for persistence or credential access by patching sensitive functions to enable unauthorized access or by logging SSH credentials for exfiltration.

Rule type: query

Rule indices:

  • auditbeat-*
  • logs-endpoint.events.*

Severity: medium

Risk score: 47

Runs every: 5m

Searches indices from: now-9m (Date Math format, see also Additional look-back time)

Maximum alerts per execution: 100

References:

Tags:

  • Elastic
  • Host
  • Linux
  • Threat Detection
  • Credential Access
  • Persistence

Version: 3

Rule authors:

  • Elastic

Rule license: Elastic License v2

Rule queryedit

event.category:file and event.type:change and
 process.name:* and
 (file.path:(/usr/sbin/sshd or /usr/bin/ssh or /usr/bin/sftp or /usr/bin/scp) or file.name:libkeyutils.so) and
 not process.name:("dpkg" or "yum" or "dnf" or "dnf-automatic")

Framework: MITRE ATT&CKTM