IMPORTANT: No additional bug fixes or documentation updates will be released for this version. For the latest information, see the current release documentation.

« Setuid / Setgid Bit Set via chmod SharePoint Malware File Upload »

› › ›

Shadow File Read via Command Line Utilities

edit

Shadow File Read via Command Line Utilities

edit

Identifies the manual reading of the /etc/shadow file via the commandline using standard system utilities. Threat actors will attempt to read this file, after elevating their privileges to root, in order to gain valid credentials they can utilize to move laterally undetected and access additional resources.

Rule type: eql

Rule indices:

auditbeat-*
logs-endpoint.events.*

Severity: medium

Risk score: 47

Runs every: 5 minutes

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

Maximum alerts per execution: 100

Tags:

Elastic
Host
Linux
Threat Detection
Privilege Escalation

Version: 1

Added (Elastic Stack release): 8.5.0

Rule authors: Elastic

Rule license: Elastic License v2

Rule query

edit

process where event.type == "start" and event.action == "exec" and
user.name == "root" and process.args : "/etc/shadow" and not
process.executable: ("/usr/bin/find", "/usr/bin/cmp", "/bin/ls",
"/usr/sbin/restorecon", "/usr/bin/uniq") and not
process.parent.executable: "/bin/dracut"

Threat mapping

edit

Framework: MITRE ATT&CK^TM

Tactic:
- Name: Privilege Escalation
- ID: TA0004
- Reference URL: https://attack.mitre.org/tactics/TA0004/
Technique:
- Name: Exploitation for Privilege Escalation
- ID: T1068
- Reference URL: https://attack.mitre.org/techniques/T1068/

« Setuid / Setgid Bit Set via chmod SharePoint Malware File Upload »