name: Windows Query Registry Reg Save
id: cbee60c1-b776-456f-83c2-faa56bdbe6c6
version: 1
date: '2022-12-12'
author: Teoderick Contreras, Splunk
status: production
type: Hunting
description: The following analytic identifies a process execution of reg.exe with
  "save" parameter. This reg.exe parameter is commonly being abused by threat actors,
  adversaries and red-teamers to dump credentials or to check the registry modification
  capabilities of certain users or administrators in targeted hosts. This approach
  was seen in post-exploitation tool like winpeas where it uses "reg save" and "reg
  restore" to check registry modification restriction in targeted host after gaining
  access to it.
data_source:
- Sysmon Event ID 1
search:
  selection1:
    OriginalFileName: reg.exe
  selection2:
    Image|endswith: reg.exe
  selection3:
    CommandLine: '* save *'
  condition: (selection1 or selection2) and selection3
how_to_implement: To successfully implement this search, you need to be ingesting
  logs with the process name, parent process, and command-line executions from your
  endpoints. If you are using Sysmon, you must have at least version 6.0.4 of the
  Sysmon TA. Tune and filter known instances of wermgr.exe may be used.
known_false_positives: network administrator can use this command tool to backup registry
  before updates or modifying critical registries.
references:
- https://learn.microsoft.com/en-us/windows-server/administration/windows-commands/quser
- https://github.com/carlospolop/PEASS-ng/tree/master/winPEAS
- https://www.microsoft.com/en-us/security/blog/2022/10/14/new-prestige-ransomware-impacts-organizations-in-ukraine-and-poland/
tags:
  analytic_story:
  - Windows Post-Exploitation
  - Prestige Ransomware
  asset_type: Endpoint
  confidence: 30
  impact: 30
  message: execution of process $process_name$ in $dest$
  mitre_attack_id:
  - T1012
  observable:
  - name: dest
    type: Hostname
    role:
    - Victim
  - name: user
    type: User
    role:
    - Victim
  product:
  - Splunk Enterprise
  - Splunk Enterprise Security
  - Splunk Cloud
  risk_score: 9
  security_domain: endpoint
tests:
- name: True Positive Test
  attack_data:
  - data: https://media.githubusercontent.com/media/splunk/attack_data/master/datasets/malware/winpeas/sysmon.log
    source: XmlWinEventLog:Microsoft-Windows-Sysmon/Operational
    sourcetype: xmlwineventlog
    update_timestamp: true