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Active Rule
CVE-2023-38331 Exploitation Attempt - Suspicious WinRAR Child Process
Target Profile
Splunk
Splunk SPL & tstats data model queries
Format Mode
Default
Plain SPL queries
Conversion Output
CVE-2023-38331 Exploitation Attempt - Suspicious WinRAR Child Process
Using Splunk · Default · sigma-cli 2.0.2
Translation controls
Adjust the rule on the left, then regenerate when you want a fresh backend-native query.
BackendSplunkFormatDefaultVersion2.0.2
title: CVE-2023-38331 Exploitation Attempt - Suspicious WinRAR Child Process
id: ec3a3c2f-9bb0-4a9b-8f4b-5ec386544343
related:
- id: e4556676-fc5c-4e95-8c39-5ef27791541f
type: similar
status: test
description: Detects exploitation attempt of CVE-2023-38331 (WinRAR before v6.23), where an attacker can leverage WinRAR to execute arbitrary commands and binaries.
references:
- https://www.group-ib.com/blog/cve-2023-38831-winrar-zero-day/
- https://github.com/knight0x07/WinRAR-Code-Execution-Vulnerability-CVE-2023-38831/blob/26ab6c40b6d2c09bb4fc60feaa4a3a90cfd20c23/Part-1-Overview.md
author: Nasreddine Bencherchali (Nextron Systems), Andreas Braathen (mnemonic.io)
date: 2023-08-30
modified: 2024-01-22
tags:
- detection.emerging-threats
- attack.execution
- attack.t1203
- cve.2023-38331
logsource:
category: process_creation
product: windows
detection:
selection_parent:
ParentImage|endswith: '\WinRAR.exe'
selection_folder:
CommandLine|contains: '\AppData\Local\Temp\Rar$'
selection_double_ext:
CommandLine|re: '\.[a-zA-Z0-9]{1,4} \.'
selection_binaries:
# Note: add additional binaries that the attacker might use
- Image|endswith:
- '\cmd.exe'
- '\cscript.exe'
- '\powershell.exe'
- '\pwsh.exe'
- '\wscript.exe'
- OriginalFileName:
- 'Cmd.Exe'
- 'cscript.exe'
- 'PowerShell.EXE'
- 'pwsh.dll'
- 'wscript.exe'
condition: all of selection_*
falsepositives:
- Unlikely
level: high
CLI command
Copy the exact command to reproduce this translation locally.
sigma convert --without-pipeline -t splunk -f default rules-emerging-threats/2023/Exploits/CVE-2023-38831/proc_creation_win_exploit_cve_2023_38831_winrar_child_proc.yml