CVE-2023-40477 Potential Exploitation - .REV File Creation

Description

Detects the creation of ".rev" files by WinRAR. Could be indicative of potential exploitation of CVE-2023-40477. Look for a suspicious execution shortly after creation or a WinRAR application crash.

Query · sigma

selection:
  Image|endswith:
  - \explorer.exe
  - \WinRAR.exe
  TargetFilename|endswith: .rev
condition: selection

Known false positives

  • Legitimate extraction of multipart or recovery volumes ZIP files
Raw source CVE-2023-40477 Potential Exploitation - .REV File Creation · Sigma
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Published by SigmaHQ/sigma ↗, licensed under Detection Rule License 1.1 ↗. Reproduced here unmodified. 
title: CVE-2023-40477 Potential Exploitation - .REV File Creation
id: c3bd6c55-d495-4c34-918e-e03e8828c074
status: test
description: Detects the creation of ".rev" files by WinRAR. Could be indicative of potential exploitation of CVE-2023-40477. Look for a suspicious execution shortly after creation or a WinRAR application crash.
references:
    - https://wildptr.io/winrar-cve-2023-40477-poc-new-vulnerability-winrar-security-research/
    - https://github.com/wildptr-io/Winrar-CVE-2023-40477-POC
    - https://www.rarlab.com/vuln_rev3_names.html
author: Nasreddine Bencherchali (Nextron Systems)
date: 2023-08-31
tags:
    - attack.execution
    - cve.2023-40477
    - detection.emerging-threats
logsource:
    category: file_event
    product: windows
detection:
    selection:
        Image|endswith:
            - '\explorer.exe' # When extracted via context menu
            - '\WinRAR.exe'
        TargetFilename|endswith: '.rev'
    condition: selection
falsepositives:
    - Legitimate extraction of multipart or recovery volumes ZIP files
level: low

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