title: Suspicious 7zip Subprocess
id: 9a4ccd1a-3526-4d99-b980-9f9c5d3a6ee3
status: experimental
description: 7-Zip through 21.07 on Windows allows privilege escalation (CVE-2022-29072) and command execution when a file with the .7z extension is dragged to the Help>Contents area. This is caused by misconfiguration of 7z.dll and a heap overflow. The command runs in a child process under the 7zFM.exe process.
references:
    - https://github.com/kagancapar/CVE-2022-29072
    - https://twitter.com/kagancapar/status/1515219358234161153
author: frack113
date: 2022/04/17
modified: 2022/04/19
tags:
    - cve.2022.29072
logsource:
    product: windows
    category: process_creation
detection:
    selection: 
        Image|endswith: '\cmd.exe'
        ParentImage|endswith: '\7zFM.exe'
    filter_bat:
        CommandLine|contains: ' /c '
    filter_null:
        CommandLine: null    
    condition: selection and not 1 of filter_*
falsepositives:
    - Unknown
level: high
