CVE-2023-38331 Exploitation Attempt - Suspicious WinRAR Child Process

 1title: CVE-2023-38331 Exploitation Attempt - Suspicious WinRAR Child Process
 2id: ec3a3c2f-9bb0-4a9b-8f4b-5ec386544343
 3related:
 4    - id: e4556676-fc5c-4e95-8c39-5ef27791541f
 5      type: similar
 6status: experimental
 7description: Detects exploitation attempt of CVE-2023-38331 (WinRAR before v6.23), where an attacker can leverage WinRAR to execute arbitrary commands and binaries.
 8references:
 9    - https://www.group-ib.com/blog/cve-2023-38831-winrar-zero-day/
10    - https://github.com/knight0x07/WinRAR-Code-Execution-Vulnerability-CVE-2023-38831/blob/26ab6c40b6d2c09bb4fc60feaa4a3a90cfd20c23/Part-1-Overview.md
11author: Nasreddine Bencherchali (Nextron Systems), Andreas Braathen (mnemonic.io)
12date: 2023/08/30
13tags:
14    - detection.emerging_threats
15    - attack.execution
16    - attack.t1203
17    - cve.2023.38331
18logsource:
19    category: process_creation
20    product: windows
21detection:
22    selection_parent:
23        ParentImage|endswith: '\WinRAR.exe'
24    selection_folder:
25        CommandLine|contains: '\AppData\Local\Temp\Rar$'
26    selection_double_ext:
27        CommandLine|re: '\.[a-zA-Z0-9]{1,4} \.'
28    selection_binaries:
29        # Note: add additional binaries that the attacker might use
30        - Image|endswith:
31            - '\cmd.exe'
32            - '\wscript.exe'
33        - OriginalFileName:
34            - 'Cmd.Exe'
35            - 'cscript.exe'
36            - 'PowerShell.EXE'
37            - 'pwsh.dll'
38            - 'wscript.exe'
39    condition: all of selection_*
40falsepositives:
41    - Unlikely
42level: high