CVE-2023-38331 Exploitation Attempt - Suspicious WinRAR Child Process
Detects exploitation attempt of CVE-2023-38331 (WinRAR before v6.23), where an attacker can leverage WinRAR to execute arbitrary commands and binaries.
Sigma rule (View on GitHub)
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: test
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
13modified: 2024-01-22
14tags:
15 - detection.emerging-threats
16 - attack.execution
17 - attack.t1203
18 - cve.2023-38331
19logsource:
20 category: process_creation
21 product: windows
22detection:
23 selection_parent:
24 ParentImage|endswith: '\WinRAR.exe'
25 selection_folder:
26 CommandLine|contains: '\AppData\Local\Temp\Rar$'
27 selection_double_ext:
28 CommandLine|re: '\.[a-zA-Z0-9]{1,4} \.'
29 selection_binaries:
30 # Note: add additional binaries that the attacker might use
31 - Image|endswith:
32 - '\cmd.exe'
33 - '\cscript.exe'
34 - '\powershell.exe'
35 - '\pwsh.exe'
36 - '\wscript.exe'
37 - OriginalFileName:
38 - 'Cmd.Exe'
39 - 'cscript.exe'
40 - 'PowerShell.EXE'
41 - 'pwsh.dll'
42 - 'wscript.exe'
43 condition: all of selection_*
44falsepositives:
45 - Unlikely
46level: high
References
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