There’s a .NET info-stealer making the rounds. It’s called Jupyter, and it’s very good at avoiding end-point protection software.
Originally discovered in November of 2020, Jupyter (originally called Solarmaker) is designed to steal browsing data and login credentials from Google Chrome, Chromium, and Mozilla Firefox.
Jupyter has fairly robust back door capabilities to help it do its dirty work.
It specifically uses a PDF application called Nitro Pro to hide its installer payload and avoid anti-malware software. The process is further hidden behind a third-party packaging wizard called Advanced Installer.
By using the legitimate binary of Nitro Pro 13, and in two legitimately signed certificates (apparently stolen from a company in Poland) Jupyter installs its nefarious .NET module.
You can read more about Jupyter over at Morphisec’s blog (https://blog.morphisec.com/new-jupyter-evasive-delivery-through-msi-installer). It’s pretty interesting and includes a lot more technical information.
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