Analyzing an HTA file
I received an Invoice.MHT file attached to an email:
The URL points to an HTA file:
We can see a PowerShell command with BASE64. This can be dumped with base64dump:
As expected, it is UNICODE:
We can try to decode this as UTF-16:
And we get an error, because of some unprintable characters. These can be seen here:
A trick to deal with such characters, is to decode as UTF-16 and encode as ASCII, but ignore errors, like this:
The downloaded executable is not detected by a lot of anti-virus programs.
Didier Stevens
Microsoft MVP Consumer Security
blog.DidierStevens.com DidierStevensLabs.com
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Anonymous
Dec 3rd 2022
9 months ago
Anonymous
Dec 3rd 2022
9 months ago
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Anonymous
Dec 26th 2022
9 months ago
Anonymous
Dec 26th 2022
9 months ago
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Anonymous
Dec 26th 2022
9 months ago
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Anonymous
Dec 26th 2022
9 months ago
Anonymous
Dec 26th 2022
9 months ago
https://defineprogramming.com/
Dec 26th 2022
9 months ago
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https://clickercounter.org/
https://defineprogramming.com/
Dec 26th 2022
9 months ago
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Jan 2nd 2023
8 months ago