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I have a VBScript (.vbs) file that is a malware dropper. It executes correctly in a commercial malware sandbox. but does not act the same in my manual analysis lab, and I need to figure out why. The script is heavily obfuscated (i.e. not simply using execute), and I don't know how to begin to analyze it.

So far, i've tried the open source tool ViperMonkey, put it failed to trace the script.

Any suggestions?

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  • You can share the sample? Thank you
    – incode
    Sep 23 '20 at 17:32
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Try running the following from the command line:

cscript /x .\malwaresample.vbs

That should open it up in Visual Studios and allow you to step through it.

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  • Unfortunately, I don't have Visual Studio :(
    – Sean W.
    Sep 20 '20 at 15:08

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