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Generate a Yara rule to find base64-encoded files containg a specific keyword
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Often malware analysts require to search through base64-encoded samples with a search term such as Application.Run. base64_substring helps them by enumerating all possible base64 encoding for a given search term and generating a yara rule that checks those possiblities.

How to Run

Example: generating a yara rule that matches base64-encoded file containing Application term.

> python
> Please enter a rule name
> Please enter a text

Further Reading

"Searching for Content in Base-64 Strings" by Lee Holmes

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