You have been tracking several underground forums, mostly brazilian, during an investigation regarding brazilian banking trojans used to intercept credentials to online banking sites in order to perform unauthorized wire transfers to cyber-crook accounts.
Using Google translator (your Portuguese is not that good yet) you have identified a crook that on during the last month was bragging about how he had developed a new trojan, screenshots of VirusTotal followed in his post, he had used the public web interface to benchmark his creation.
Using VirusTotal Intelligence, can you tell me the hash of a file that could be the crook's malware?
It is always good to take a close look at the documentation, there are certain search modifiers that will allow you to focus on file candidates that could match the described criteria.
This modifier allows you to search for samples according to the ISO 3166-1-alpha-2 of the country of the first submitter. It also allows you to filter according to the submission interface used: web, api, email, etc.
The fs modifier allows you to focus on samples first submitted within a given time range.
We want to look for files uploaded from Brazil, sent through the web interface during the last month. Any of the hits returned by the following search will solve the challenge:
first_submitter:BR first_submitter:web fs:2024-03-20+ fs:2024-04-20-