There are a couple of manner ins which wrongdoers can acquire zero-day malware:
1. They can buy it on the black market.
2. They can create it themselves.
3. They can steal it from a legitimate business or individual.
4. They can discover it in the wild.
The most common way that bad guys acquire zero-day malware is by purchasing it on the black market. There are a variety of black markets that offer zero-day malware, and the prices can differ depending on the demand and the sophistication of the malware.
Wrongdoers can likewise develop zero-day malware themselves, although this is less common. https://romanquarterconsultation.co.uk/?p=1284 In order to do this, they would need to have a great understanding of computer system security and exploits.
Another way that wrongdoers can get zero-day malware is by taking it from a legitimate business or person. This can be done by hacking into a company's network and stealing the malware, or by social engineering a business or person into providing the malware.
Wrongdoers can discover zero-day malware in the wild. This normally happens when a security scientist finds a brand-new vulnerability and writes a make use of for it. The researcher may then offer the make use of to a criminal group, or the make use of may be leaked online.