What type of threats does Zscaler's antivirus signatures primarily identify?

Zscaler's antivirus signatures primarily identify binary payloads through the use of MD5 hashes. This approach focuses on recognizing known malicious files by comparing their unique hash values against a database of threats. When a binary payload is identified, the system can quickly determine if it matches a known malicious signature, ensuring that the file is flagged and potentially blocked before it can cause harm.

The emphasis on using MD5 hashes is crucial in the field of cybersecurity, as it allows for a rapid and efficient way to verify the integrity and origin of files. This method is particularly effective against malware since binary files can be distinctively identified based on their hashed values, streamlining the detection process.

The other options, while related to cybersecurity, do not accurately reflect the primary function of Zscaler's antivirus signatures. Identifying executable files being downloaded pertains to a broader range of file types than just binary payloads; fake antivirus alerts refer to social engineering tactics, and spam emails are typically handled by different layers of security focused on email filtering rather than by antivirus signatures.