Chapter 13: Data Exfiltration

1. Yes, there are alternative methods such as FTP, SSH, Gmail, Twitter, and so on. A lot of tools and PoC codes can be found on the internet for exfiltration of data. And, it's not totally undetectable, these techniques help you avoid detection to a certain level, but we should consider the fact that Blue team may also know about these tools and might be monitoring tool-specific channels for any activity.
2. Frequency analysis is one of the known ciphertext attacks. This is based on the study of the frequency of letters or groups of letters in a ciphertext. Frequency analysis is used for breaking substitution ciphers. The general idea is to find the popular letters in the ciphertext and to try to replace them with the common letters in the used language.
3. There are a lot of tools which are released every day for the same purpose, such as the Data Exfiltration...