Created the Monday 18 March 2019. Updated 1 month, 2 weeks ago.
Base64 is a simple encoding scheme that is often used by malware to represent binary data in an ASCII string. This allows the malware to encode and transmit binary data, such as a payload or network traffic, in a way that is more compact and easier to transmit over text-based communication channels.
Base64 uses a 64-character alphabet to encode the data, which includes the upper and lower case letters, the digits 0-9, and the symbols "+" and "/". The encoded data is typically padded with the character "=" to ensure that it has a length that is a multiple of 4. The encoded data can then be decoded using the same 64-character alphabet to recover the original binary data. This makes Base64 a useful tool for malware to conceal their payloads and communicate with their command and control (C2) servers.
The resources provided below are associated links that will give you even more detailed information and research on current evasion technique. It is important to note that, while these resources may be helpful, it is important to exercise caution when following external links. As always, be careful when clicking on links from unknown sources, as they may lead to malicious content.