Ransomware is a type of malware that encrypts a victim's files and demands payment in exchange for the decryption key.
However, some ransomware strains also have the ability to exfiltrate data from the victim's computer before encrypting it. This means that the attacker can steal sensitive information and threaten to release it publicly if the ransom is not paid.
There are several ways that ransomware can exfiltrate data. One common method is through the use of command and control (C&C) servers. These servers act as a communication channel between the attacker and the infected computer. Once the ransomware infects a computer, it establishes a connection with the C&C server, which allows the attacker to remotely control the infected computer and exfiltrate data.
Another method is through the use of keyloggers. Keyloggers are programs that record every keystroke made on a computer, including passwords and other sensitive information. Ransomware strains that use keyloggers can capture login credentials and other sensitive data and send it back to the attacker.
Finally, some ransomware strains use file transfer protocols (FTP) to exfiltrate data. FTP is a standard network protocol used to transfer files from one host to another over the internet. Ransomware strains that use FTP can upload stolen data to a remote server controlled by the attacker.
To protect against ransomware exfiltration, it is important to have a robust backup strategy in place. Regularly backing up important data to an external hard drive or cloud storage service can help mitigate the impact of a ransomware attack. Additionally, it is important to keep software and operating systems up to date and to use antivirus software to detect and prevent ransomware infections.