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Another file transfer protocol that is built directly into the mainframe is IND$File which only requires a typical TN3270 connection and compromised credentials to simply download any file they are able to access.The next tool designed to transfer files is the Network File Share (NFS) which is a distributed file system found in Linux that enables a hacker to “mount” the filesystem and download any files off the mainframe.FTP also makes it easy to upload/download files in bulk and can even be used in Job Entry System (JES) mode to execute commands on the mainframe. If SSH isn’t available, hackers could also use the File Transfer Protocol (FTP) to easily download any files they are authorized to access on the system.Since the primary method of initial access to most machines is compromised account credentials, hackers could simply use those credentials with Secure Copy (SCP) to copy the files over the Secure Shell (SSH) protocol. Hackers are going to use native tools available on the system before getting to more complex methods – especially if those tools are also ubiquitous on Windows/Linux where most will be more familiar.Do I have alerts built for Indicators of Compromise (IOC) for each of these activities?.

My goal is to help you have an answer to the following questions:

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This knowledge is critical in order to understand how to initially protect your system and effectively detect anomalous and malicious activity in time to respond to the breach. This blog will focus on the top ways hackers will exfiltrate the sensitive data from your mainframe.

While ransomware has created a scenario where hackers no longer need to exfiltrate data to profit off their cybercrime, theft of sensitive data is still a catastrophic risk to companies who face increasingly punitive fines and loss of customer trust.

Once a threat actor completely owns the mainframe, they will have complete access to the sensitive data that resides on it.

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In previous blogs I have already illustrated the various ways hackers will gain initial access to your mainframe and how they will execute a privilege escalation attack to gain full control over the system.