Adversaries may transfer tools or other files from one system to another to stage adversary tools or other files over the course of an operation.  Copying of files may also be performed laterally between internal victim systems to support Lateral Movement with remote Execution using inherent file sharing protocols such as file sharing over SMB to connected network shares. 
In control systems environments, malware may use SMB and other file sharing protocols to move laterally through industrial networks.
Sandworm Team used a VBS script to facilitate lateral tool transfer. The VBS script was used to copy ICS-specific payloads with the following command: cscript C:\Backinfo\ufn.vbs C:\Backinfo\101.dll C:\Delta\101.dll 
Stuxnet sends an SQL statement that creates a table and inserts a binary value into the table. The binary value is a hex string representation of the main Stuxnet DLL as an executable file (formed using resource 210) and an updated configuration data block. 
|M0931||Network Intrusion Prevention||
Network intrusion detection and prevention systems that use network signatures to identify traffic for specific adversary malware or unusual data transfer over known tools and protocols like FTP can be used to mitigate activity at the network level. Signatures are often for unique indicators within protocols and may be based on the specific obfuscation technique used by a particular adversary or tool and will likely be different across various malware families and versions. Adversaries will likely change tool C2 signatures over time or construct protocols in such a way as to avoid detection by common defensive tools. 
|ID||Data Source||Data Component||Detects|
Monitor executed commands and arguments for abnormal usage of utilities and command-line arguments that may be used in support of remote transfer of files.
Monitor for file creation in conjunction with other techniques (e.g., file transfers using Remote Services).
Monitor for alike file hashes or characteristics (ex: filename) that are created on multiple hosts.
|DS0033||Network Share||Network Share Access||
Monitor for unexpected network share access, such as files transferred between shares within a network using protocols such as Server Message Block (SMB).
|DS0029||Network Traffic||Network Traffic Content||
Monitor for unusual processes with internal network connections creating files on-system which may be suspicious.
|Network Traffic Flow||
Monitor for network traffic originating from unknown/unexpected hosts. Local network traffic metadata (such as source MAC addressing) as well as usage of network management protocols such as DHCP may be helpful in identifying hardware.
Monitor newly constructed processes that assist in lateral tool transfers, such as file transfer programs.