Remote File Copy
|Remote File Copy|
|Tactic||Command and Control, Lateral Movement|
|Platform||Linux, macOS, Windows|
|Data Sources||File monitoring, Packet capture, Process use of network, Netflow/Enclave netflow, Network protocol analysis, Process monitoring|
Files may be copied from one system to another to stage adversary tools or other files over the course of an operation. Files may be copied from an external adversary-controlled system through the Command and Control channel to bring tools into the victim network or through alternate protocols with another tool such as FTP. Files can also be copied over on Mac and Linux with native tools like scp, rsync, and sftp.
Adversaries may also copy files 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 or with authenticated connections with Windows Admin Shares or Remote Desktop Protocol.
- After security appliances blocked one version of the ADVSTORESHELL implant, APT28 actors compiled and delivered another ADVSTORESHELL x64 backdoor.1 APT28 also used a first-stage downloader to contact the C2 server to obtain the second-stage implant.2
- APT3 has a tool that can copy files to remote machines.3
- APT34 can download remote files onto victims.5
- BRONZE BUTLER has used various tools to download files, including DGet (a similar tool to wget).6
- Dragonfly downloaded tools from a remote server after they were inside the victim network.7
- FIN10 has deployed Meterpreter stagers and SplinterRAT instances in the victim network after moving laterally.8
- FIN7 uses a PowerShell script to launch shellcode that retrieves an additional payload.9
- Tools used by Gamaredon Group are capable of downloading and executing additional payloads.10
- Several Lazarus Group malware families are capable of downloading and executing binaries from its C2 server.1112
- Magic Hound has downloaded additional code and files from servers onto victims.13
- A Patchwork payload downloads additional malware from the C2 server.14
- After re-establishing access to a victim network, Threat Group-3390 actors download tools including gsecdump and WCE that are staged temporarily on websites that were previously compromised but never used.15
- menuPass has installed updates and new malware on victims.16
- Agent.btz attempts to download an encrypted binary from a specified domain.17
- BADNEWS is capable of downloading additional files through C2 channels, including a new version of itself.18
- CHOPSTICK is capable of performing remote file transmission.19
- CORESHELL downloads another dropper from its C2 server.20
- CallMe has the capability to download a file to the victim from the C2 server.21
- ChChes is capable of downloading files, including additional modules.222324
- CloudDuke downloads and executes additional malware from either a Web address or a Microsoft OneDrive account.25
- Crimson contains a command to retrieve files from its C2 server.26
- Daserf can download remote files.276
- After downloading its main config file, Downdelph downloads multiple payloads from C2 servers.28
- DustySky searches for network drives and removable media and duplicates itself onto them.29
- Emissary has the capability to download files from the C2 server.30
- Felismus can download files from remote servers.31
- Gazer can execute a task to download a file.3233
- H1N1 contains a command to download and execute a file from a remotely hosted URL using WinINet HTTP requests.34
- HTTPBrowser is capable of writing a file to the compromised system from the C2 server.15
- Helminth can download additional files.35
- Hi-Zor has the ability to upload and download files from its C2 server.36
- JHUHUGIT retrieves and executes an additional payload from its C2 server.37
- Kasidet has the ability to download and execute additional files.38
- LOWBALL uses the Dropbox API to request two files, one of which is the same file as the one dropped by the malicious email attachment. This is most likely meant to be a mechanism to update the compromised host with a new version of the LOWBALL malware.39
- MiniDuke can download additional encrypted backdoors onto the victim via GIF files.40
- Misdat is capable of downloading files from the C2.41
- Mivast has the capability to download and execute .exe files.42
- MobileOrder has a command to download a file from the C2 server to the victim mobile device's SD card.21
- Nidiran can download and execute files.43
- POSHSPY downloads and executes additional PowerShell code and Windows binaries.44
- POWERSOURCE has been observed being used to download TEXTMATE and the Cobalt Strike Beacon payload onto victims.45
- POWRUNER can download or upload files from its C2 server.5
- Pisloader has a command to upload a file to the victim machine.46
- PowerDuke has a command to download a file.47
- Psylo has a command to download a file to the system from its C2 server.21
- Pteranodon can download and execute additional files.10
- RARSTONE downloads its backdoor component from a C2 server and loads it directly into memory.48
- RTM can download additional files.49
- RedLeaves is capable of downloading a file from a specified URL.50
- ... further results
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.51
Monitor for file creation and files transferred within a network over SMB. Unusual processes with external network connections creating files on-system may be suspicious. Use of utilities, such as FTP, that does not normally occur may also be suspicious.
Analyze network data for uncommon data flows (e.g., a client sending significantly more data than it receives from a server). Processes utilizing the network that do not normally have network communication or have never been seen before are suspicious. Analyze packet contents to detect communications that do not follow the expected protocol behavior for the port that is being used.51
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