C2 via FTP(S)

Created the Monday 12 June 2023. Updated 9 months, 2 weeks ago.

C2 via FTP is a technique that utilizes the File Transfer Protocol (FTP) to establish command and control communication between an attacker and victim systems. It involves sending commands and receiving responses within FTP sessions, effectively using FTP as a conduit for covert communication.

To implement C2 via FTP, an attacker needs control over an FTP server, and must establish a connection to a compromised system that has access to an external network. The victim’s system must be capable of initiating FTP sessions with the attacker's server. Additionally, the attacker could employ various means of obfuscation to make the traffic appear innocuous and blend in with legitimate FTP traffic.

C2 via FTP can serve diverse objectives, such as remotely executing commands, managing malware, or orchestrating multistage attacks. Detecting C2 via FTP can be challenging, as FTP is a widely-used protocol for legitimate file transfers, and the malicious traffic may not raise alarms in a network’s security monitoring systems. Moreover, if FTPS (FTP Secure) is used, the data is encrypted, adding an additional layer of complexity to detection.

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Featured Windows API's

Below, you will find a list of the most commonly used Windows API's that are currently utilized by malware authors for current evasion technique. This list is meant to provide an overview of the API's that are commonly used for this purpose. If there are any API's that you feel should be included on this list, please do not hesitate to contact us. We will be happy to update the list and provide any additional information or documentation that may be helpful.

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Additional Resources

External Links

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.

Sleeping Alien

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