Tofsee is distributed via various methods. It might be attached to a phishing email, delivered by an exploit kit, bundled with other programs, or downloaded from a malicious site.
Once executed on an infected computer, the malware copies itself to various directories to make it more difficult to remediate the infection. Additionally, the malware will modify the Windows Registry to ensure that it is automatically executed when the system starts, providing persistence across system reboots.
The core functions of Tofsee are to collect information about the user and to use their computer to send spam emails. However, the malware operator can also send other modules to the malware with various capabilities.
Tofsee malware is a trojan whose primary purpose is to send spam emails. Once installed on a computer, the malware will change settings in the browser and DNS configuration as well as collect and exfiltrate information about the user, including tracking their activities on the Internet.
Beyond these core capabilities, Tofsee is also modular malware, meaning that the malware can download and execute additional malicious functionality on an infected computer. Some of the most commonly used Tofsee modules have the following functions:
The modularity of the Tofsee malware means that its capabilities can change at any time. Malware developers can create and deploy additional modules or modify the functionality of existing ones.
The primary impacts of a Tofsee infection are that a computer is used to send spam email and that information about the user and their web browsing activities may be collected and sent to the attacker. This information could be used in follow-up attacks or for blackmail purposes.
The modular nature of Tofsee means that it can have other impacts both on an infected system and other computers. For example, if an infected computer is used by a DDoS or cryptomining botnet, then its network bandwidth or computational resources are being used for the attacker’s benefit. This also affects other parties due to the impacts of the DDoS attack on its victims and the attacker’s earning of rewards for mining cryptocurrency.
Tofsee malware uses various methods to infect a computer and can be used for numerous malicious purposes. Some security best practices that can help to protect against Tofsee infections include:
Tofsee is a powerful, modular trojan that offers a wide range of malicious capabilities. However, it is only one of several cyber threats that organizations face. Learn more about the leading cyber threats to the business in Check Point’s 2022 Cyber Security Report.
Check Point Harmony Endpoint provides comprehensive protection against Tofsee and other malware variants, including robust zero day protection. Learn more about how Harmony Endpoint can protect your organization’s systems by signing up for a free demo today.