Beware: Fake Microsoft Office Add-ins on SourceForge Spread Malware to Steal Cryptocurrency

TL;DR

Threat actors are using SourceForge to spread fake Microsoft Office add-ins that install malware to mine and steal cryptocurrency. This article provides essential details on the threat and how to stay protected.

Fake Microsoft Office Add-ins on SourceForge Push Malware to Steal Cryptocurrency

Emerging Threat on SourceForge

Cybersecurity experts have uncovered a new scheme where threat actors are exploiting SourceForge to distribute fake Microsoft Office add-ins. These malicious add-ins are designed to install malware on victims’ computers, with the primary goal of mining and stealing cryptocurrency. This sophisticated attack underscores the growing trend of cybercriminals leveraging legitimate platforms to spread malware¹.

How the Attack Works

1. Distribution: The fake add-ins are hosted on SourceForge, a reputable platform for open-source software. Unsuspecting users download these add-ins, believing them to be genuine tools for enhancing Microsoft Office functionality.
2. Installation: Once downloaded, the add-ins install malware on the victim’s computer. This malware is designed to operate stealthily, avoiding detection by traditional antivirus software.
3. Cryptocurrency Theft: The installed malware then begins mining cryptocurrency using the victim’s computational resources. Additionally, it attempts to steal any cryptocurrency stored on the compromised system.

Impact and Implications

The impact of this attack is significant:

• Financial Loss: Victims may suffer financial losses due to cryptocurrency theft and increased electricity bills from unauthorized mining activities.
• System Performance: The malware can severely degrade system performance, leading to slower computers and potential hardware damage.
• Data Security: There is a risk of further data breaches, as the malware may also be designed to exfiltrate sensitive information.

Protecting Yourself

To safeguard against this threat, users are advised to:

• Verify Sources: Only download add-ins and software from official and trusted sources.
• Update Security Software: Ensure that your antivirus and anti-malware software are up-to-date.
• Monitor System Performance: Keep an eye on your computer’s performance and investigate any unusual slowdowns.

Conclusion

The use of SourceForge to distribute malicious Microsoft Office add-ins highlights the evolving tactics of cybercriminals. Staying informed and vigilant is crucial in protecting against such threats. As the cybersecurity landscape continues to evolve, it is essential to adopt robust security measures to safeguard both personal and organizational data.

Additional Resources

For further insights, check:

• BleepingComputer Article

References

1. (2025-04-08). “Fake Microsoft Office add-in tools push malware via SourceForge”. BleepingComputer. Retrieved 2025-04-08. ↩︎