Active Nitrogen campaign delivered via malicious ads for PuTTY, FileZilla

In the past couple of weeks, we have observed an ongoing campaign targeting system administrators with fraudulent ads for popular system utilities. The malicious ads are displayed as sponsored results on Google’s search engine page and localized to North America.

Victims are tricked into downloading and running the Nitrogen malware masquerading as a PuTTY or FileZilla installer. Nitrogen is used by threat actors to gain initial access to private networks, followed by data theft and the deployment of ransomware such …

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