Evasive QBot Malware Uses Short-lived Residential IP Addresses for Dynamic Attacks

An analysis of the evasive and tenacious malware known as QBot has revealed that 25% of its command-and-control servers are only active for a day and 50% of them don’t remain active for more than a week.

The malware arrives on victims’ devices via spearphishing emails that either directly incorporate lure files or contain embedded URLs that lead to decoy documents.

While phishing waves bearing QBot at the start of 2023 leveraged Microsoft OneNote as an intrusion vector, recent attacks have employed protected PDF files to install the malware on victim machines.

While it may not rely on sheer numbers like Emotet, it demonstrates technical craft by varying initial access methods and maintaining a resilient yet evasive residential C2 architecture, the authors note.

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