Billbug is a group of advanced persistent threat (APT) hackers that has been active since at least 2014. The group is believed to be based in China and has been linked to several high-profile cyber attacks, including the 2017 Marriott hack and the 2018 Delta Air Lines breach.
The group is known for using a variety of tactics and techniques to compromise targets, including spearphishing, malware, and exploitation of vulnerabilities in software and hardware. Billbug has been observed targeting a wide range of industries, including defense, aerospace, telecommunications, and finance.
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