"Byer-Nichols Threat Brief for December 1-15 2025," a cybersecurity intelligence report detailing threat activity over a two-week period. The brief, written by Jeremy Nichols, focuses on key trends like the re-emergence of the LockBit ransomware group and the dominance of the React2Shell vulnerability across multiple threat actors. Data tables illustrate shifts in ransomware leadership, with Qilin maintaining the top spot and Coinbase Cartel driving the construction sector to the most targeted position, while the USA remains the primary victim location. The document also lists specific trending adversaries (UNC clusters), actively exploited CVEs across major vendors, and new types of malware, all contributing to a clear picture of the current threat landscape.