WeaselBiscuit Stealer Spreads via 13 npm Packages to Harvest Chrome Extension Storage

WeaselBiscuit Stealer Spreads via 13 npm Packages to Harvest Chrome Extension Storage Ravie LakshmananSep 18, 2026Malware / Web Security Cybersecurity researchers have discovered a cluster of 13 npm packages that have been found to deliver a previously undocumented JavaScript stealer codenamed WeaselBiscuit. The new malware family, per OpenSourceMalware, exhibits functional overlaps with two malware strains associated with the Democratic People's Republic of Korea's (DPRK) Contagious Interview campaign: BeaverTail and OtterCookie. "It's smaller, lighter, and stripped down, with many of the heavier functions removed entirely," security researcher Paul McCarty (aka 6mile) said. The names of the packages are below – @biz44/id10-client @biz44/id12-client @biz44/id44-client @biz44/id79-client @biz44/id95-client @biz44/id99-client @biz44/process-runtime-utils @biz44/runtime-utils engin1 id79-client process-lhpm process-mite process-tailwind "It's a stripped down stealer that borrows several…