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Over the past year, the delivery of Lua malware appears to have undergone simplification, possibly to reduce exposure to detection mechanisms. The malware is frequently delivered using obfuscated Lua scripts instead of compiled Lua bytecode, as the latter can trigger suspicion more easily.
Chalubo is a commodity remote access trojan (RAT). First identified in 2018, employed savvy tradecraft to obfuscate its activity; it removed all files from disk to run in-memory, assumed a random process name already present on the device, and encrypted all communications with the command and contr…