BokuLoader is a User-Defined Reflective Loader (UDRL) designed to enhance the evasion capabilities of Cobalt Strike, a popular penetration testing and red-teaming tool.
Created as a proof-of-concept, BokuLoader aims to recreate and improve upon the evasion features of Cobalt Strike’s built-in reflective loader while supporting red teams in developing their own custom UDRLs. Below is an overview of its functions and features.
ntdll.dll
. This is particularly useful for memory protection changes (e.g., NtProtectVirtualMemory
).Kernel32.LoadLibraryA
or Kernel32.GetProcAddress
.HeapAlloc
, VirtualAlloc
, etc.) and implements header-less beacon DLLs by nullifying the first 0x1000 bytes of the virtual beacon DLL.To use BokuLoader effectively:
BokuLoader incorporates several advanced techniques to evade detection:
However, detection methods like scanning process memory or monitoring system calls may still identify its activities. BokuLoader is a sophisticated tool for enhancing Cobalt Strike’s evasion capabilities.
While it provides powerful features for red teams, it requires careful implementation and testing to ensure effectiveness in real-world scenarios.
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