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46 lines
1.5 KiB
Markdown
46 lines
1.5 KiB
Markdown
## Cobalt Strike UDRL Hasher
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Simple helper utility recomputing `DLL Reflective Loader` hashes, for offensive engineering needs whenever we want to recompile [User Defined Reflective Loaders](https://hstechdocs.helpsystems.com/manuals/cobaltstrike/current/userguide/content/topics/malleable-c2-extend_user-defined-rdll.htm) and such.
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Ever came across [such hashes](https://github.com/stephenfewer/ReflectiveDLLInjection/blob/master/dll/src/ReflectiveLoader.h#L43) before?
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```
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#define KERNEL32DLL_HASH 0x6A4ABC5B
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#define NTDLLDLL_HASH 0x3CFA685D
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#define LOADLIBRARYA_HASH 0xEC0E4E8E
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#define GETPROCADDRESS_HASH 0x7C0DFCAA
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#define VIRTUALALLOC_HASH 0x91AFCA54
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#define NTFLUSHINSTRUCTIONCACHE_HASH 0x534C0AB8
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[...]
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#define HASH_KEY 13
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```
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These can be used for a straightforward signaturing.
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We can regenerate them easily with utility included here:
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```
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cmd> hash 55
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#define KERNEL32DLL_HASH 0xA6154C3A // kernel32.dll
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#define NTDLLDLL_HASH 0x0521447A // ntdll.dll
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#define LOADLIBRARYA_HASH 0xE0D79FEB // LoadLibraryA
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#define GETPROCADDRESS_HASH 0x6BAC2F89 // GetProcAddress
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#define VIRTUALALLOC_HASH 0x9EE2D962 // VirtualAlloc
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#define VIRTUALPROTECT_HASH 0x9154022F // VirtualProtect
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#define NTFLUSHINSTRUCTIONCACHE_HASH 0x7353E65D // NtFlushInstructionCache
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#define HASH_KEY 55
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```
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**Notice** - if you want to get hash for a DLL, be sure to include its extension:
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```
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hash 55 kernel32.dll
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```
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