dledda-r7
77 lines
2.6 KiB
Ruby
77 lines
2.6 KiB
Ruby
# -*- coding: binary -*-
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module Msf
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###
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#
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# Implements arbitrary exit routines for Windows ARCH_X86 payloads
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#
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###
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module Payload::Windows::Exitfunk
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def asm_exitfunk(opts={})
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asm = "exitfunk:\n"
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case opts[:exitfunk]
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when 'seh'
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asm << %Q^
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mov ebx, #{block_api_hash('kernel32.dll', 'SetUnhandledExceptionFilter')}
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push.i8 0 ; push the exit function parameter
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push ebx ; push the hash of the exit function
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call ebp ; SetUnhandledExceptionFilter(0)
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push.i8 0
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ret ; Return to NULL (crash)
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^
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# On Windows Vista, Server 2008, and newer, it is not possible to call ExitThread
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# on WoW64 processes, instead we need to call RtlExitUserThread. This stub will
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# automatically generate the right code depending on the selected exit method.
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when 'thread'
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asm << %Q^
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mov ebx, #{block_api_hash('kernel32.dll', 'ExitThread')}
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push #{block_api_hash("kernel32.dll", "GetVersion")} ; hash( "kernel32.dll", "GetVersion" )
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call ebp ; GetVersion(); (AL will = major version and AH will = minor version)
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cmp al, 6 ; If we are not running on Windows Vista, 2008 or 7
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jl exitfunk_goodbye ; Then just call the exit function...
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cmp bl, 0xE0 ; If we are trying a call to kernel32.dll!ExitThread on Windows Vista, 2008 or 7...
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jne exitfunk_goodbye ;
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mov ebx, #{block_api_hash("ntdll.dll", "RtlExitUserThread")} ; Then we substitute the EXITFUNK to that of ntdll.dll!RtlExitUserThread
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exitfunk_goodbye: ; We now perform the actual call to the exit function
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push.i8 0 ; push the exit function parameter
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push ebx ; push the hash of the exit function
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call ebp ; call ExitThread(0) || RtlExitUserThread(0)
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^
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when 'process', nil
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asm << %Q^
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mov ebx, #{block_api_hash('kernel32.dll', 'ExitProcess')}
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push.i8 0 ; push the exit function parameter
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push ebx ; push the hash of the exit function
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call ebp ; ExitProcess(0)
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^
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when 'sleep'
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asm << %Q^
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mov ebx, #{block_api_hash('kernel32.dll', 'Sleep')}
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push 300000 ; 300 seconds
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push ebx ; push the hash of the function
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call ebp ; Sleep(300000)
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jmp exitfunk ; repeat
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^
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else
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# Do nothing and continue after the end of the shellcode
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end
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asm
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end
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end
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end
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