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shell_text.S
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shell_text.S
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/*
* CreateRemoteThread for Linux
*
* Copyright (c) 2018, ilammy
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* version 2 as published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public
* License along with this program; if not, write to the Free
* Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
* Boston, MA 02110-1301 USA.
*/
.section .rodata
.global shellcode_start
.global shellcode_address_dlopen
.global shellcode_address_dlsym
.global shellcode_address_pthread_create
.global shellcode_address_pthread_detach
.global shellcode_address_payload
.global shellcode_address_entry
.global shellcode_end
.set __NR_exit, 60
.set RTLD_LAZY, 1
.align 8
shellcode_start:
/*
* void *payload; // %rax
*
* payload = dlopen(shellcode_address_payload, RTLD_LAZY);
*/
lea shellcode_address_payload(%rip),%rdi
mov $RTLD_LAZY,%rsi
mov shellcode_address_dlopen(%rip),%rax
callq *%rax
/*
* if (!payload) exit(1);
*/
test %rax,%rax
jz .Lerror_dlopen
/*
* void (*entry)(void); // %rax
*
* entry = dlsym(payload, shellcode_address_entry);
*/
mov %rax,%rdi
lea shellcode_address_entry(%rip),%rsi
mov shellcode_address_dlsym(%rip),%rax
callq *%rax
/*
* if (!entry) exit(2);
*/
test %rax,%rax
jz .Lerror_dlsym
/*
* int err; // %rax
* pthread_t thread; // 0(%rbp)
*
* err = pthread_create(&thread, NULL, entry, NULL);
*/
sub $16,%rsp
mov %rsp,%rdi
xor %rsi,%rsi
mov %rax,%rdx
xor %rcx,%rcx
mov shellcode_address_pthread_create(%rip),%rax
callq *%rax
/*
* if (err) exit(3);
*/
test %rax,%rax
jnz .Lerror_pthread_create
/*
* err = pthread_detach(thread);
*/
mov (%rsp),%rdi
add $16,%rsp
mov shellcode_address_pthread_detach(%rip),%rax
callq *%rax
/*
* if (err) exit(4);
*/
test %rax,%rax
jnz .Lerror_pthread_detach
/*
* exit(0);
*/
xor %rdi,%rdi
.Lout:
mov $__NR_exit,%rax
syscall
.Lerror_dlopen:
mov $1,%rdi
jmp .Lout
.Lerror_dlsym:
mov $2,%rdi
jmp .Lout
.Lerror_pthread_create:
mov $3,%rdi
jmp .Lout
.Lerror_pthread_detach:
mov $4,%rdi
jmp .Lout
.align 8
shellcode_address_dlopen:
.space 8
shellcode_address_dlsym:
.space 8
shellcode_address_pthread_create:
.space 8
shellcode_address_pthread_detach:
.space 8
shellcode_address_payload:
.space 256
shellcode_address_entry:
.space 256
shellcode_end:
.end