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DllToShellCode/ShellCode_Main/shellcode_base.c at master · 383113122/DllToShellCode · GitHub
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ShellCode_Main
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shellcode_base.c
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ShellCode_Main
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shellcode_base.c
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#include
"shellcode_base.h"
#define
cast
(
t
,
a
) ((t)(a))
#define
cast_offset
(
t
,
p
,
o
) ((t)((uint8_t *)(p) + (o)))
uint32_t
get_delta
() {
uint32_t
r
=
0
;
#ifndef
_WIN64
__asm {
call
delta
;
delta
:
pop
eax
;
sub
eax
,
offset
delta
;
mov
r
,
eax
}
#endif
return
r
;
}
HMODULE
get_kernel32_base
() {
UINT_PTR
ret
;
#ifdef
_WIN64
ret
=
__readgsqword
(
0x60
);
ret
=
*
(
UINT_PTR
*
)(
ret
+
0x18
);
ret
=
*
(
UINT_PTR
*
)(
ret
+
0x30
);
ret
=
*
(
UINT_PTR
*
)
ret
;
ret
=
*
(
UINT_PTR
*
)
ret
;
ret
=
*
(
UINT_PTR
*
)(
ret
+
0x10
);
#else
ret
=
__readfsdword
(
0x30
);
ret
=
*
(
UINT_PTR
*
)(
ret
+
0x0C
);
ret
=
*
(
UINT_PTR
*
)(
ret
+
0x14
);
ret
=
*
(
UINT_PTR
*
)
ret
;
ret
=
*
(
UINT_PTR
*
)
ret
;
ret
=
*
(
UINT_PTR
*
)(
ret
+
0x10
);
#endif
return
(
HMODULE
)
ret
;
};
// BKDRHash
uint32_t
calc_hash
(
char
*
str
) {
uint32_t
seed
=
131
;
// 31 131 1313 13131 131313 etc..
uint32_t
hash
=
0
;
while
(
*
str
) {
hash
=
hash
*
seed
+
(
*
str
++
);
}
return
(
hash
&
0x7FFFFFFF
);
}
void
*
get_proc_address_from_hash
(
HMODULE
module
,
uint32_t
func_hash
,
_GetProcAddress
get_proc_address
) {
PIMAGE_DOS_HEADER
dosh
=
cast
(
PIMAGE_DOS_HEADER
,
module
);
PIMAGE_NT_HEADERS
nth
=
cast_offset
(
PIMAGE_NT_HEADERS
,
module
,
dosh
->
e_lfanew
);
PIMAGE_DATA_DIRECTORY
dataDict
=
&
nth
->
OptionalHeader
.
DataDirectory
[
IMAGE_DIRECTORY_ENTRY_EXPORT
];
if
(
dataDict
->
VirtualAddress
==
0
||
dataDict
->
Size
==
0
)
return
0
;
PIMAGE_EXPORT_DIRECTORY
exportDict
=
cast_offset
(
PIMAGE_EXPORT_DIRECTORY
,
module
,
dataDict
->
VirtualAddress
);
if
(
exportDict
->
NumberOfNames
==
0
)
return
0
;
uint32_t
*
fn
=
cast_offset
(
uint32_t
*
,
module
,
exportDict
->
AddressOfNames
);
uint32_t
*
fa
=
cast_offset
(
uint32_t
*
,
module
,
exportDict
->
AddressOfFunctions
);
uint16_t
*
ord
=
cast_offset
(
uint16_t
*
,
module
,
exportDict
->
AddressOfNameOrdinals
);
for
(
uint32_t
i
=
0
;
i
<
exportDict
->
NumberOfNames
;
i
++
) {
char
*
name
=
cast_offset
(
char
*
,
module
,
fn
[
i
]);
if
(
calc_hash
(
name
)
!=
func_hash
)
continue
;
return
get_proc_address
==
0
?
cast_offset
(
void
*
,
module
,
fa
[
ord
[
i
]]) :
get_proc_address
(
module
,
name
);
}
return
0
;
}
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