Function at 0x4b1aa0
Capabilities:
Access peb ldr_data

Disassembly:
push 0xffffffffffffffff
push 0x54a698
mov eax, dword fs:[0]
push eax
mov dword fs:[0], esp
sub esp, 0x18
push edi
mov dword [esp + 4], ecx
lea eax, [esp + 0x30]
lea ecx, [esp + 0xc]
push eax
push ecx
mov dword [esp + 0x2c], 0
call fcn.004a8af0
add esp, 8
lea ecx, [esp + 0xc]
push 1
call fcn.004aed00
mov edi, str.BASE64
or ecx, 0xffffffff
xor eax, eax
mov edx, dword [esp + 0x38]
repne scasb al, byte es:[edi]
not ecx
dec ecx
push ecx
push str.BASE64
push edx
push eax
lea ecx, [esp + 0x40]
call fcn.004aea20
test eax, eax
je 0x4b1b5c
mov edi, str.QUOTED_PRINTABLE
or ecx, 0xffffffff
xor eax, eax
repne scasb al, byte es:[edi]
mov eax, dword [esp + 0x38]
not ecx
dec ecx
push ecx
push str.QUOTED_PRINTABLE
push eax
push 0
lea ecx, [esp + 0x40]
call fcn.004aea20
test eax, eax
je 0x4b1b5c
push 1
lea ecx, [esp + 0x34]
mov dword [esp + 0x28], 0xffffffff
call fcn.004aed00
mov eax, dword [esp + 0x2c]
pop edi
mov ecx, dword [esp + 0x18]
mov dword fs:[0], ecx
add esp, 0x24
ret 0x18
mov ecx, dword [esp + 0x40]
push ebx
push ebp
push ecx
call fcn.005113e7
mov ebx, eax
mov edi, str.BASE64
or ecx, 0xffffffff
xor eax, eax
add esp, 4
mov edx, dword [esp + 0x40]
repne scasb al, byte es:[edi]
not ecx
dec ecx
mov dword [esp + 0x10], ebx
mov ebp, ecx
mov ecx, edx
cmp edx, ebp
jb 0x4b1b8e
mov ecx, ebp
push esi
mov esi, dword [esp + 0x40]
mov edi, str.BASE64
xor eax, eax
repe cmpsb byte [esi], byte es:[edi]
je 0x4b1ba3
sbb eax, eax
sbb eax, 0xffffffff
test eax, eax
jne 0x4b1c5b
cmp edx, ebp
jb 0x4b1c5b
cmp edx, ebp
setne al
test eax, eax
jne 0x4b1c5b
mov eax, dword [esp + 0x4c]
mov esi, ebx
mov ebx, dword [esp + 0x38]
xor ebp, ebp
xor edi, edi
mov ecx, ebx
test eax, eax
jle 0x4b1c4b
mov al, byte [ecx]
cmp al, 0xd
je 0x4b1c43
cmp al, 0xa
je 0x4b1c43
movsx edx, al
movsx eax, byte [edx + 0x626ff0]
movsx edx, byte [ecx + 1]
shl eax, 0x12
inc ecx
movsx edx, byte [edx + 0x626ff0]
shl edx, 0xc
add eax, edx
inc ecx
mov edx, eax
sar edx, 0x10
mov byte [esi], dl
mov dl, byte [ecx]
inc esi
inc edi
cmp dl, 0x3d
je 0x4b1c3e
movsx edx, dl
movsx edx, byte [edx + 0x626ff0]
shl edx, 6
add eax, edx
inc ecx
mov edx, eax
sar edx, 8
mov byte [esi], dl
mov dl, byte [ecx]
inc esi
inc edi
cmp dl, 0x3d
je 0x4b1c3e
movsx edx, dl
movsx edx, byte [edx + 0x626ff0]
add eax, edx
inc ecx
mov byte [esi], al
inc esi
inc edi
add ebp, 4
jmp 0x4b1c45
inc ecx
inc ebp
cmp ebp, dword [esp + 0x4c]
jl 0x4b1bd4
mov eax, dword [esp + 0x10]
mov byte [esi], 0
mov edx, dword [esp + 0x44]
mov dword [eax + 0x18], edi
jmp 0x4b1c5f
mov ebx, dword [esp + 0x38]
mov edi, str.QUOTED_PRINTABLE
or ecx, 0xffffffff
xor eax, eax
repne scasb al, byte es:[edi]
not ecx
dec ecx
mov ebp, ecx
mov ecx, edx
cmp edx, ebp
jb 0x4b1c78
mov ecx, ebp
mov esi, dword [esp + 0x40]
mov edi, str.QUOTED_PRINTABLE
xor eax, eax
repe cmpsb byte [esi], byte es:[edi]
je 0x4b1c8c
sbb eax, eax
sbb eax, 0xffffffff
test eax, eax
jne 0x4b1d0f
cmp edx, ebp
jb 0x4b1d0f
cmp edx, ebp
setne al
test eax, eax
jne 0x4b1d0f
mov eax, dword [esp + 0x4c]
mov edi, dword [esp + 0x14]
mov esi, ebx
xor ebp, ebp
xor ebx, ebx
test eax, eax
jle 0x4b1cff
push 3
push 0x6620ec
push esi
call fcn.0050fd80
add esp, 0xc
test eax, eax
jne 0x4b1ccb
add esi, 3
add ebp, 3
jmp 0x4b1cf9
mov al, byte [esi]
cmp al, 0x3d
jne 0x4b1cf3
cmp byte [esi + 1], 0x3d
je 0x4b1d79
push edi
push str._02X
push esi
call fcn.00511efd
add esp, 0xc
inc edi
add esi, 3
add ebp, 3
jmp 0x4b1cf8
mov byte [edi], al
inc edi
inc esi
inc ebp
inc ebx
cmp ebp, dword [esp + 0x4c]
jl 0x4b1caf
mov byte [edi], 0
mov eax, ebx
mov edx, dword [esp + 0x10]
mov ebx, dword [esp + 0x38]
mov dword [edx + 0x18], eax
mov ecx, dword [esp + 0x4c]
xor eax, eax
mov edx, ecx
mov edi, ebx
shr ecx, 2
rep stosd dword es:[edi], eax
mov ecx, edx
and ecx, 3
rep stosb byte es:[edi], al
mov eax, dword [esp + 0x10]
mov edi, ebx
mov ecx, dword [eax + 0x18]
mov eax, dword [esp + 0x14]
mov edx, ecx
mov esi, eax
shr ecx, 2
rep movsd dword es:[edi], dword [esi]
mov ecx, edx
and ecx, 3
rep movsb byte es:[edi], byte [esi]
test eax, eax
pop esi
je 0x4b1d50
push eax
call fcn.005112fe
add esp, 4
push 1
lea ecx, [esp + 0x3c]
mov dword [esp + 0x30], 0xffffffff
call fcn.004aed00
mov ecx, dword [esp + 0x24]
mov eax, ebx
pop ebp
pop ebx
pop edi
mov dword fs:[0], ecx
add esp, 0x24
ret 0x18
mov esi, dword [esp + 0x4c]
mov ecx, dword [esp + 0x38]
mov edi, dword [esp + 0x14]
push esi
push ecx
push edi
call fcn.00511200
add esp, 0xc
mov byte [edi + esi], 0
mov eax, esi
jmp 0x4b1d04