Function at 0x549820
Capabilities:
Clear file content
Encode data using xor
Get hostname
Get session user name
Query or enumerate registry value
Set registry value
Write file on windows

Disassembly:
sub esp, 0x2b4
push ebx
push ebp
push esi
push edi
push 0x5e5da4
mov dword [esp + 0x2c], ecx
lea esi, [ecx + 0x20]
call fcn.0054d6e0
add esp, 4
push eax
push esi
call fcn.005488b0
add esp, 8
lea eax, [esp + 0x24]
lea ecx, [esp + 0x18]
mov dword [esp + 0x10], 0
push eax
push ecx
push 0
push 0xf003f
push 0
push 0
push 0
push 0x5e5d6c
xor bl, bl
call fcn.0054d6e0
add esp, 4
push eax
push getpeername
call dword [sym.imp.ADVAPI32.dll_RegCreateKeyExA]
test eax, eax
jne 0x5499bf
mov eax, dword [esp + 0x24]
mov edi, dword [sym.imp.USER32.dll_wsprintfA]
cmp eax, 2
jne 0x549931
lea edx, [esp + 0x14]
lea eax, [esp + 0x40]
push edx
push eax
push 0
push 0
push 0x5e5d58
mov dword [esp + 0x28], 0x40
call fcn.0054d6e0
mov ecx, dword [esp + 0x2c]
mov ebp, dword [sym.imp.ADVAPI32.dll_RegQueryValueExA]
add esp, 4
push eax
push ecx
call ebp
push str.Wed_May__3_17:31:35_2006
lea edx, [esp + 0x84]
push 0x5e5d54
push edx
call edi
mov eax, dword [esp + 0x20]
add esp, 0xc
test eax, eax
je 0x549906
lea eax, [esp + 0x80]
lea ecx, [esp + 0x40]
push eax
push ecx
call dword [sym.imp.KERNEL32.dll_lstrcmpA]
test eax, eax
jne 0x549906
mov bl, 1
lea edx, [esp + 0x14]
lea eax, [esp + 0x10]
push edx
push eax
push 0
push 0
push 0x5e5d44
mov dword [esp + 0x28], 4
call fcn.0054d6e0
mov ecx, dword [esp + 0x2c]
add esp, 4
push eax
push ecx
call ebp
push str.Wed_May__3_17:31:35_2006
lea edx, [esp + 0x44]
push 0x5e5d54
push edx
call edi
add esp, 0xc
lea eax, [esp + 0x40]
push eax
call dword [sym.imp.KERNEL32.dll_lstrlenA]
inc eax
lea ecx, [esp + 0x40]
push eax
push ecx
push 1
push 0
push 0x5e5d30
mov dword [esp + 0x28], eax
call fcn.0054d6e0
mov edx, dword [esp + 0x2c]
mov edi, dword [sym.imp.ADVAPI32.dll_RegSetValueExA]
add esp, 4
push eax
push edx
call edi
test bl, bl
mov dword [esp + 0x14], 4
je 0x54998c
inc dword [esp + 0x10]
jmp 0x549994
mov dword [esp + 0x10], 0
lea eax, [esp + 0x10]
push 4
push eax
push 4
push 0
push 0x5e5d44
call fcn.0054d6e0
mov ecx, dword [esp + 0x2c]
add esp, 4
push eax
push ecx
call edi
mov edx, dword [esp + 0x18]
push edx
call dword [sym.imp.ADVAPI32.dll_RegCloseKey]
mov eax, dword [esp + 0x10]
cmp eax, 1
je 0x549e0a
cmp eax, 5
ja 0x549e0a
test bl, bl
je 0x5499e6
cmp dword [0x887f5c], 9
jge 0x549e0a
push 0x5e5d20
call fcn.0054d6e0
add esp, 4
push eax
push esi
call fcn.005488b0
mov eax, dword [esi]
add esp, 8
cmp eax, 0xffffffff
je 0x549b39
lea edi, [esi + 0x101c]
push edi
call dword [sym.imp.KERNEL32.dll_GetLocalTime]
mov eax, dword [esi + 0x1034]
test eax, eax
je 0x549a2e
mov ecx, dword [esi + 0x1038]
cmp ecx, eax
mov eax, 0x5e50ac
ja 0x549a33
mov eax, 0x887fcc
push eax
xor eax, eax
mov ax, word [esi + 0x102a]
xor ecx, ecx
mov cx, word [esi + 0x1028]
push eax
xor edx, edx
xor eax, eax
mov dx, word [esi + 0x1026]
mov ax, word [esi + 0x1024]
push ecx
push edx
xor ecx, ecx
push eax
mov cx, word [esi + 0x1022]
xor edx, edx
mov dx, word [esi + 0x101e]
xor eax, eax
mov ax, word [edi]
push ecx
push edx
push eax
push 0x5e5054
lea ebp, [esi + 0x1c]
call fcn.0054d670
add esp, 4
push eax
push ebp
call fcn.0055e68c
mov edi, ebp
or ecx, 0xffffffff
xor eax, eax
add esp, 0x28
repne scasb al, byte es:[edi]
mov eax, dword [esi + 0x1030]
not ecx
dec ecx
test eax, eax
je 0x549ad5
test ecx, ecx
jle 0x549b03
mov edi, 0xffffffe4
mov eax, ebp
sub edi, esi
mov edx, dword [esi + 0x1030]
add edx, 2
mov dword [esi + 0x1030], edx
mov bl, byte [eax]
add dl, 0x43
xor bl, dl
mov byte [eax], bl
inc eax
lea edx, [edi + eax]
cmp edx, ecx
jl 0x549ab3
jmp 0x549b03
test ecx, ecx
jle 0x549b03
mov edi, 0xffffffe4
mov eax, ebp
sub edi, esi
mov edx, dword [esi + 0x102c]
lea edx, [edx + edx*2 + 1]
mov dword [esi + 0x102c], edx
mov bl, byte [eax]
add dl, 0x76
xor bl, dl
mov byte [eax], bl
inc eax
lea edx, [eax + edi]
cmp edx, ecx
jl 0x549ae2
cmp dword [esi + 0x1034], 0x3e7
je 0x549b21
lea eax, [esp + 0x20]
push 0
push eax
push ecx
mov ecx, dword [esi]
push ebp
push ecx
call dword [sym.imp.KERNEL32.dll_WriteFile]
mov edx, dword [esi]
push edx
call dword [sym.imp.KERNEL32.dll_SetEndOfFile]
mov eax, dword [esi]
push eax
call dword [sym.imp.KERNEL32.dll_CloseHandle]
mov dword [esi], 0xffffffff
mov ecx, 0x887d48
call fcn.0054be40
test eax, eax
jne 0x549b67
push 0x5e5d10
call fcn.0054d6e0
add esp, 4
mov ecx, 0x887d48
push eax
call fcn.0054bc30
test eax, eax
je 0x549e0a
push 0x5e5cfc
call fcn.0054d6e0
add esp, 4
mov ecx, 0x887d48
push eax
call fcn.0054be40
push eax
call fcn.0054ab80
push 0x5e5ce4
mov esi, eax
call fcn.0054d6e0
add esp, 4
mov ecx, 0x887d48
push eax
call fcn.0054be40
push eax
call fcn.0054ab80
push 0x5e5ccc
mov edi, eax
call fcn.0054d6e0
add esp, 4
mov ecx, 0x887d48
push eax
call fcn.0054be40
push eax
call fcn.0054ab80
push 0x5e5cbc
mov ebp, eax
call fcn.0054d6e0
add esp, 4
mov ecx, 0x887d48
push eax
call fcn.0054be40
push eax
call fcn.0054ab80
test esi, esi
mov dword [esp + 0x20], eax
je 0x549e0a
test edi, edi
je 0x549e0a
test ebp, ebp
je 0x549e0a
test eax, eax
je 0x549e0a
push 0
push 0
push 0
push 0
push 0x5e5cb0
call fcn.0054d670
add esp, 4
push eax
call esi
mov ebx, eax
test ebx, ebx
je 0x549e0a
push 0
push 0x8000000
push 1
push 0x5e5c7c
call fcn.0054d6e0
add esp, 4
push eax
push 0x5e5c70
call fcn.0054d670
add esp, 4
push eax
push 0x17ac
push 0x5e5c5c
call fcn.0054d670
add esp, 4
push eax
push ebx
call edi
mov esi, eax
test esi, esi
jne 0x549c7a
push ebx
call ebp
pop edi
pop esi
pop ebp
pop ebx
add esp, 0x2b4
ret
lea ecx, [esp + 0x1c]
lea edx, [esp + 0x140]
mov edi, 0x80
push ecx
push edx
mov byte [esp + 0x148], 0
mov dword [esp + 0x24], edi
call dword [sym.imp.KERNEL32.dll_GetComputerNameA]
lea eax, [esp + 0x1c]
lea ecx, [esp + 0xc0]
push eax
push ecx
mov byte [esp + 0xc8], 0
mov dword [esp + 0x24], edi
call dword [sym.imp.ADVAPI32.dll_GetUserNameA]
lea edx, [esp + 0x2c]
push edx
call dword [sym.imp.KERNEL32.dll_GetLocalTime]
mov eax, dword [0x887f5c]
cmp eax, 1
jne 0x549cd9
push 0x5e5c50
jmp 0x549d3e
cmp eax, 2
jne 0x549ce5
push 0x5e5c44
jmp 0x549d3e
cmp eax, 3
jne 0x549cf1
push 0x5e5c3c
jmp 0x549d3e
cmp eax, 4
jne 0x549cfd
push 0x5e5c30
jmp 0x549d3e
cmp eax, 5
jne 0x549d09
push 0x5e5c24
jmp 0x549d3e
cmp eax, 6
jne 0x549d15
push 0x5e5c14
jmp 0x549d3e
cmp eax, 7
jne 0x549d21
push 0x5e5c08
jmp 0x549d3e
cmp eax, 8
jne 0x549d2d
push 0x5e5bfc
jmp 0x549d3e
cmp eax, 9
jne 0x549d39
push 0x5e5bf0
jmp 0x549d3e
push 0x5e5be8
call fcn.0054d670
mov ecx, dword [esp + 0x3e]
mov edx, dword [esp + 0x3c]
add esp, 4
and ecx, 0xffff
and edx, 0xffff
push ecx
mov ecx, dword [esp + 0x3a]
and ecx, 0xffff
push edx
mov edx, dword [esp + 0x3c]
push ecx
mov ecx, dword [esp + 0x3e]
and edx, 0xffff
and ecx, 0xffff
push edx
mov edx, dword [esp + 0x3e]
push ecx
mov ecx, dword [esp + 0x40]
and edx, 0xffff
and ecx, 0xffff
push edx
push ecx
mov ecx, dword [esp + 0x44]
lea edx, [ecx + 0x1228]
add ecx, 0x1200
push edx
lea edx, [esp + 0xe0]
push edx
lea edx, [esp + 0x164]
push edx
mov edx, dword [0x887f94]
mov edx, dword [edx + 0x10]
push edx
push eax
push 0x2f
push ecx
push 0x5e5b8c
call fcn.0054d6e0
add esp, 4
push eax
lea eax, [esp + 0x1fc]
push 0x104
push eax
call fcn.00560aaf
add esp, 0x44
lea ecx, [esp + 0x1c0]
push 0
push 0x4000002
push ecx
push 0x887c3c
push esi
call dword [esp + 0x34]
call dword [sym.imp.KERNEL32.dll_GetLastError]
push ebx
call ebp
push esi
call ebp
pop edi
pop esi
pop ebp
pop ebx
add esp, 0x2b4
ret