My Simple Obfuscator

June 6, 2018

Difficulty : 3.2/10
Language : C#
Platform : Windows
OS Version : All
Packer / Protector : My New Protector (NightProtectorLite 1.0)

Description :

PRO: Unpack the file, get strings, clean file, (not need keep working) and make a Short Tut for it.

NewBie: Get Passwd

Screenshot :

Protected.exe

June 7, 2018

I haven't fully unpacked it yet but I believe the password is

Spoiler

challange_me_nick

June 7, 2018

if (Operators.CompareString(this.TextBox1.Text, "challange_me_nick",

Spoiler

public void test(ModuleDefMD module)
{
var globalt = module.GlobalType;
var modulector = globalt.FindStaticConstructor();
var mbody = modulector.Body.Instructions;
for (int i = 0; i < mbody.Count; i++)
{
if(mbody.IsLdcI4() && mbody[i+1].OpCode == OpCodes.Stsfld)
{
int originalvalue = mbody.GetLdcI4Value();
var field = (FieldDef)mbody[i + 1].Operand;
SearchAndReplace(originalvalue, field, module);
}
if (mbody.OpCode == OpCodes.Ldstr && mbody[i + 1].OpCode == OpCodes.Stsfld)
{
string originalvalue = (string)mbody.GetOperand();
var field = (FieldDef)mbody[i + 1].Operand;
SearchAndReplace(originalvalue, field, module);
}
}

foreach (var t in module.GetTypes())
{
if (t.IsGlobalModuleType) continue;
foreach (var m in t.Methods)
{
if (!m.HasBody) continue;
if (m.FullName.Contains("My")) continue;

var inst = m.Body.Instructions;
for (int i = 0; i < inst.Count; i++)
{
if(inst.OpCode == OpCodes.Call)
{
if(inst.Operand.ToString().Contains("<Module>::smethod_0"))
{
var xor1 = inst[i - 2].GetLdcI4Value();
var xor2 = inst[i - 1].GetLdcI4Value();

var result = smethod_0(xor1, xor2);

inst[i - 2].OpCode = OpCodes.Nop;
inst[i - 1].OpCode = OpCodes.Nop;

inst = Instruction.CreateLdcI4(result);
}

if (inst.Operand.ToString().Contains("<Module>::smethod_2"))
{
string str1 = inst[i - 3].Operand.ToString();
string str2 = inst[i - 2].Operand.ToString();
var str3 = "STOP_USE_DE4DOT";

var result = smethod_2(str1, str2, str3);

inst[i - 3].OpCode = OpCodes.Nop;
inst[i - 2].OpCode = OpCodes.Nop;
inst[i - 1].OpCode = OpCodes.Nop;

inst.OpCode = OpCodes.Ldstr;
inst.Operand = result;

}
}
}
}
}
}

public static int smethod_0(int int_167, int int_168)
{
return int_167 ^ int_168;
}

public static string smethod_1(string string_11, string string_12)
{
StringBuilder stringBuilder = new StringBuilder();
StringBuilder stringBuilder2 = new StringBuilder();
byte[] bytes = Encoding.UTF8.GetBytes(string_11);
string @string = Encoding.UTF8.GetString(bytes);
stringBuilder2.Append(@string);
Encoding.UTF8.GetBytes(string_12);
for (int i = smethod_0(1123953987, 1123953986); i < Strings.Len(@string) + smethod_0(242310766, 242310767); i += smethod_0(1572991755, 1572991754))
{
stringBuilder.Append(Strings.ChrW(Strings.AscW(Strings.GetChar(stringBuilder2.ToString(), i)) - Strings.AscW(Strings.GetChar(string_12, i % Strings.Len(string_12) + smethod_0(1772514014, 1772514015)))));
}
return stringBuilder.ToString();
}

public static string smethod_2(string string_11, string string_12, string string_13)
{
StringBuilder stringBuilder = new StringBuilder();
StringBuilder stringBuilder2 = new StringBuilder();
byte[] bytes = Encoding.UTF8.GetBytes(string_11);
string @string = Encoding.UTF8.GetString(bytes);
stringBuilder2.Append(@string);
Encoding.UTF8.GetBytes(string_12);
for (int i = smethod_0(1122958906, 1122958907); i < Strings.Len(@string) + smethod_0(542987602, 542987603); i += smethod_0(1459259408, 1459259409))
{
stringBuilder.Append(Strings.ChrW(Strings.AscW(Strings.GetChar(stringBuilder2.ToString(), i)) - Strings.AscW(Strings.GetChar(string_12, i % Strings.Len(string_12) + smethod_0(1694326791, 1694326790)))));
}
byte[] bytes2 = Convert.FromBase64String(stringBuilder.ToString());
string string2 = Encoding.UTF8.GetString(bytes2);
return smethod_1(string2, string_13);
}

public void SearchAndReplace(int originalvalue, FieldDef field, ModuleDefMD module)
{
foreach (var t in module.GetTypes())
{
foreach (var m in t.Methods)
{
if (m.Rid == 1) continue;

if (!m.HasBody) continue;
for (int i = 0; i < m.Body.Instructions.Count; i++)
{
if(m.Body.Instructions.OpCode == OpCodes.Ldsfld)
{
var target = m.Body.Instructions.GetOperand();

if(target.ToString().ToLower().Contains(field.Name.ToLower()))
{
m.Body.Instructions = Instruction.CreateLdcI4(originalvalue);
}

}
}
}
}
}

public void SearchAndReplace(string originalvalue, FieldDef field, ModuleDefMD module)
{
foreach (var t in module.GetTypes())
{
foreach (var m in t.Methods)
{
if (m.Rid == 1) continue;

if (!m.HasBody) continue;
for (int i = 0; i < m.Body.Instructions.Count; i++)
{
if (m.Body.Instructions.OpCode == OpCodes.Ldsfld)
{
var target = m.Body.Instructions.GetOperand();

try
{
if ((FieldDef)target == field)
{
m.Body.Instructions.OpCode = OpCodes.Ldstr;
m.Body.Instructions.Operand = originalvalue;
}
}
catch
{
//
}
}
}
}
}
}

June 7, 2018

16 hours ago, XenocodeRCE said:

if (Operators.CompareString(this.TextBox1.Text, "challange_me_nick",

Hide contents

public void test(ModuleDefMD module)
{
var globalt = module.GlobalType;
var modulector = globalt.FindStaticConstructor();
var mbody = modulector.Body.Instructions;
for (int i = 0; i < mbody.Count; i++)
{
if(mbody.IsLdcI4() && mbody[i+1].OpCode == OpCodes.Stsfld)
{
int originalvalue = mbody.GetLdcI4Value();
var field = (FieldDef)mbody[i + 1].Operand;
SearchAndReplace(originalvalue, field, module);
}
if (mbody.OpCode == OpCodes.Ldstr && mbody[i + 1].OpCode == OpCodes.Stsfld)
{
string originalvalue = (string)mbody.GetOperand();
var field = (FieldDef)mbody[i + 1].Operand;
SearchAndReplace(originalvalue, field, module);
}
}

foreach (var t in module.GetTypes())
{
if (t.IsGlobalModuleType) continue;
foreach (var m in t.Methods)
{
if (!m.HasBody) continue;
if (m.FullName.Contains("My")) continue;

var inst = m.Body.Instructions;
for (int i = 0; i < inst.Count; i++)
{
if(inst.OpCode == OpCodes.Call)
{
if(inst.Operand.ToString().Contains("<Module>::smethod_0"))
{
var xor1 = inst[i - 2].GetLdcI4Value();
var xor2 = inst[i - 1].GetLdcI4Value();

var result = smethod_0(xor1, xor2);

inst[i - 2].OpCode = OpCodes.Nop;
inst[i - 1].OpCode = OpCodes.Nop;

inst = Instruction.CreateLdcI4(result);
}

if (inst.Operand.ToString().Contains("<Module>::smethod_2"))
{
string str1 = inst[i - 3].Operand.ToString();
string str2 = inst[i - 2].Operand.ToString();
var str3 = "STOP_USE_DE4DOT";

var result = smethod_2(str1, str2, str3);

inst[i - 3].OpCode = OpCodes.Nop;
inst[i - 2].OpCode = OpCodes.Nop;
inst[i - 1].OpCode = OpCodes.Nop;

inst.OpCode = OpCodes.Ldstr;
inst.Operand = result;

}
}
}
}
}
}

public static int smethod_0(int int_167, int int_168)
{
return int_167 ^ int_168;
}

public static string smethod_1(string string_11, string string_12)
{
StringBuilder stringBuilder = new StringBuilder();
StringBuilder stringBuilder2 = new StringBuilder();
byte[] bytes = Encoding.UTF8.GetBytes(string_11);
string @string = Encoding.UTF8.GetString(bytes);
stringBuilder2.Append(@string);
Encoding.UTF8.GetBytes(string_12);
for (int i = smethod_0(1123953987, 1123953986); i < Strings.Len(@string) + smethod_0(242310766, 242310767); i += smethod_0(1572991755, 1572991754))
{
stringBuilder.Append(Strings.ChrW(Strings.AscW(Strings.GetChar(stringBuilder2.ToString(), i)) - Strings.AscW(Strings.GetChar(string_12, i % Strings.Len(string_12) + smethod_0(1772514014, 1772514015)))));
}
return stringBuilder.ToString();
}

public static string smethod_2(string string_11, string string_12, string string_13)
{
StringBuilder stringBuilder = new StringBuilder();
StringBuilder stringBuilder2 = new StringBuilder();
byte[] bytes = Encoding.UTF8.GetBytes(string_11);
string @string = Encoding.UTF8.GetString(bytes);
stringBuilder2.Append(@string);
Encoding.UTF8.GetBytes(string_12);
for (int i = smethod_0(1122958906, 1122958907); i < Strings.Len(@string) + smethod_0(542987602, 542987603); i += smethod_0(1459259408, 1459259409))
{
stringBuilder.Append(Strings.ChrW(Strings.AscW(Strings.GetChar(stringBuilder2.ToString(), i)) - Strings.AscW(Strings.GetChar(string_12, i % Strings.Len(string_12) + smethod_0(1694326791, 1694326790)))));
}
byte[] bytes2 = Convert.FromBase64String(stringBuilder.ToString());
string string2 = Encoding.UTF8.GetString(bytes2);
return smethod_1(string2, string_13);
}

public void SearchAndReplace(int originalvalue, FieldDef field, ModuleDefMD module)
{
foreach (var t in module.GetTypes())
{
foreach (var m in t.Methods)
{
if (m.Rid == 1) continue;

if (!m.HasBody) continue;
for (int i = 0; i < m.Body.Instructions.Count; i++)
{
if(m.Body.Instructions.OpCode == OpCodes.Ldsfld)
{
var target = m.Body.Instructions.GetOperand();

if(target.ToString().ToLower().Contains(field.Name.ToLower()))
{
m.Body.Instructions = Instruction.CreateLdcI4(originalvalue);
}

}
}
}
}
}

public void SearchAndReplace(string originalvalue, FieldDef field, ModuleDefMD module)
{
foreach (var t in module.GetTypes())
{
foreach (var m in t.Methods)
{
if (m.Rid == 1) continue;

if (!m.HasBody) continue;
for (int i = 0; i < m.Body.Instructions.Count; i++)
{
if (m.Body.Instructions.OpCode == OpCodes.Ldsfld)
{
var target = m.Body.Instructions.GetOperand();

try
{
if ((FieldDef)target == field)
{
m.Body.Instructions.OpCode = OpCodes.Ldstr;
m.Body.Instructions.Operand = originalvalue;
}
}
catch
{
//
}
}
}
}
}
}

Congratulations! You Are incredible

June 7, 2018

18 hours ago, jameswoods said:

I haven't fully unpacked it yet but I believe the password is

Reveal hidden contents

challange_me_nick

Thank you to try You are incredible

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