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Babel fixes #43

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Merged
meck-gd merged 2 commits into from
Sep 24, 2026
+11 −2
Merged

Babel fixes #43

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cf72870
Babel .NET: Add another double obfuscation guard
meck-gd Sep 24, 2026
bc8e9cc
Babel .NET: Add missing MethodCallInliner emu opcodes
meck-gd Sep 24, 2026
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10 changes: 8 additions & 2 deletions de4dot.code/deobfuscators/Babel_NET/BabelMethodCallInliner.cs
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Original file line number Diff line number Diff line change
Expand Up @@ -116,8 +116,10 @@ bool InlineMethod(Instruction callInstr, int instrIndex) {
if (!GetNewValue(methodToInline, ldci4.GetLdcI4Value(), out int newValue))
return false;

block.Instructions[instrIndex - 1] = new Instr(OpCodes.Nop.ToInstruction());
block.Instructions[instrIndex] = new Instr(Instruction.CreateLdcI4(newValue));
block.Instructions[instrIndex - 1].Instruction.OpCode = OpCodes.Nop;
var newLdc = Instruction.CreateLdcI4(newValue);
block.Instructions[instrIndex].Instruction.OpCode = newLdc.OpCode;
block.Instructions[instrIndex].Instruction.Operand = newLdc.Operand;
return true;
}

Expand Down Expand Up @@ -171,6 +173,10 @@ bool GetNewValue(MethodDef method, int arg, out int newValue) {
case Code.Sub:
case Code.Xor:
case Code.Or:
case Code.Shl:
case Code.Shr:
case Code.Neg:
case Code.Not:
case Code.Nop:
case Code.Dup:
case Code.Mul:
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3 changes: 3 additions & 0 deletions de4dot.code/deobfuscators/Babel_NET/StringDecrypter.cs
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Expand Up @@ -247,6 +247,9 @@ IDecrypterInfo CheckNested(TypeDef type, TypeDef nested) {
// Check for string,int variant with 3 nested fields and key length 16.
// When .NET Reactor was applied on top, field count is +1 due to an extraneous object field.
if (CheckFields(nested, "System.Byte[]", nested)) {
if (BabelUtils.IsChainedObfuscation(nested.FindMethod(".ctor")))
return null;

var nestedDecrypter16 = DotNetUtils.GetMethod(nested, "System.String", "(System.String,System.Int32)");
if (nestedDecrypter16 is { IsStatic: false }) {
var decrypter16 = DotNetUtils.GetMethod(type, "System.String", "(System.String,System.Int32)");
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