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Support Confuser 1.4 r58852 compressor

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This commit is contained in:
de4dot 2012-08-01 14:05:29 +02:00
parent 99f0f8f480
commit 910472ad04
1 changed files with 57 additions and 10 deletions
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67
de4dot.code/deobfuscators/Confuser/Unpacker.cs
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@ -48,7 +48,6 @@ namespace de4dot.code.deobfuscators.Confuser {
class Unpacker {
ModuleDefinition module;
EmbeddedResource mainAsmResource;
List<EmbeddedResource> resources = new List<EmbeddedResource>();
uint key0, key1;
ConfuserVersion version = ConfuserVersion.Unknown;
MethodDefinition asmResolverMethod;
@ -58,6 +57,7 @@ namespace de4dot.code.deobfuscators.Confuser {
v10_r42915,
v14_r58564,
v14_r58802,
v14_r58852,
}
public bool Detected {
@ -112,8 +112,14 @@ namespace de4dot.code.deobfuscators.Confuser {
case ConfuserVersion.v14_r58564:
case ConfuserVersion.v14_r58802:
simpleDeobfuscator.deobfuscate(decyptMethod);
if (!findKey0(decyptMethod, out key0))
throw new ApplicationException("Could not find magic");
if (findKey0_v14_r58564(decyptMethod, out key0))
break;
if (findKey0_v14_r58852(decyptMethod, out key0)) {
version = ConfuserVersion.v14_r58852;
break;
}
throw new ApplicationException("Could not find magic");
break;
default:
@ -126,7 +132,6 @@ namespace de4dot.code.deobfuscators.Confuser {
mainAsmResource = findResource(cctor);
if (mainAsmResource == null)
throw new ApplicationException("Could not find main assembly resource");
resources.Add(mainAsmResource);
}
static MethodDefinition findAssemblyResolverMethod(TypeDefinition type) {
@ -141,7 +146,7 @@ namespace de4dot.code.deobfuscators.Confuser {
return null;
}
static bool findKey0(MethodDefinition method, out uint key) {
static bool findKey0_v14_r58564(MethodDefinition method, out uint key) {
var instrs = method.Body.Instructions;
for (int i = 0; i < instrs.Count - 2; i++) {
if (instrs[i].OpCode.Code != Code.Xor)
@ -159,6 +164,27 @@ namespace de4dot.code.deobfuscators.Confuser {
return false;
}
static bool findKey0_v14_r58852(MethodDefinition method, out uint key) {
var instrs = method.Body.Instructions;
for (int i = 0; i < instrs.Count - 3; i++) {
var ldci4_1 = instrs[i];
if (!DotNetUtils.isLdcI4(ldci4_1))
continue;
if (!DotNetUtils.isStloc(instrs[i + 1]))
continue;
var ldci4_2 = instrs[i + 2];
if (!DotNetUtils.isLdcI4(ldci4_2) && DotNetUtils.getLdcI4Value(ldci4_2) != 0)
continue;
if (!DotNetUtils.isStloc(instrs[i + 3]))
continue;
key = (uint)DotNetUtils.getLdcI4Value(ldci4_1);
return true;
}
key = 0;
return false;
}
static bool findKey1(MethodDefinition method, out uint key) {
var instrs = method.Body.Instructions;
for (int i = 0; i < instrs.Count - 4; i++) {
@ -231,15 +257,36 @@ namespace de4dot.code.deobfuscators.Confuser {
byte[] decrypt(EmbeddedResource resource) {
var data = resource.GetResourceData();
switch (version) {
case ConfuserVersion.v10_r42915: return decrypt_v10_r42915(data);
case ConfuserVersion.v14_r58564: return decrypt_v14_r58564(data);
case ConfuserVersion.v14_r58802: return decrypt_v14_r58564(data);
case ConfuserVersion.v14_r58852: return decrypt_v14_r58852(data);
default: throw new ApplicationException("Unknown version");
}
}
byte[] decrypt_v10_r42915(byte[] data) {
for (int i = 0; i < data.Length; i++)
data[i] ^= (byte)(i ^ key0);
data = DeobUtils.inflate(data, true);
return DeobUtils.inflate(data, true);
}
if (version != ConfuserVersion.v10_r42915) {
var reader = new BinaryReader(new MemoryStream(data));
data = reader.ReadBytes(reader.ReadInt32());
byte[] decrypt_v14_r58564(byte[] data) {
var reader = new BinaryReader(new MemoryStream(decrypt_v10_r42915(data)));
return reader.ReadBytes(reader.ReadInt32());
}
byte[] decrypt_v14_r58852(byte[] data) {
var reader = new BinaryReader(new MemoryStream(DeobUtils.inflate(data, true)));
data = reader.ReadBytes(reader.ReadInt32());
for (int i = 0; i < data.Length; i++) {
if ((i & 1) == 0)
data[i] ^= (byte)((key0 & 0xF) - i);
else
data[i] ^= (byte)((key0 >> 4) + i);
data[i] -= (byte)i;
}
return data;
}