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Support Confuser 1.7 r73404 resource encrypter

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This commit is contained in:
de4dot 2012-08-02 18:26:01 +02:00
parent b5ef7a7b12
commit 13420b80eb
1 changed files with 66 additions and 3 deletions
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69
de4dot.code/deobfuscators/Confuser/ResourceDecrypter.cs
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@ -38,6 +38,7 @@ namespace de4dot.code.deobfuscators.Confuser {
enum ConfuserVersion {
Unknown,
v14_r55802,
v17_r73404,
vXX,
}
@ -82,9 +83,14 @@ namespace de4dot.code.deobfuscators.Confuser {
simpleDeobfuscator.deobfuscate(tmpHandler, true);
ConfuserVersion tmpVersion = ConfuserVersion.Unknown;
if (DotNetUtils.callsMethod(tmpHandler, "System.Object System.AppDomain::GetData(System.String)")) {
tmpVersion = ConfuserVersion.v14_r55802;
if (!findKey0Key1_v14_r55802(tmpHandler, out key0, out key1))
if (!DotNetUtils.callsMethod(tmpHandler, "System.Void System.Buffer::BlockCopy(System.Array,System.Int32,System.Array,System.Int32,System.Int32)")) {
if (!findKey0Key1_v14_r55802(tmpHandler, out key0, out key1))
return false;
tmpVersion = ConfuserVersion.v14_r55802;
}
else if (findKey0_v17_r73404(tmpHandler, out key0) && findKey1_v17_r73404(tmpHandler, out key1))
tmpVersion = ConfuserVersion.v17_r73404;
else
return false;
}
else {
@ -246,6 +252,51 @@ namespace de4dot.code.deobfuscators.Confuser {
return false;
}
static bool findKey0_v17_r73404(MethodDefinition method, out byte key) {
var instrs = method.Body.Instructions;
for (int i = 0; i < instrs.Count - 3; i++) {
int index = ConfuserUtils.findCallMethod(instrs, i, Code.Callvirt, "System.Byte[] System.IO.BinaryReader::ReadBytes(System.Int32)");
if (index < 0)
break;
if (index + 3 >= instrs.Count)
break;
if (!DotNetUtils.isStloc(instrs[index + 1]))
continue;
var ldci4 = instrs[index + 2];
if (!DotNetUtils.isLdcI4(ldci4))
continue;
if (!DotNetUtils.isStloc(instrs[index + 3]))
continue;
key = (byte)DotNetUtils.getLdcI4Value(ldci4);
return true;
}
key = 0;
return false;
}
static bool findKey1_v17_r73404(MethodDefinition method, out byte 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 (instrs[i + 1].OpCode.Code != Code.Mul)
continue;
var ldci4_2 = instrs[i + 2];
if (!DotNetUtils.isLdcI4(ldci4_2) || DotNetUtils.getLdcI4Value(ldci4_2) != 0x100)
continue;
if (instrs[i + 3].OpCode.Code != Code.Rem)
continue;
key = (byte)DotNetUtils.getLdcI4Value(ldci4_1);
return true;
}
key = 0;
return false;
}
public EmbeddedResource mergeResources() {
if (resource == null)
return null;
@ -258,6 +309,7 @@ namespace de4dot.code.deobfuscators.Confuser {
byte[] decryptResource() {
switch (version) {
case ConfuserVersion.v14_r55802: return decrypt_v14_r55802();
case ConfuserVersion.v17_r73404: return decrypt_v17_r73404();
case ConfuserVersion.vXX: return decrypt_vXX();
default: throw new ApplicationException("Unknown version");
}
@ -275,6 +327,17 @@ namespace de4dot.code.deobfuscators.Confuser {
return reader.ReadBytes(reader.ReadInt32());
}
byte[] decrypt_v17_r73404() {
var reader = new BinaryReader(new MemoryStream(DeobUtils.inflate(resource.GetResourceData(), true)));
var decrypted = reader.ReadBytes(reader.ReadInt32());
byte k = key0;
for (int i = 0; i < decrypted.Length; i++) {
decrypted[i] ^= k;
k *= key1;
}
return decrypted;
}
byte[] decrypt_vXX() {
var encrypted = resource.GetResourceData();
byte k = key0;