static void Deobfuscation()
{
string sampleScript = "";
string scriptPath = "Data\\sample_1.ps1";
string modelPath = "Data\\ObfuscationClassifierModel.zip";
FileInfo file = new FileInfo(scriptPath);
try
{
FileStream fs = new FileStream(scriptPath, FileMode.Open, FileAccess.Read);
TextReader scriptIn = new StreamReader(fs);
sampleScript = scriptIn.ReadToEnd();
}
catch
{
return;
}
AstTree tree = new AstTree(sampleScript);
tree.InitPipeSubTree();
TraverseSubTree traverser = new TraverseSubTree(modelPath);
traverser.TraverseCheckPipeSubtree(tree);
Console.Out.WriteLine(tree.root.updatedCommand);
}
public List <DeobfuscationResult> ReverseTraverseCheckSubtreeWithExperimentalOutput(AstTree tree)
{
AstNode node = tree.root;
Queue <AstNode> unvisitedNodeQueue = new Queue <AstNode>();
unvisitedNodeQueue.Enqueue(node);
Stack <AstNode> pipeNodeStack = new Stack <AstNode>();
while (unvisitedNodeQueue.Count > 0)
{
AstNode n = unvisitedNodeQueue.Dequeue();
if (n.ast.GetType().ToString() == "System.Management.Automation.Language.PipelineAst")
{
pipeNodeStack.Push(n);
}
foreach (AstNode nc in n.childList)
{
unvisitedNodeQueue.Enqueue(nc);
}
}
InstancePF psIns = new InstancePF();
List <DeobfuscationResult> outputList = new List <DeobfuscationResult>();
while (pipeNodeStack.Count > 0)
{
AstNode n = pipeNodeStack.Pop();
Classifier.ClassifierResult result = c.testWithModel(AstTree.Tree2Feature(n));
DeobfuscationResult output = new DeobfuscationResult();
output.originalScript = AstNode.GetShapedScript(n.ast.Extent.Text);
if (result != Classifier.ClassifierResult.unobfuscated)
{
string returnScript = psIns.addScript(n.ast.Extent.Text);
Console.Out.WriteLine(String.Format("Script:{0}, result:{1}, Deobfuscation:{2}", n.ast.Extent.Text, result, returnScript));
output.obfuscated = 1;
output.deobfuscatedScript = AstNode.GetShapedScript(returnScript);
if (returnScript.Length != 0)
{
tree.RemoveSubTree(n, n.childList[0]);
}
tree.AddSubTree(n, returnScript);
}
else
{
Console.Out.WriteLine(String.Format("Script:{0}, result:{1}", n.ast.Extent.Text, result));
}
outputList.Add(output);
}
return(outputList);
}
public void ReverseTraverseCheckSubtree(AstTree tree)
{
AstNode node = tree.root;
Queue <AstNode> unvisitedNodeQueue = new Queue <AstNode>();
unvisitedNodeQueue.Enqueue(node);
Stack <AstNode> pipeNodeStack = new Stack <AstNode>();
while (unvisitedNodeQueue.Count > 0)
{
AstNode n = unvisitedNodeQueue.Dequeue();
if (n.ast.GetType().ToString() == "System.Management.Automation.Language.PipelineAst")
{
pipeNodeStack.Push(n);
}
foreach (AstNode nc in n.childList)
{
unvisitedNodeQueue.Enqueue(nc);
}
}
while (pipeNodeStack.Count > 0)
{
AstNode n = pipeNodeStack.Pop();
Classifier.ClassifierResult result = c.testWithModel(AstTree.Tree2Feature(n));
if (result != Classifier.ClassifierResult.unobfuscated)
{
// what to do with the obfuscated sub-tree
string returnScript = psIns.addScript(n.ast.Extent.Text);
Console.Out.WriteLine(String.Format("Script:{0}, result:{1}, Deobfuscation:{2}", n.ast.Extent.Text, result, returnScript));
tree.AddSubTree(n, returnScript);
}
else
{
Console.Out.WriteLine(String.Format("Script:{0}, result:{1}", n.ast.Extent.Text, result));
}
}
}
public void TraverseCheckSubtree(AstNode node)
{
Queue <AstNode> unvisitedNodeQueue = new Queue <AstNode>();
unvisitedNodeQueue.Enqueue(node);
while (unvisitedNodeQueue.Count > 0)
{
AstNode n = unvisitedNodeQueue.Dequeue();
if (n.ast.GetType().ToString() == "System.Management.Automation.Language.PipelineAst")
{
AstData data = AstTree.Tree2Feature(n);
Classifier.ClassifierResult result = c.testWithModel(data);
Console.Out.WriteLine(String.Format("Script:{0}, result:{1}", n.ast.Extent.Text, result.ToString()));
}
foreach (AstNode nc in n.childList)
{
unvisitedNodeQueue.Enqueue(nc);
}
}
}
public int TraverseCheckPipeSubtree(AstTree tree)
{
int obfuscatedOrNot = 0;
Queue <AstNode> pipeQueue = new Queue <AstNode>();
AstTree subtree;
AstNode parent;
foreach (AstNode node in tree.nodeList)
{
if (node.type == AstNode.NodeType.pipeNode)
{
pipeQueue.Enqueue(node);
}
}
AstNode top;
while (pipeQueue.Count != 0)
{
top = pipeQueue.Dequeue();
int subtreePipeCount = -1;
if (top.pipeNodeCount != 0)
{
pipeQueue.Enqueue(top);
}
else
{
if (c.testWithModel(AstTree.Tree2Feature(top)) == Classifier.ClassifierResult.unobfuscated)
{
top.type = AstNode.NodeType.cleanPipeNode;
string feature = new Script2Vector(top.command).ToAStString();
Console.Out.WriteLine(feature);
if (top.updatedCommand.Length == 0)
{
top.updatedCommand = top.command;
}
}
else
{
try
{
string tempCommand = "";
tempCommand = psIns.addScript(top.command);
if (tempCommand.Length == 0)
{
top.type = AstNode.NodeType.cleanPipeNode;
goto a;
}
else
{
tempCommand = CheckParents(tempCommand, top);
top.updatedCommand = tempCommand;
}
}
catch
{
top.type = AstNode.NodeType.cleanPipeNode;
goto a;
}
obfuscatedOrNot = 1;
subtree = new AstTree(top.updatedCommand, AstNode.NodeType.replaceNode);
subtree.InitPipeSubTree();
tree.ReplaceSubTree(top.parent, top, subtree);
Queue <AstNode> newQueue = AstTree.FindAllPipeNodeInSubTree(subtree.root);
AstNode node;
while (newQueue.Count != 0)
{
node = newQueue.Dequeue();
}
a :;
}
parent = top.parent;
while (!(parent.parent == null || parent.type == AstNode.NodeType.pipeNode))
{
parent = parent.parent;
}
parent.UpdateCommand(top.command, top.updatedCommand);
experimentOut.WriteLine(String.Format("{0}`{2}`{1}", AstNode.GetShapedScript(top.command), AstNode.GetShapedScript(top.updatedCommand), top.command != top.updatedCommand));
parent = top.parent;
while (parent.parent != null)
{
parent.pipeNodeCount += subtreePipeCount;
if (parent.pipeNodeCount == 0)
{
tree.Shrink(parent);
}
parent = parent.parent;
}
}
}
return(obfuscatedOrNot);
}
public void TraverseCheckSubtree(AstTree tree)
{
TraverseCheckSubtree(tree.root);
}