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JWUnpacker

JWUnpacker is a set of tools to unpack java-to-exe files converted by JWrapper.

This comprises of 3 tools:

  1. JWAgent : A JVM TI agent to hook into the class loading process
  2. JWServer: Recieves class files from JWAgent, removes anti-debug and dumps them.
  3. JWDecrypter: Decrypts encrypted files.

JWAgent and JWServer works in tandem.

Workflow

Step -1

First, you would need to get the right command line passed to java.exe. You should be able to find this by using a debugger like OllyDbg, setting a breakpoint on CreateProcessW.

The command line would look similar to the following:

"C:\Documents and Settings\Administrator\Application Data\JWrapper-FindSpace\JWrapper-Windows32JRE-00029224476-complete\bin\FindSpace.exe" -cp "C:\Documents and Settings\Administrator\Application Data\JWrapper-FindSpace\JWrapper-FindSpace-00029226110-complete\fspace.jar;C:\Documents and Settings\Administrator\Application Data\JWrapper-FindSpace\JWrapper-FindSpace-00029226110-complete\liquidlnf.jar;C:\Documents and Settings\Administrator\Application Data\JWrapper-FindSpace\JWrapper-FindSpace-00029226110-complete\jwcrypt.jar;C:\Documents and Settings\Administrator\Application Data\JWrapper-FindSpace\JWrapper-FindSpace-00029226110-complete\jwrapper_utils.jar;" -Xmx512m -Dcom.ibm.tools.attach.enable=false -XX:+DisableAttachMechanism jwrapper.JWrapper "C:\Documents and Settings\Administrator\Application Data\JWrapper-FindSpace\JWrapper-FindSpace-00029226110-complete\JWLaunchProperties-1494665842828-44"

The command line paramaters to JWAgent would be modified as shown below:

"C:\Documents and Settings\Administrator\Application Data\JWrapper-FindSpace\JWrapper-Windows32JRE-00029224476-complete\bin\FindSpace.exe" -cp "C:\Documents and Settings\Administrator\Application Data\JWrapper-FindSpace\JWrapper-FindSpace-00029226110-complete\fspace.jar;C:\Documents and Settings\Administrator\Application Data\JWrapper-FindSpace\JWrapper-FindSpace-00029226110-complete\liquidlnf.jar;C:\Documents and Settings\Administrator\Application Data\JWrapper-FindSpace\JWrapper-FindSpace-00029226110-complete\jwcrypt.jar;C:\Documents and Settings\Administrator\Application Data\JWrapper-FindSpace\JWrapper-FindSpace-00029226110-complete\jwrapper_utils.jar;" -Xmixed -agentlib:JWAgent jwrapper.JWrapper "C:\Documents and Settings\Administrator\Application Data\JWrapper-FindSpace\JWrapper-FindSpace-00029226110-complete\JWLaunchProperties-1494665842828-44"

Note the params -Xmixed and -agentlib:JWAgent.

JWServer must be run before invoking JWAgent.

Step - 2

JWServer would dump 6 class files. Copy them over to JWDecrpyter/build/jwrapper/crypt directory. Refer to JWDecrypter for detailed info.