WikiLeaks on Friday released what it claims to be a stolen CIA code that would prevent hacking and virus attacks from being traced back to the spy agency.

This “Marble” source code is used for “obfuscation” by altering the English language text in malware code into decoy languages. WikiLeaks said this tool could be used to throw forensic investigators and anti-virus companies off the CIA’s trail when investigating CIA-backed insurgents who are using U.S. produced weapons systems.