Reader Mark Wilson writes: Today, WikiLeaks published the third installment of its Vault 7 CIA leaks. We've already had the Year Zero files which revealed a number of exploits for popular hardware and software, and the Dark Matter batch which focused on Mac and iPhone exploits. Now we have Marble to look at. A collection of 676 source code files, the Marble cache reveals details of the CIA's Marble Framework tool, used to hide the true source of CIA malware, and sometimes going as far as appearing to originate from countries other than the US. The source code for Marble Framework is tiny -- WikiLeaks has provided it in a zip file that's only around 0.5MB. WikiLeaks explains that the tool is used by the CIA to hide the fact that it is behind malware attacks that are unleashed on targets: "Marble is used to hamper forensic investigators and anti-virus companies from attributing viruses, trojans and hacking attacks to the CIA. Marble does this by hiding ("obfuscating") text fragments used in CIA malware from visual inspection. This is the digital equivalent of a specialized CIA tool to place covers over the english language text on U.S. produced weapons systems before giving them to insurgents secretly backed by the CIA. Marble forms part of the CIA's anti-forensics approach and the CIA's Core Library of malware code."