While collisions in MD5 hashes are nothing new, this most recent study by Wegner, Stevens, Lenstra (Article Link ) adds even more concern to the trustworthiness of an MD5 hash. If you can't trust a signed executable, what can you trust? I think nothing. Their technique however requires much premeditation. Its not as if you can create a collision on an existing executable. To be effective in a malicious way, it would require that you create two executables up front with the same hash. This is done by appending 832 bytes of useless data to the existing executables. As you can imagine, this would make it very easy for a criminal to create two versions of software, one with a backdoor, that have the exact same MD5 hash. Of course, it would be easy for them to get the good one signed and then create a download site with the malicious one. While this is somewhat sophisticated, i could definitely see this being utilized by the hack for money crews. It doesn't take much to get your software posted on some shareware download site. Also, I could see elite crews even trying to get drivers signed in this method. So what are we supposed to do about it? The authors of the paper suggest that SHA-1 is much more resistant to collisions and is a better alternative. Despite that, I think a search for a better hashing and signing algorithm get underway if it already hasn't. I don't think the threat is imminent by any means, but we will need something stronger in place within the next 2-3 years.
Unfortunately due to some back surgery I was not able to attend the SANS CTI summit this year, however I always try to take advantage of the great content SANS makes available. To help me out in synthesizing the information, I combined the context provided by those that were live tweeting which is useful when reviewing the slide decks. Hope you find this useful and well done @rickholland , @PDXbek , and @likethecoins , another great year of great content! Day 1 Secret Squirrels and Flashlights: Legal Risks and Threat Intelligence https://www.sans.org/cyber-security-summit/archives/file/summit-archive-1579535253.pdf @CristinGoodwin Assistant General Counsel for Customer Security and Trust, Microsoft Boundaries and strategies to help analysts identify and manage legal risks while hunting, investigating, and responding "Have a principled approach to sharing, so when the crisis comes you don’t have to panic.” "What we call common in #threatinel sharing is what a l
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