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Cross-Platform Hash Comparison to Detect Ransomware - Backup Software Hole?
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<blockquote data-quote="MacDefender" data-source="post: 978116" data-attributes="member: 83059"><p>As others have pointed out, the biggest flaw with this is that you are going to be asking the host OS for the contents of the files in order to compute a hash of them. If, in theory, this kind of malware is transparently encrypting and decrypting your data for you, it will probably do the same for your verification software so you won’t know the underlying files are encrypted. </p><p></p><p>BitLocker and other legitimate encryption software also will make an offline version of this difficult to achieve. </p><p></p><p>Not to mention, what about files that are actually meant to change? Nobody has all static documents, otherwise you might as well burn the contents to a physically read only disc and fire all your employees. How will such software determine what changes are and aren’t allowed?</p><p></p><p>Existing ransomware protection is already robust in terms of it being basically impossible to access or change a file in Windows without it triggering an antivirus API hook informing you. The weakness is that often times malware hides as a legitimate app, for example, using Excel macros to encrypt your spreadsheets so that to anti malware it looks like a legitimate user modifying spreadsheets</p></blockquote><p></p>
[QUOTE="MacDefender, post: 978116, member: 83059"] As others have pointed out, the biggest flaw with this is that you are going to be asking the host OS for the contents of the files in order to compute a hash of them. If, in theory, this kind of malware is transparently encrypting and decrypting your data for you, it will probably do the same for your verification software so you won’t know the underlying files are encrypted. BitLocker and other legitimate encryption software also will make an offline version of this difficult to achieve. Not to mention, what about files that are actually meant to change? Nobody has all static documents, otherwise you might as well burn the contents to a physically read only disc and fire all your employees. How will such software determine what changes are and aren’t allowed? Existing ransomware protection is already robust in terms of it being basically impossible to access or change a file in Windows without it triggering an antivirus API hook informing you. The weakness is that often times malware hides as a legitimate app, for example, using Excel macros to encrypt your spreadsheets so that to anti malware it looks like a legitimate user modifying spreadsheets [/QUOTE]
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