Sysinternals (now Microsoft) Updates File Signature Check Utility "sigcheck"
Looks like the Sysinternals team over at Microsoft has updated their "file signature checking tool". This tool can be used to verify hashes on files and presence of unsigned files on a Windows system. This can be a potentail tool for finding Malware on a system, as most instances of this bad software isn't likely to be signed.
Get the update at: http://technet.microsoft.com/en-us/sysinternals/bb897441.aspx

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