(Bloomberg) -- Microsoft Corp., cybersecurity analysts, and Ukrainian police say the global hack that has disrupted companies across the globe can be traced to a Ukrainian accounting software producer called M.E.Doc.

The cybercrime unit of the Ukrainian police said late Tuesday that a software upgrade from M.E.Doc unwittingly contained the virus. Microsoft said in a blog post that the initial infection “appears to involve a software supply-chain threat involving the Ukrainian company M.E.Doc” and that it has evidence that some active infections started from the software maker’s updates.

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