CWmike writes "The worm exploiting a critical Windows bug that Microsoft patched with an emergency fix in late October is now being used to build a fast-growing botnet, said Ivan Macalintal, a senior research engineer with Trend Micro. Dubbed 'Downad.a' by Trend (and 'Conficker.a' by Microsoft and 'Downadup' by Symantec), the worm is a key component in a massive new botnet that a new criminal element, not associated with McColo, is creating. 'We think 500,000 is a ballpark figure,' said Macalintal when asked the size of the new botnet. 'That's not as large as some, such as [the] Kraken [botnet], or Storm earlier, but it's... starting to grow.'"
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