Downadup uses several different methods to spread. These include using the recently patched vulnerability in Windows Server Service, guessing network passwords and infecting USB sticks. As an end result, once the malware gains access to the inside of a corporate network, it can be unusually hard to eradicate fully.
Typical problems generated by the worm include locking network users out of their accounts. This happens because the worm tries to guess (or brute-force) network passwords, tripping the automatic lock-out of a user who has too many password failures.
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