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"While tools have existed for individual users, this is the only free tool -- and the most comprehensive one -- available for enterprises like federal and state government and private sector networks to determine the extent to which their systems are infected by this worm," said US-CERT director Mischel Kwon.
"Our experts at US-CERT are working around the clock to increase our capabilities to address the cyber risk to our nation's critical networks and systems, both from this threat and all others," he added.
The worm is suspected to have infected millions of computers running the Windows operating system and Windows maker Microsoft has offered a $250,000 bounty for those responsible for the worm.
US-CERT recommended that Windows users apply Microsoft security patch MS08-067 to help provide protection against the worm.
The patch is designed to prevent an attacker from remotely taking control of an infected computer system and installing additional malicious software.
Malware could be triggered to steal data, generate spam attacks or turn control of infected computers over to hackers amassing "zombie" machines into "botnet" armies.
The worm is programmed to modify itself on Wednesday, April Fool's Day, according to computer security specialists.
Conficker had been programmed to reach out to 250 websites daily to download commands from its masters, they said, but on Wednesday it will begin connecting with 50,000 websites daily for instructions.
The hackers behind the worm have yet to give it any specific orders.
"That's the interesting thing. The only thing the worm is being asked to do is to ask for further instructions," Steve Trilling, vice president of security firm Symantec, told the CBS program "60 Minutes" in a story aired on Sunday.
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