Beware "Conficker worm" DAngErOus!!!!!

星期一, 5月 04, 2009



Conficker Worm Targets Microsoft Windows Systems
Original release date: March 29, 2009
Last revised: April 09, 2009
Source: US-CERT

Systems Affected

* Microsoft Windows


Overview

US-CERT is aware of public reports indicating a widespread infection of the Conficker/Downadup worm, which can infect a Microsoft Windows system from a thumb drive, a network share, or directly across a corporate network, if the network servers are not patched with the MS08-067 patch from Microsoft.

Researchers have discovered a new variant of the Conficker Worm on April 9, 2009. This variant updates earlier infections via its peer to peer (P2P) network as well as resuming scan-and-infect activity against unpatched systems. Public reporting indicates that this variant attempts to download additional malicious code onto victim systems, possibly including copies of the Waledac Trojan, a spam-oriented malicious application which has previously propagated only via bogus email messages containing malicious links.

I. Description

Home users can apply a simple test for the presence of a Conficker/Downadup infection on their home computers. The presence of a Conficker/Downadup infection may be detected if a user is unable to surf to their security solution website or if they are unable to connect to the websites, by downloading detection/removal tools available free from those sites:

* http://www.symantec.com/norton/theme.jsp?themeid=conficker_worm&inid=us_ghp_link_conficker_worm
* http://www.microsoft.com/protect/computer/viruses/worms/conficker.mspx
* http://www.mcafee.com

If a user is unable to reach any of these websites, it may indicate a Conficker/Downadup infection. The most recent variant of Conficker/Downadup interferes with queries for these sites, preventing a user from visiting them. If a Conficker/Downadup infection is suspected, the system or computer should be removed from the network or unplugged from the Internet - in the case for home users.

II. Impact

A remote, unauthenticated attacker could execute arbitrary code on a vulnerable system.

III. Solution

Instructions, support and more information on how to manually remove a Conficker/Downadup infection from a system have been published by major security vendors. Please see below for a few of those sites. Each of these vendors offers free tools that can verify the presence of a Conficker/Downadup infection and remove the worm:

Symantec:

http://www.symantec.com/business/security_response/writeup.jsp?docid=2009-011316-0247-99

Microsoft:

http://support.microsoft.com/kb/962007

http://www.microsoft.com/protect/computer/viruses/worms/conficker.mspx

Microsoft PC Safety hotline at 1-866-PCSAFETY, for assistance.


US-CERT encourages users to take the following preventative measures to help prevent a Conficker/Downadup infection:

* Ensure all systems have the MS08-067 patch.
* Disable AutoRun functionality. See US-CERT Technical Cyber Security Alert TA09-020A.
* Maintain up-to-date antivirus software.
* Do not follow unsolicited links and do not open unsolicited email messages.
* Use caution when visiting untrusted websites.
* Use caution when downloading and installing applications.
* Obtain software applications and updates directly from the vendor's website.
* Refer to the Recognizing and Avoiding Email Scams (pdf) document for more information on avoiding email scams.
* Refer to the Avoiding Social Engineering and Phishing Attacks document for more information on social engineering attacks.


More information please click this link

http://sophiebenben.blogspot.com/2009/05/beware-conficker-worm-dangerous.html

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