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Since Friday morning the response team is being flooded with calls seeking information on the virus and protection to be taken against it, but no actual cases of infection have been so far reported.

"The mass mailing worm called Nyxem with aliases such as Kama Sutra, Blackmal, MyWife, Grew and its variants are spreading very fast infecting large number of computers running Microsoft Windows," CERT said.

The destructive payload of this worm activates on every third day of the month and it is expected to strike for the first time today, on February 3, 2006.

The worm is activated when an infected mail is opened. After the strike, it deletes the Microsoft and Adobe files. It also sends itself to the addresses in the mail book of the infected computer.

The file formats that are infected the most are DOC, XLS, MDB, MDE, PPT, PPS, ZIP, RAR, PDF, PSD and DMP. While the well- known e-mail service providers have an updated anti-virus software to take care of the worm, the internal e-mail systems of organisations that did not have effective anti-virus systems, were at risk, CERT said.

It has advised computer users to update anti-virus software regularly, block emails with the subjects and attachments mentioned above at the email gateway level, exercise caution while opening email attachments, block unknown file types at the email gateway, backup all important data files and apply appropriate security updates at OS and application level.

Meanwhile, in a media note Gulshan Rai, Director, Indian Computer Emergency Response Team (CERT In), says:

To detect and protect your data from the Win32/Mywife.e@mm, also known as Black Worm or Kama Sutra worm, Indian Computer Emergency Response Team (CERT In) advises all users to visit the Protect Your PC Web site (www.protectyourpc.com).

CERT In has also advised all computer users to use caution with unknown file attachments to follow the guidelines of allowing a firewall, getting software updates, and installing anti-virus software at http://www.cert-in.org.in/virus/nyxem_e-worm.htm.

Win32/Mywife.e@mm is a mass-mailing network worm that targets certain software. The worm spreads through e-mail attachments and shared network drives. It is expected to corrupt the content of specific files on the third day of every month, starting February 3, 2006.

As with all currently known variant of the Mywife malware, this variant does not exploit any secutrity vulnerability, but is dependent on the user opening an infected file attachment. The virus has been accorded a medium rating in terms of transmission and moderate rating for recovery. However, it does not have a high damage rating.

As D-Day for the 'Kama Sutra' worm nears, security firm Sophos is
warning users not to panic over the threat posed by it.

The W32/Nyxem-D worm, which can pose as pictures of the Kama Sutra, has a destructive payload, which triggers half an hour after a computer is booted on the third day of any month, destroying DOC, XLS, MDB, MDE, PPT, PPS, ZIP, RAR, PDF, PSD and DMP files by replacing their contents with the phrase:

DATA Error [47 0F 94 93 F4 K5]

Nyxem-D worm is also known as Blackworm, Email-Worm.Win32.VB.bi, Win32/Mywife.e or W32.Blackmal.E@mm. "When you panic, you make mistakes," said Graham Cluley, senior technology consultant for Sophos. "Sit down, have a cup of tea, and work out if you have done everything you should have done to ensure your computer isn't at risk from the Nyxem worm, and indeed any of the other 120,000 pieces of malware in existence."

The W32/Nyxem-D Windows worm does not infect Macintosh computers and experts believe that home users may be at more risk than businesses because typically they take security issues less seriously.

"Most businesses have been successfully protecting against this worm for a couple of weeks," said Cluley. "Home users who have not been updating their software may be at risk if they are in the habit of opening unsolicited attachments in emails with dodgy sounding subject lines. Even if they are infected, and do nothing, and the worm demolishes their data on Friday, they should be able to recover if they have a recent backup. Anyone who suffers from this worm's payload simply hasn't been practicing safe computing."

Sophos warns that focusing too much on Nyxem's threat on Friday 3
February may leave people unaware of other malware risks.

DATA Error [47 0F 94 93 F4 K5] , if you get this error in doc/ xls file ,then data recovery is possible. Please send hard disk to our LAB.

"The damage caused by W32/Nyxem-D has stirred up the public interest because it sounds really terrible - but in many ways, it is the less visible malicious payloads delivered by other malware which can be far worse," said Cluley. "You may be able to recover the files deleted by Nyxem by going to backup or retyping the content. But you can never get back files which a hacker stole from your PC using a backdoor Trojan. You can never untype keystrokes which were captured by a keylogger. You can never unsend the thousands of emails spammed out if your computer is a zombie."

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