W32.Netsky.O@mm

W32.Netsky.O@mm is a mass-mailing worm that uses its own SMTP engine to send itself to the email addresses it finds when scanning the hard drives and mapped drives. The "sender" of the email is spoofed, and its subject line and message body of the email vary.

The attachment is one of the following:

• readme.pif
• document.pif
• data.pif
• details.pif
• msg.pif
• message.pif

This threat is compressed with UPX.

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Note:

• Symantec Consumer products that support Worm Blocking functionality automatically detect this threat as it attempts to spread.
• The worm executable has a static MD5 hash value of 0x9D7006E30FDF15E9C8E03E62534B3A3E

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Protection

• Initial Rapid Release version March 17, 2004
• Latest Rapid Release version August 20, 2008 revision 017
• Initial Daily Certified version March 17, 2004
• Latest Daily Certified version January 20, 2009 revision 048
• Initial Weekly Certified release date March 17, 2004

Click here for a more detailed description of Rapid Release and Daily Certified virus definitions.

Threat Assessment

Wild

• Wild Level: Low
• Number of Infections: 0 - 49
• Number of Sites: 0 - 2
• Geographical Distribution: Low
• Threat Containment: Easy
• Removal: Moderate

Damage

• Damage Level: Low

Distribution

• Distribution Level: High