Discovered: November 21, 2008
Updated: November 24, 2008 9:37:07 AM
Also Known As: Win32/Conficker.A [Computer Associates], W32/Downadup.A [F-Secure], Conficker.A [Panda Software], Net-Worm.Win32.Kido.bt [Kaspersky], WORM_DOWNAD.AP [Trend], W32/Conficker [Norman]
Type: Worm
Infection Length: 62,976 bytes
Systems Affected: Windows 2000, Windows 95, Windows 98, Windows Me, Windows NT, Windows Server 2003, Windows Vista, Windows XP
W32.Downadup is a worm that spreads by exploiting the
Microsoft Windows Server Service RPC Handling Remote Code Execution Vulnerability (BID 31874).
Note: After reviewing W32.Downadup, Symantec recommends reviewing details of
W32.Downadup.B and
W32.Downadup!autorun as well.
For more information, please read the following: Protection
-
Initial Rapid Release version November 21, 2008 revision 052
-
Latest Rapid Release version August 13, 2009 revision 032
-
Initial Daily Certified version November 22, 2008 revision 003
-
Latest Daily Certified version August 14, 2009 revision 004
-
Initial Weekly Certified release date November 26, 2008
Click for a more detailed description of Rapid Release and Daily Certified virus definitions.
Threat Assessment
Wild
-
Wild Level: Medium
-
Number of Infections: 1000+
-
Number of Sites: 10+
-
Geographical Distribution: Medium
-
Threat Containment: Moderate
-
Removal: Moderate
Damage
-
Damage Level: Medium
-
Payload: Downloads other files on to the compromised computer.
-
Degrades Performance: Downloading remote files may degrade network performance.
Distribution
-
Distribution Level: Medium
-
Target of Infection: Exploits a certain vulnerability.
Writeup By: Takayoshi Nakayama and Sean Kiernan