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Worm:W32/Autorun.KD

First posted on 26 November 2008.
Source: SecurityHome

Aliases :

There are no other names known for Worm:W32/Autorun.KD.

Explanation :

A standalone malicious program which uses computer or network resources to make complete copies of itself. May include code or other malware to damage both the system and the network.

right]Autorun.KD is delivered as a spam e-mail attachment, using the attachment name of "abrechnung.zip".

The zip file contains two files: abrechnung.lnk and scann.a. The former is a Windows Shortcut and the latter is a copy of the malware.

Execution

Running the abrechnung.lnk file will execute scann.a, the actual malware file. The worm will create the directory %programfiles%Microsoft Common, then create a copy of itself as %programfiles%Microsoft Commonsvchost.exe and delete the original scann.a file.

The worm will then use http://www.microsoft.com to check for the presence of a usable Internet connection and will then attempt to connect to two additional websites, using information on the infected machine as parameters. The websites connected to may respond with further download locations, or additional instructions for the malware.

Registry

On execution, the worm will create a registry entry that allows it to execute whenever explorer.exe is launched.

Propagation

Autorun.KD can spread via Windows autorun feature and by copying itself onto other drive media:

• [autorun]
  open=system.exe
  shellexecute=system.exe
  shellOpencommand=system.exe
  shell=Explore

Last update 26 November 2008

 

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