Worm:W32/Autorun.KD

Classification

Malware

Worm

W32

Worm.Win32.Autorun.svl

Summary

Autorun.KD is delivered as a spam email 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.

Removal

Automatic action

Based on the settings of your F-Secure security product, it will either move the file to the quarantine where it cannot spread or cause harm, or remove it.

Find out more

Knowledge Base

Find the latest advice in our Community Knowledge Base.

User Guide

See the user guide for your product on the Help Center.

Contact Support

Chat with or call an expert for help.

Submit a sample

Submit a file or URL for further analysis.

Technical Details

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 Common\svchost.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 shell\Open\command=system.exe shell=Explore
 

File System Changes

Create these directories:

  • %programfiles%\Microsoft Common

Network Connections

Attempts to connect to:

  • https://univnext.cn/[...].php?
  • https://cjusbciw123.com/[...].php?

Registry Modifications

Creates these keys:

  • HKEY_LOCAL_MACHINE\Software\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\explorer.exe Debugger = "C:\Program Files\Microsoft Common\svchost.exe

Date Created: 2008-11-25 08:01:23.0

Date Last Modified: 2008-11-25 12:11:40.0