F-Secure
Tools
Worm:W32/Autorun.KD
| Name : | Worm:W32/Autorun.KD |
| Detection Names : |
Worm:W32/Autorun.KD Worm.Win32.Autorun.svl |
| Category: | Malware |
| Type: | Worm |
| Platform: | W32 |
Summary
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.
Details
File System Changes
Create these directories:
• %programfiles%\Microsoft Common
Network Connections
Attempts to connect to:
• http://univnext.cn/[...].php?
• http://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
Debugger = "C:\Program Files\Microsoft Common\svchost.exe
Additional Details
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 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:
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 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
open=system.exe
shellexecute=system.exe
shell\Open\command=system.exe
shell=Explore