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.
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.
A False Positive is when a file is incorrectly detected as harmful, usually because its code or behavior resembles known harmful programs. A False Positive will usually be fixed in a subsequent database update without any action needed on your part. If you wish, you may also:
Check for the latest database updates
First check if your F-Secure security program is using the latest detection database updates, then try scanning the file again.
Submit a sample
After checking, if you still believe the file is incorrectly detected, you can submit a sample of it for re-analysis.
NOTE If the file was moved to quarantine, you need to collect the file from quarantine before you can submit it.
Exclude a file from further scanning
If you are certain that the file is safe and want to continue using it, you can exclude it from further scanning by the F-Secure security product.
Note You need administrative rights to change the settings.
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.
On execution, the worm will create a registry entry that allows it to execute whenever explorer.exe is launched.
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
Create these directories:
Attempts to connect to:
Creates these keys: