Summary
Trojan:W32/KillWin.AR is a trojan that disables certain features of the Operating System and copies itself to the startup folder. KillWin.AR outputs a message.
Removal
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 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.
Technical Details
Execution
Once KillWin.AR has been executed, it will delete the first four boot entries on the system. Here is an example of the boot entries:
KillWinn.AR also deletes the following system file:
- %sysdir\Hal.dll
This file is required in order to succesfully boot the operating system.
After which, it will drop the executed copy of itself in the startup folder.To execute its payload, the trojan creates a batch file, which is created in the following path:
- %temp%\bt[4 random numbers].bat
The file attribute is set to hidden.
Payload
As part of its payload it will show the following file message:
As a finale to its malicious act, it will shutdown the computer and sets its shutdown timeout to 1 second:
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