Trojan:W32/KillWin.AR

Classification

Category :

Malware

Type :

Trojan

Aliases :

Trojan:W32/KillWin.AR, Trojan.bat.killwin

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: