Virus:W32/Drowor.A

Classification

Malware

Virus

W32

-

Summary

Drowor.A is a Windows file appending virus that infects executables in all drives found including network drives.

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.

Suspect a file is incorrectly detected (a False Positive)?

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.

Find out more

Knowledge Base

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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

Drowor.A is a Windows file appending virus that infects executables in all drives found including network drives.Upon execution, this virus checks to see if it is already running in memory by elevating its privileges and enumerating currently running processes on the affected machine.It then creates and executes a copy of itself as:

  • %windows%\system\internat.exe.

It drops a hidden copy of itself, setup.exe, in the root directory of discovered drives. This includes network drives. It creates an autorun.inf alongside of this setup.exe that may trigger and execute the file. It Infects by appending itself in Windows executables, adding a section named ".ice" in the infected files.Drowor.A creates a text file list of Windows executables in the discovered drives to a hard-coded path:

  • C:\WINDOWS\win.log

Drowor.A attempts to accesses a file from:

  • https://mm.21380.com/[Removed].txt

The URL is currently unavailable.