Summary
Goldun.CW is a trojan downloader that attempts to secretly download and execute a file from a malicious website.
See the Details section for more information.
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
Goldun.CW comes as an FSG packed EXE file. It creates and opens the following Bitmap file to hide its original intent:
Note: This image is saved in the default Temporary folder as screen.bmp.
Goldun.CW drops the following UPX-compressed DLL file on Windows System folder:
- %systemdir%\mscods.dll
Note: %systemdir% by default is C:\Windows\system32.
The DLL file is installed as a Browser Helper Object (BHO) so that when ever an Internet Explorer session is started, the DLL will also execute. It does this by creating the following Registry keys:
- [HKCR\CLSID\{45357971-2534-8760-3685-423479197575}]
- [HKLM\SOFTWARE\Classes\CLSID\{45357971-2534-8760-3685-423479197575}]
The DLL will connect, download, and execute the file from the following URL:
- https://everythingdiscounted.biz/store/images/extras/[REMOVED].jpg
The said URL is ecncrypted on the malware's body using a simple XOR routine.
It then drops a file named vbrs.bat into the default Temporary folder in order to delete the EXE file and the BAT file itself. This is done just to clean up some of the disorder created.
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