Backdoor:W32/Bifrose.SN
Summary
Bifrose.SN is a variant of the Bifrose family of backdoors.
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
Installation to the System
When run, Bifrose.SN copies itself under %SysDir% directory using the name winampxp.exe. It installs the following registry key to make sure it will be executed next time the system is started:
- [HKLM\Software\Microsoft\Windows\CurrentVersion\Run]"startkey" = "winampxp.exe"
Backdoor Functions
After the installation, Bifrose.SN tries to locate a web browser and inject code into it. The injected code is the actual backdoor. The backdoor starts to communicate with the following servers using a specially crafted HTTP queries:
- bfrost.gardenparadise.co.uk:4444
- zingg.no-ip.org:4444
- zingg2.no-ip.org:4444
The servers can instruct the backdoor to execute the following actions:
- Basic file operations (copy, delete, rename, find, execute)
- Download/upload files
- Process operations (list, kill)
- Registry operations (create/delete keys/values)
- Create screenshots of the desktop
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