Backdoor:W32/Spyrat.D
Summary
A remote administration utility that bypasses normal security mechanisms to secretly control a program, computer or network.
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:
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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.
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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.
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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
The malware creates a dummy winlogon.exe process where it runs its malicious threads and drops the following copy:
- %appdata%\Winlogon\winlogon.exe
It also creates a legitimate winlogon.exe to %windir%\system32\install\Windows.exe.
Registry
The malware creates the following registry launch point:
- HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run %path_of_executed_file% = %appdata%\Winlogon\winlogon.exe
The following registry entries would also be created:
- HKEY_CURRENT_USER\Software\chuck norris FirstExecution = %date_time% NewIdentification = "chuck norris" NewGroup = 2
Backdoor Functionality
The malware is a reverse connection remote administration tool. It connects to chucknorris.zapto.org at port 150 to get its command.
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