Worm:W32/AutoRun.NOI
Summary
A standalone malicious program which uses computer or network resources to make complete copies of itself.
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
Worm.Win32.AutoRun.noi creates a copy of itself as the following:
- C:\Program Files\Microsoft Common\wuauclt.exe
It creates the following registry key:
- HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\explorer.exeDebugger = "%ProgramFiles%\Microsoft Common\wuauclt.exe
Note: The key is created for automatic execution when explorer.exe is launched.
It also drops two files into the root of available removable drives:
- autorun.inf
- system.exe
It then injects codes to explorer.exe.
The autorun.inf file is an autorun file of system.exe and contains the following strings:
- [autorun]open=system.exeshellexecute=system.exeshell\Explore\command=system.exeshell\Open\command=system.exeshell=Explore
Worm.Win32.AutoRun.noi attempts to retrieve information from:
- http://druzg.ru/[...].php?v=1&rs=13441600&n=1&uid=1
- http://drizg.ru/[...].php?v=1&rs=13441600&n=1&uid=1
The worm uses rootkit stealth techniques to hide its presence on the infected machine, including deleting its own installation file once the installation has been completed.
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