Summary
A standalone malicious program which uses computer or removable drives 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:
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
AutoRun.GA creates a copy of itself as the following:
- C:\Program Files\Microsoft Common\wuauclt.exe
It will change the title of the process to "notepad window".
It also drops two files into the root of available removable drives:
- autorun.inf
- wuauclt.exe
It injects codes to svchost.exe and explorer.exe.
It looks for a service that will run manually and then temporarily replaces the driver with malicious driver. It then runs the service and the returns the original driver.
Launchpoint
- Key: HKLM\Software\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\explorer.exeValue: DebuggerData: C:\Program Files\Microsoft Common\wuauclt.exe
This entry is created for automatic execution when explorer.exe is launched.
The autorun.inf file is an autorun file of wuauclt.exe and contains the following strings:
- [autorun]open=system.exeshellexecute=system.exeshell\Explore\command=system.exeshell\Open\command=system.exeshell=Explore
Stealth
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.
File System Changes
Creates these files:
- C:\Program Files\Microsoft Common\wuauclt.exe
Process Changes
Writes in memory of these processes:
- svchost.exe
- explorer.exe
Network Connections
Attempts to connect to:
- http://aaszxt.ru/load4/[...].php?v=1&rs=%u&uid=1
- http://aaszxt.ru/load4/[...].php?v=1&id=%s&rs=%u&cc=0&uid=1
- http://aaszxt.ru/load4/[...].php?v=1&rs=%u&n=1&uid=1
- http://aaszxt.ru/load4/[...].php?v=1&id=%s&rs=%u&n=1&cc=0&uid=1
- http://aaszxr.ru/loadx/[...].php?v=1&rs=%u&uid=1
- http://aaszxr.ru/loadx/[...].php?v=1&id=%s&rs=%u&cc=0&uid=1
- http://aaszxr.ru/loadx/[...].php?v=1&rs=%u&n=1&uid=1
- http://aaszxr.ru/loadx/[...].php?v=1&id=%s&rs=%u&n=1&cc=0&uid=1
Registry Modifications
Sets these values:
- HKLM\Software\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\explorer.exeDebuggerC:\Program Files\Microsoft Common\wuauclt.exe
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