Worm:W32/Gurong.A worm in emails and in Kazaa shared folders. It has a rootkit functionality.This worm appeared on the 21st of March 2006.
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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First check if your F-Secure security program is using the latest detection database 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.
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Submit a file or URL for further analysis.
After the worm's file is run, it copies itself to the Windows System folder as wmedia16.exe and creates a startup key value for this file in the registry.
The worm is able to hide the following items:
When the worm is active, it hides its own process, file and launch point in the registry.The worm installs a call gate through \Device\PhysicalMemory to execute part of its code in kernel mode (ring 0). The kernel-mode code replaces the following function pointers from the system service table:
This allows it to hide files, registry keys and values. In addition, the worm is able to modify kernel-mode process structures to hide any process it specifies.
Before spreading, the worm looks for email addresses in the victim's Windows Address Book (WAB) file and also in files with the following extensions:
The worm ignores email addresses that contains any of the following substrings:
The worm then constructs the email message used to deliver the worm's file by using the following "building blocks". The subject of the message can be one of the following:
The body text can be one of the following:
The infected attachment name can be any of the following:
Infected attachments can have the following extensions:
The worm spoofs (fakes) the sender's email address. The following user names are used to compose the fake sender's address:
The following domain names are used to compose the fake sender's address:
The worm copies itself to the shared folder of the peer-to-peer Kazaa client, with the following names:
The extensions of the copied files are randomly selected from the following variants:
Creates these keys: