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.
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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: