Ginwui is a fully featured backdoor with rootkit characteristics. This backdoor is distributed inside a Word document file with shell-code that drops the backdoor's file to the hard drive and activates it.
Based on the settings of your F-Secure security product, it will either automatically delete, quarantine or rename the detected program or file, or ask you for a desired action.
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The shell-code in the Word document decrypts and drops the backdoor's file as CSRSE.EXE to the system's temporary folder and activates it.
After being run, the dropped file in its turn extracts and drops another file to the system. This file is dropped as WINGUIS.DLL to Windows System folder and its DoHook function is activated by the dropper. The dropper then deletes itself from the system.
The dropped DLL file is the main backdoor component. It traps several functions and modifies information that is passed to the user. As a result, the backdoor's file, startup key in the Registry, and process are not visible to the user.
The backdoor creates a startup key for its file in the Registry:
where %WinSysDir% represents the Windows System folder that by default has the name C:\Windows\System32\.
When active, the backdoor connects to a specified address in order to receive commands from a hacker. The backdoor allows the hacker to do any of the following on an infected computer:
The backdoor also creates three empty SYS files in the \drivers\ subfolder of Windows System folder.
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