Zimuse is a family of worms that performs destructive overwrite of the Master Boot Record of disk drives on the infected system.
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Zimuse.A arrives on the system either as a standalone file (possibly from a malicious download or email) or by infected removable devices (e.g., USB sticks).
When executed, it will display a fake WinZip dialog box (see image below). This dialog box is a sham. Regardless of the user's subsequent interaction, the worm has already infected the system.
The following file operations will be performed on the system:
Uses registry launchpoints to ensure its components run or are loaded as services on every startup (see below).
Creates these keys:
Sets these values:
After a certain time period from the initial infection, the worm will infect removable drives inserted into the system by dropping a copy of itself named zipsetup.exe and an autorun.inf file as show below:
[autorun] shellexecute=zipsetup.exe /H
After a further period of dormancy, the worm will trigger its payload, which overwrites the Master Boot Record of available drives on the system, and effectively crippling the file system and rendering data on the disk inaccessible except with specialist tools. The following dialog box will be displayed:
On next boot the system will be unbootable.
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