Worm:Win32/Taterf.gen!A is a worm that spreads via mapped drives in order to steal login and account details for popular online games.
When executed, Taterf copies itself to the system directory as a hidden file using one of the following file names:
The registry is modified to run the copy at each Windows start (for example):
Adds value: "amva" With data: "<system folder>\amvo<number>.exe" To subkey: HKCU\Software\Microsoft\Windows\CurrentVersion\Run
Adds value: "avpa" With data: "<system folder>\avpo<number>.exe" To subkey: HKCU\Software\Microsoft\Windows\CurrentVersion\Run
Note: Filenames and registry modifications differ according to variant.
The functionality to perform Taterf's password-stealing payload is contained in a dll component which is also dropped to the system directory using one of the following file names:
<random 7 or 8 letter name>.dll
Where <number> may be omitted entirely, or be a numeral from 0-9.
Once dropped, the dll is injected into explorer.exe or iexplore.exe.
It should be noted, that in order to evade detection, the authors of this family may pack the worm's executable. In cases such as these, the worm may be detected with the following names:
A driver with a randomly generated file name may also be dropped in the %temp% directory depending on which packer is used. This driver is detected as either VirTool:WinNT/Vanti.A or VirTool:WinNT/Vanti.B. The above mentioned dlls may also be written to the %temp% directory when these packers are used.
The worm continually enumerates drives from C- Z, copying itself to the root of the drive, and creating an 'autorun.inf' file. The autorun.inf is used to execute the worm whenever the drive is viewed with Windows Explorer. This file is detected as Worm:Win32/Taterf!inf.
The name that the worm uses to copy itself to in the root of the drive differs across variants, however, it usually consists of random letters and numbers with a '.com', 'cmd' or an '.exe' extension.