Technical Information
To ensure autorun and distribution
Creates or modifies the following files
Malicious functions
Executes the following (exploit)
- '<SYSTEM32>\cmd.exe' /c attrib -S -h "%APPDATA%\Microsoft\Excel\XLSTART\K4.XLS"
- '<SYSTEM32>\cmd.exe' /c Del /F /Q "%APPDATA%\Microsoft\Excel\XLSTART\K4.XLS"
- '<SYSTEM32>\cmd.exe' /c RD /S /Q "%APPDATA%\Microsoft\Excel\XLSTART\K4.XLS"
- '%CommonProgramFiles%\Microsoft Shared\DW\DW20.EXE' -x -s 1416
Modifies file system
Creates the following files
- <Current directory>\39011000
- %TEMP%\1127450.cvr
Deletes the following files
- %APPDATA%\microsoft\excel\xlstart\k4.xls
Substitutes the following files
- <PATH_SAMPLE>.xls
Miscellaneous
Creates and executes the following
- '<SYSTEM32>\cmd.exe' /c attrib -S -h "%APPDATA%\Microsoft\Excel\XLSTART\K4.XLS"' (with hidden window)
- '<SYSTEM32>\cmd.exe' /c Del /F /Q "%APPDATA%\Microsoft\Excel\XLSTART\K4.XLS"' (with hidden window)
- '<SYSTEM32>\cmd.exe' /c RD /S /Q "%APPDATA%\Microsoft\Excel\XLSTART\K4.XLS"' (with hidden window)
Executes the following
- '<SYSTEM32>\attrib.exe' -S -h "%APPDATA%\Microsoft\Excel\XLSTART\K4.XLS"
