Technical Information
To ensure autorun and distribution
Creates or modifies the following files
- <SYSTEM32>\tasks\vscr
Malicious functions
Injects code into
the following user processes:
- vscr.exe
Modifies file system
Creates the following files
- %LOCALAPPDATA%\microsoft\clr_v4.0_32\usagelogs\<File name>.exe.log
- %APPDATA%\vscr.exe
- %TEMP%\tmp2900.tmp.bat
- nul
- %LOCALAPPDATA%\microsoft\clr_v4.0_32\usagelogs\vscr.exe.log
Miscellaneous
Creates and executes the following
- '%APPDATA%\vscr.exe'
Restarts the analyzed sample
Executes the following
- '%WINDIR%\syswow64\cmd.exe' /c schtasks /create /f /sc onlogon /rl highest /tn "vscr" /tr '"%APPDATA%\vscr.exe"' & exit
- '%WINDIR%\syswow64\cmd.exe' /c ""%TEMP%\tmp2900.tmp.bat""
- '%WINDIR%\syswow64\schtasks.exe' /create /f /sc onlogon /rl highest /tn "vscr" /tr '"%APPDATA%\vscr.exe"'
- '%WINDIR%\syswow64\timeout.exe' 3
- '%WINDIR%\syswow64\cmd.exe' /c schtasks /create /f /sc onlogon /rl highest /tn "vscr" /tr '"%APPDATA%\vscr.exe"' & exit' (with hidden window)
