Technical Information
To ensure autorun and distribution
Creates or modifies the following files
- <SYSTEM32>\tasks\windowsupdateservice
Modifies file system
Creates the following files
- %LOCALAPPDATA%\74f3bd041a.exe
- %LOCALAPPDATA%\microsoft\clr_v4.0\usagelogs\<File name>.exe.log
- %APPDATA%\windowsupdateservice.exe
- %TEMP%\tmpb4a6.tmp.bat
- %LOCALAPPDATA%\microsoft\clr_v4.0_32\usagelogs\74f3bd041a.exe.log
- nul
Sets the 'hidden' attribute to the following files
- %LOCALAPPDATA%\74f3bd041a.exe
Network activity
Connects to
- 'localhost':3006
- 'localhost':36345
UDP
- DNS ASK ja#######63-36345.portmap.host
Miscellaneous
Creates and executes the following
- '%LOCALAPPDATA%\74f3bd041a.exe'
- '%APPDATA%\windowsupdateservice.exe'
Executes the following
- '%WINDIR%\syswow64\cmd.exe' /c schtasks /create /f /sc onlogon /rl highest /tn "WindowsUpdateService" /tr '"%APPDATA%\WindowsUpdateService.exe"' & exit
- '%WINDIR%\syswow64\cmd.exe' /c ""%TEMP%\tmpB4A6.tmp.bat""
- '%WINDIR%\syswow64\schtasks.exe' /create /f /sc onlogon /rl highest /tn "WindowsUpdateService" /tr '"%APPDATA%\WindowsUpdateService.exe"'
- '%WINDIR%\syswow64\timeout.exe' 3
- '%WINDIR%\syswow64\cmd.exe' /c schtasks /create /f /sc onlogon /rl highest /tn "WindowsUpdateService" /tr '"%APPDATA%\WindowsUpdateService.exe"' & exit' (with hidden window)
