Technical Information
To ensure autorun and distribution:
Modifies the following registry keys:
- [<HKLM>\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon] 'Userinit' = '<SYSTEM32>\userinit.exe,<SYSTEM32>\wuauclt.exe,'
Creates or modifies the following files:
- %HOMEPATH%\Start Menu\Programs\Startup\wuauclt.exe.lnk
Infects the following executable system files:
- <SYSTEM32>\sndrec32.exe
- <SYSTEM32>\sndvol32.exe
- <SYSTEM32>\taskmgr.exe
- <SYSTEM32>\mspaint.exe
- <SYSTEM32>\wuauclt.exe
- <SYSTEM32>\calc.exe
- <SYSTEM32>\notepad.exe
Malicious functions:
To complicate detection of its presence in the operating system,
blocks the following features:
- System File Checker (SFC)
Executes the following:
- <SYSTEM32>\wuauclt.exe
Modifies file system :
Creates the following files:
- %TEMP%\RCXA.tmp
- %TEMP%\wuaB.tmp
- %TEMP%\RCX8.tmp
- %TEMP%\wua9.tmp
- %TEMP%\RCXE.tmp
- %TEMP%\wuaF.tmp
- %TEMP%\RCXC.tmp
- %TEMP%\wuaD.tmp
- <SYSTEM32>\wuauclt.ini
- %TEMP%\wua3.tmp
- %TEMP%\wua1.tmp
- %TEMP%\RCX2.tmp
- %TEMP%\RCX6.tmp
- %TEMP%\wua7.tmp
- %TEMP%\RCX4.tmp
- %TEMP%\wua5.tmp
Deletes the following files:
- %TEMP%\wua9.tmp
- %TEMP%\wuaB.tmp
- %TEMP%\wuaD.tmp
- %TEMP%\wua7.tmp
- %TEMP%\wua1.tmp
- %TEMP%\wua3.tmp
- %TEMP%\wua5.tmp
Network activity:
Connects to:
- 'www.up#######crosoft-windows.com':80
TCP:
HTTP GET requests:
- www.up#######crosoft-windows.com/software/updater/version_checker.php?gu################################################################################################
UDP:
- DNS ASK www.up#######crosoft-windows.com
