Technical Information
To ensure autorun and distribution:
Modifies the following registry keys:
- [<HKCU>\Software\Microsoft\Windows NT\CurrentVersion\Windows] 'run' = '<SYSTEM32>\sapwudtho\winlogon.exe'
- [<HKCU>\Software\Microsoft\Windows NT\CurrentVersion\Windows] 'load' = '<SYSTEM32>\sapwudtho\winlogon.exe'
- [<HKCU>\Software\Microsoft\Windows\CurrentVersion\Run] 'winlogon' = ''
- [<HKLM>\SOFTWARE\Classes\regfile\shell\open\command] '' = '"%1"'
- [<HKLM>\SOFTWARE\Microsoft\Windows\CurrentVersion\Run] 'winlogon' = ''
Creates or modifies the following files:
- %HOMEPATH%\Start Menu\Programs\Startup\winlogon.lnk
Malicious functions:
To complicate detection of its presence in the operating system,
forces the system hide from view:
- hidden files
blocks the following features:
- System Restore (SR)
Creates and executes the following:
- <SYSTEM32>\sapwudtho\winlogon.exe
Executes the following:
- <SYSTEM32>\net1.exe stop "wscsvc"
- <SYSTEM32>\net.exe stop "srservice"
- <SYSTEM32>\sc.exe config "srservice" start= disabled
- <SYSTEM32>\net1.exe stop "srservice"
- <SYSTEM32>\net1.exe stop "SharedAccess"
- <SYSTEM32>\sc.exe config "SharedAccess" start= disabled
- <SYSTEM32>\ping.exe 1.1.1.1 -n 1 -w 5000
- <SYSTEM32>\cmd.exe /c %TEMP%\del2.bat
- <SYSTEM32>\net.exe stop "wscsvc"
- <SYSTEM32>\net.exe stop "SharedAccess"
- <SYSTEM32>\sc.exe config "wscsvc" start= disabled
Terminates or attempts to terminate
the following user processes:
- zlclient.exe
- smc.exe
- outpost.exe
Searches for registry branches where third party applications store passwords:
- [<HKCU>\Software\Microsoft\MessengerService]
Modifies file system :
Creates the following files:
- <SYSTEM32>\netstat.com
- <SYSTEM32>\taskkill.com
- <SYSTEM32>\sapwudtho\winlogon.ini
- <SYSTEM32>\sapwudtho\winlogon.exe
- %TEMP%\del2.bat
Sets the 'hidden' attribute to the following files:
- <SYSTEM32>\taskkill.com
- %HOMEPATH%\Start Menu\Programs\Startup\winlogon.lnk
- <SYSTEM32>\sapwudtho\winlogon.exe
- <SYSTEM32>\netstat.com
Deletes the following files:
- <SYSTEM32>\Restore\MachineGuid.txt
- <DRIVERS>\etc\hosts
- <SYSTEM32>\sapwudtho\winlogon.ini
Substitutes the HOSTS file.
Deletes itself.
Miscellaneous:
Searches for the following windows:
- ClassName: 'Indicator' WindowName: ''
- ClassName: 'Shell_TrayWnd' WindowName: ''
