Technical Information
To ensure autorun and distribution:
Modifies the following registry keys:
- [<HKLM>\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\egui.exe] 'Debugger' = 'svchost.exe'
- [<HKLM>\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\ekrn.exe] 'Debugger' = 'svchost.exe'
- [<HKCU>\Software\Microsoft\Windows NT\CurrentVersion\Winlogon] 'Shell' = '%APPDATA%\olslhl.exe'
- [<HKLM>\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\msmpeng.exe] 'Debugger' = 'svchost.exe'
- [<HKLM>\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\msseces.exe] 'Debugger' = 'svchost.exe'
- [<HKLM>\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\msascui.exe] 'Debugger' = 'svchost.exe'
Malicious functions:
To complicate detection of its presence in the operating system,
blocks the following features:
- System Restore (SR)
Creates and executes the following:
- '%APPDATA%\olslhl.exe'
Executes the following:
- '<SYSTEM32>\sc.exe' config WinDefend start= disabled
- '<SYSTEM32>\sc.exe' stop WinDefend
Terminates or attempts to terminate
the following system processes:
- <SYSTEM32>\cmd.exe
the following user processes:
- ecmd.exe
Modifies file system :
Creates the following files:
- %APPDATA%\olslhl.exe
Deletes itself.
Miscellaneous:
Searches for the following windows:
- ClassName: 'Shell_TrayWnd' WindowName: '(null)'
