Technical Information
To ensure autorun and distribution:
Modifies the following registry keys:
- [<HKLM>\SOFTWARE\Microsoft\Windows\CurrentVersion\Run] 'Symantec Drive Services' = 'symlssdr.exe'
Creates the following files on removable media:
- <Drive name for removable media>:\autorun.inf
- <Drive name for removable media>:\RECYCLER\S-1-6-21-1257894210-1075856346-012573477-3420\shellsrv.exe
- <Drive name for removable media>:\RECYCLER\S-1-6-21-1257894210-1075856346-012573477-3420\Desktop.ini
Malicious functions:
To complicate detection of its presence in the operating system,
blocks execution of the following system utilities:
- Command Prompt (CMD)
- Windows Task Manager (Taskmgr)
- Registry Editor (RegEdit)
blocks the following features:
- System Restore (SR)
Creates and executes the following:
- <SYSTEM32>\symlssdr.exe
Executes the following:
- <SYSTEM32>\ipconfig.exe /flushdns
Injects code into
the following system processes:
- %WINDIR%\Explorer.EXE
Terminates or attempts to terminate
the following user processes:
- MCAGENT.EXE
- GUARD.EXE
- fsav32.exe
- zlclient.exe
- spidernt.exe
- nod32.exe
- bdss.exe
- bdagent.exe
- 360tray.exe
- fsav.exe
- Drweb32w.exe
- ClamWin.exe
Searches for windows to
bypass different anti-viruses:
- ClassName: 'AVP.Tray' WindowName: ''
detect programs and games:
- ClassName: 'MSBLWindowClass' WindowName: ''
Modifies settings of Windows Explorer:
- [<HKCU>\Software\Microsoft\Windows\CurrentVersion\Policies\Explorer] 'NoRun' = '00000001'
- [<HKCU>\Software\Microsoft\Windows\CurrentVersion\Policies\Explorer] 'NoFolderOptions' = '00000001'
Hides the following processes:
- <SYSTEM32>\symlssdr.exe
Modifies file system :
Creates the following files:
- <SYSTEM32>\symlssdr.exe
Sets the 'hidden' attribute to the following files:
- <Drive name for removable media>:\RECYCLER\S-1-6-21-1257894210-1075856346-012573477-3420\shellsrv.exe
- <SYSTEM32>\symlssdr.exe
Network activity:
Connects to:
- '0x#####.#koreabeefimports.info':8081
UDP:
- DNS ASK 0x#####.#koreabeefimports.info
Miscellaneous:
Searches for the following windows:
- ClassName: 'Shell_TrayWnd' WindowName: ''
