Technical Information
To ensure autorun and distribution
Modifies the following registry keys
- [<HKLM>\SOFTWARE\Wow6432Node\Microsoft\Windows NT\CurrentVersion\Winlogon] 'Shell' = 'Explorer.exe SSVICHOSST.exe'
- [<HKCU>\Software\Microsoft\Windows\CurrentVersion\Run] 'Yahoo Messengger' = '<SYSTEM32>\SSVICHOSST.exe'
Creates or modifies the following files
- %WINDIR%\tasks\at1.job
- <SYSTEM32>\tasks\at1
Creates the following files on removable media
- <Drive name for removable media>:\new folder.exe
- <Drive name for removable media>:\ssvichosst.exe
- <Drive name for removable media>:\autorun.inf
Malicious functions
To complicate detection of its presence in the operating system,
blocks execution of the following system utilities:
- Windows Task Manager (Taskmgr)
- Registry Editor (RegEdit)
modifies the following system settings:
- [<HKCU>\Software\Microsoft\Windows\CurrentVersion\Policies\Explorer] 'NofolderOptions' = '00000001'
Executes the following
- '%WINDIR%\syswow64\at.exe' /delete /yes
- '%WINDIR%\syswow64\at.exe' 09:00 /interactive /EVERY:m,t,w,th,f,s,su <SYSTEM32>\SSVICHOSST.exe
Modifies file system
Creates the following files
- %WINDIR%\syswow64\ssvichosst.exe
- %WINDIR%\ssvichosst.exe
- %WINDIR%\syswow64\autorun.ini
- <LS_APPDATA>\microsoft\windows\<INETFILES>\low\desktop.ini
- <LS_APPDATA>\microsoft\windows\<INETFILES>\low\content.ie5\desktop.ini
- <LS_APPDATA>\microsoft\windows\history\low\desktop.ini
- <LS_APPDATA>\microsoft\windows\history\low\history.ie5\desktop.ini
- <LS_APPDATA>\microsoft\windows\<INETFILES>\low\content.ie5\index.dat
- <LS_APPDATA>\microsoft\windows\<INETFILES>\low\content.ie5\hd5xu3he\desktop.ini
- <LS_APPDATA>\microsoft\windows\<INETFILES>\low\content.ie5\gg213bbf\desktop.ini
- <LS_APPDATA>\microsoft\windows\<INETFILES>\low\content.ie5\ejcurt4s\desktop.ini
- <LS_APPDATA>\microsoft\windows\<INETFILES>\low\content.ie5\z7l1091w\desktop.ini
- %APPDATA%\microsoft\windows\cookies\low\index.dat
- <LS_APPDATA>\microsoft\windows\history\low\history.ie5\index.dat
Sets the 'hidden' attribute to the following files
- %WINDIR%\syswow64\ssvichosst.exe
- %WINDIR%\syswow64\autorun.ini
- <LS_APPDATA>\microsoft\windows\<INETFILES>\low\desktop.ini
- <LS_APPDATA>\microsoft\windows\<INETFILES>\low\content.ie5\desktop.ini
- <LS_APPDATA>\microsoft\windows\<INETFILES>\low\content.ie5\hd5xu3he\desktop.ini
- <LS_APPDATA>\microsoft\windows\<INETFILES>\low\content.ie5\gg213bbf\desktop.ini
- <LS_APPDATA>\microsoft\windows\<INETFILES>\low\content.ie5\ejcurt4s\desktop.ini
- <LS_APPDATA>\microsoft\windows\<INETFILES>\low\content.ie5\z7l1091w\desktop.ini
- <LS_APPDATA>\microsoft\windows\history\low\history.ie5\desktop.ini
- <LS_APPDATA>\microsoft\windows\history\low\desktop.ini
- <Drive name for removable media>:\autorun.inf
Network activity
UDP
- DNS ASK nh#####nglan3.t35.com
- DNS ASK nh#####nglan4.t35.com
Miscellaneous
Creates and executes the following
- '%WINDIR%\syswow64\cmd.exe' /C AT /delete /yes' (with hidden window)
- '%WINDIR%\syswow64\cmd.exe' /C AT 09:00 /interactive /EVERY:m,t,w,th,f,s,su <SYSTEM32>\SSVICHOSST.exe' (with hidden window)
Executes the following
- '%WINDIR%\syswow64\cmd.exe' /C AT /delete /yes
- '%WINDIR%\syswow64\cmd.exe' /C AT 09:00 /interactive /EVERY:m,t,w,th,f,s,su <SYSTEM32>\SSVICHOSST.exe
- '%WINDIR%\syswow64\rundll32.exe' "%WINDIR%\syswow64\Wininet.dll",DispatchAPICall 1
