Technical Information
To ensure autorun and distribution
Modifies the following registry keys
- [<HKLM>\SOFTWARE\Wow6432Node\Microsoft\Windows NT\CurrentVersion\Winlogon] 'Shell' = 'Explorer.exe SCVHSOT.exe'
- [<HKCU>\Software\Microsoft\Windows\CurrentVersion\Run] 'Yahoo Messengger' = '<SYSTEM32>\SCVHSOT.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>:\scvhsot.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>\blastclnnn.exe
Modifies file system
Creates the following files
- %WINDIR%\syswow64\scvhsot.exe
- %LOCALAPPDATA%\microsoft\windows\history\low\history.ie5\index.dat
- %APPDATA%\microsoft\windows\cookies\low\index.dat
- %LOCALAPPDATA%\microsoft\windows\<INETFILES>\low\content.ie5\e8a6jofe\desktop.ini
- %LOCALAPPDATA%\microsoft\windows\<INETFILES>\low\content.ie5\3ly79pez\desktop.ini
- %LOCALAPPDATA%\microsoft\windows\<INETFILES>\low\content.ie5\knesnaui\desktop.ini
- %LOCALAPPDATA%\microsoft\windows\<INETFILES>\low\content.ie5\b4m3zpzb\desktop.ini
- %LOCALAPPDATA%\microsoft\windows\<INETFILES>\low\content.ie5\index.dat
- %LOCALAPPDATA%\microsoft\windows\history\low\history.ie5\desktop.ini
- %LOCALAPPDATA%\microsoft\windows\history\low\desktop.ini
- %LOCALAPPDATA%\microsoft\windows\<INETFILES>\low\content.ie5\desktop.ini
- %LOCALAPPDATA%\microsoft\windows\<INETFILES>\low\desktop.ini
- %WINDIR%\syswow64\autorun.ini
- %WINDIR%\syswow64\blastclnnn.exe
- %WINDIR%\scvhsot.exe
- %WINDIR%\hinhem.scr
- %WINDIR%\serviceprofiles\networkservice\appdata\locallow\microsoft\cryptneturlcache\metadata\f0accf77cdcbff39f6191887f6d2d357
- %WINDIR%\serviceprofiles\networkservice\appdata\locallow\microsoft\cryptneturlcache\content\f0accf77cdcbff39f6191887f6d2d357
Sets the 'hidden' attribute to the following files
- %WINDIR%\syswow64\scvhsot.exe
- %WINDIR%\syswow64\blastclnnn.exe
- %WINDIR%\syswow64\autorun.ini
- %LOCALAPPDATA%\microsoft\windows\<INETFILES>\low\desktop.ini
- %LOCALAPPDATA%\microsoft\windows\<INETFILES>\low\content.ie5\desktop.ini
- %LOCALAPPDATA%\microsoft\windows\<INETFILES>\low\content.ie5\b4m3zpzb\desktop.ini
- %LOCALAPPDATA%\microsoft\windows\<INETFILES>\low\content.ie5\knesnaui\desktop.ini
- %LOCALAPPDATA%\microsoft\windows\<INETFILES>\low\content.ie5\3ly79pez\desktop.ini
- %LOCALAPPDATA%\microsoft\windows\<INETFILES>\low\content.ie5\e8a6jofe\desktop.ini
- %LOCALAPPDATA%\microsoft\windows\history\low\history.ie5\desktop.ini
- %LOCALAPPDATA%\microsoft\windows\history\low\desktop.ini
- <Drive name for removable media>:\autorun.inf
Network activity
TCP
HTTP GET requests
- http://www.fr###ebs.com/setting3/setting.doc
- http://www.fr###ebs.com/setting3/setting.xls
- http://www.microsoft.com/pki/certs/MicRooCerAut_2010-06-23.crt
UDP
- DNS ASK se#####3.yeahost.com
- DNS ASK se####g3.9999mb.com
- DNS ASK fr###ebs.com
- DNS ASK microsoft.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>\blastclnnn.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>\blastclnnn.exe
- '%WINDIR%\syswow64\rundll32.exe' "%WINDIR%\syswow64\wininet.dll",DispatchAPICall 1
