Technical Information
To ensure autorun and distribution
Modifies the following registry keys
- [<HKLM>\SOFTWARE\Wow6432Node\Microsoft\Windows NT\CurrentVersion\Winlogon] 'Shell' = 'Explorer.exe winfiles.exe'
- [<HKCU>\Software\Microsoft\Windows\CurrentVersion\Run] 'Yahoo Messengger' = '%WINDIR%\SysWOW64\winfiles.exe'
- [<HKCU>\Software\Microsoft\Windows\CurrentVersion\Run] '41c871254570a1cced54213f6247ea78' = '"%APPDATA%\Skype.exe" ..'
- [<HKLM>\Software\Wow6432Node\Microsoft\Windows\CurrentVersion\Run] '41c871254570a1cced54213f6247ea78' = '"%APPDATA%\Skype.exe" ..'
Creates or modifies the following files
- %WINDIR%\tasks\at1.job
- <SYSTEM32>\tasks\at1
- %APPDATA%\microsoft\windows\start menu\programs\startup\41c871254570a1cced54213f6247ea78.exe
Creates the following files on removable media
- <Drive name for removable media>:\winfiles.exe
- <Drive name for removable media>:\autorun.inf
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)
- Registry Editor (RegEdit)
blocks the following features:
- System Restore (SR)
Executes the following
- '%WINDIR%\syswow64\at.exe' /delete /yes
- '%WINDIR%\syswow64\at.exe' 09:00 /interactive /EVERY:m,t,w,th,f,s,su %WINDIR%\SysWOW64\winfiles.exe
- '%WINDIR%\syswow64\netsh.exe' firewall add allowedprogram "%APPDATA%\Skype.exe" "Skype.exe" ENABLE
Injects code into
the following user processes:
- winnt.exe
Forces autoplay for removable media.
Modifies file system
Creates the following files
- %WINDIR%\syswow64\winfiles.exe
- %APPDATA%\microsoft\windows\cookies\low\index.dat
- <LS_APPDATA>\microsoft\windows\<INETFILES>\low\content.ie5\opx15eep\desktop.ini
- <LS_APPDATA>\microsoft\windows\<INETFILES>\low\content.ie5\2fx4wksu\desktop.ini
- <LS_APPDATA>\microsoft\windows\<INETFILES>\low\content.ie5\8z7azrht\desktop.ini
- <LS_APPDATA>\microsoft\windows\<INETFILES>\low\content.ie5\qajda0jb\desktop.ini
- <LS_APPDATA>\microsoft\windows\<INETFILES>\low\content.ie5\index.dat
- <LS_APPDATA>\microsoft\windows\history\low\history.ie5\index.dat
- <LS_APPDATA>\microsoft\windows\history\low\history.ie5\desktop.ini
- <LS_APPDATA>\microsoft\windows\<INETFILES>\low\content.ie5\desktop.ini
- <LS_APPDATA>\microsoft\windows\<INETFILES>\low\desktop.ini
- %WINDIR%\syswow64\autorun.ini
- %WINDIR%\winnt.exe
- %TEMP%\autc51c.tmp
- %WINDIR%\winfiles.exe
- <LS_APPDATA>\microsoft\windows\history\low\desktop.ini
- %APPDATA%\skype.exe
Sets the 'hidden' attribute to the following files
- %WINDIR%\syswow64\winfiles.exe
- %WINDIR%\winfiles.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\qajda0jb\desktop.ini
- <LS_APPDATA>\microsoft\windows\<INETFILES>\low\content.ie5\8z7azrht\desktop.ini
- <LS_APPDATA>\microsoft\windows\<INETFILES>\low\content.ie5\2fx4wksu\desktop.ini
- <LS_APPDATA>\microsoft\windows\<INETFILES>\low\content.ie5\opx15eep\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
Deletes the following files
- %TEMP%\autc51c.tmp
- <Drive name for removable media>:\winfiles.exe
- <Drive name for removable media>:\autorun.inf
Network activity
UDP
- DNS ASK nh#####nglane3.t35.com
- DNS ASK an####a.hopto.org
- DNS ASK nh#####nglane4.t35.com
Miscellaneous
Searches for the following windows
- ClassName: 'MS_AutodialMonitor' WindowName: ''
- ClassName: 'MS_WebCheckMonitor' WindowName: ''
Creates and executes the following
- '%WINDIR%\winnt.exe'
- '%APPDATA%\skype.exe'
- '%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 %WINDIR%\SysWOW64\winfiles.exe' (with hidden window)
- '%WINDIR%\syswow64\netsh.exe' firewall add allowedprogram "%APPDATA%\Skype.exe" "Skype.exe" ENABLE' (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 %WINDIR%\SysWOW64\winfiles.exe
- '%WINDIR%\syswow64\rundll32.exe' "%WINDIR%\syswow64\WININET.dll",DispatchAPICall 1
