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Trojan.DownLoader30.26753

Added to the Dr.Web virus database: 2019-10-10

Virus description added:

Technical Information

To ensure autorun and distribution
Creates or modifies the following files
  • <SYSTEM32>\tasks\system
  • <SYSTEM32>\tasks\dns
  • <SYSTEM32>\tasks\skycmd
Malicious functions
Downloads and executes
  • http://sb####g.f3322.net/cget.exe as cget.exe
Executes the following
  • '%WINDIR%\syswow64\taskkill.exe' -f /im svshost.exe
  • '%WINDIR%\syswow64\taskkill.exe' -f /im svshosb.exe
Modifies file system
Creates the following files
  • %WINDIR%\debug\system\skycmd.bat
  • %WINDIR%\debug\system\start.bat
  • %WINDIR%\debug\system\start2.bat
  • %WINDIR%\debug\system\down.bat
  • %WINDIR%\debug\system\hosts
  • %WINDIR%\debug\system\install3.bat
  • %WINDIR%\debug\system\open.bat
  • %WINDIR%\debug\system\qc.bat
  • %PROGRAMDATA%\microsoft\test\down.bat
  • %PROGRAMDATA%\microsoft\test\open.bat
  • %PROGRAMDATA%\microsoft\test\hosts
  • nul
Sets the 'hidden' attribute to the following files
  • %PROGRAMDATA%\microsoft\test\down.bat
  • %PROGRAMDATA%\microsoft\test\hosts
  • %PROGRAMDATA%\microsoft\test\open.bat
Network activity
UDP
  • DNS ASK sb####g.f3322.net
Miscellaneous
Searches for the following windows
  • ClassName: 'EDIT' WindowName: ''
  • ClassName: '' WindowName: ''
  • ClassName: 'MS_AutodialMonitor' WindowName: ''
  • ClassName: 'MS_WebCheckMonitor' WindowName: ''
Creates and executes the following
  • '%WINDIR%\syswow64\cmd.exe' /c ""%WINDIR%\debug\SYSTEM\install3.bat" h"' (with hidden window)
Executes the following
  • '%WINDIR%\syswow64\cmd.exe' /c ""%WINDIR%\debug\SYSTEM\start.bat" "
  • '%WINDIR%\syswow64\netsh.exe' ipsec static add filteraction name=deny action=block
  • '%WINDIR%\syswow64\netsh.exe' ipsec static add filteraction name=Allow action=permit
  • '%WINDIR%\syswow64\netsh.exe' ipsec static add filter filterlist=denylist srcaddr=any dstaddr=me description=not protocol=tcp mirrored=yes dstport=445
  • '%WINDIR%\syswow64\netsh.exe' ipsec static add filter filterlist=denylist srcaddr=any dstaddr=me description=not protocol=tcp mirrored=yes dstport=139
  • '%WINDIR%\syswow64\netsh.exe' ipsec static add filter filterlist=denylist srcaddr=any dstaddr=me description=not protocol=tcp mirrored=yes dstport=138
  • '%WINDIR%\syswow64\netsh.exe' ipsec static add filter filterlist=denylist srcaddr=any dstaddr=me description=not protocol=tcp mirrored=yes dstport=137
  • '%WINDIR%\syswow64\netsh.exe' ipsec static add filter filterlist=denylist srcaddr=any dstaddr=me description=not protocol=tcp mirrored=yes dstport=135
  • '%WINDIR%\syswow64\netsh.exe' ipsec static add filterlist name=denylist
  • '%WINDIR%\syswow64\netsh.exe' ipsec static add filterlist name=Allowlist
  • '%WINDIR%\syswow64\netsh.exe' ipsec static add policy name=win
  • '%WINDIR%\syswow64\sc.exe' QUERY FTPUPDATE
  • '%WINDIR%\syswow64\cmd.exe' /c ""%WINDIR%\debug\SYSTEM\install3.bat" h"
  • '%WINDIR%\syswow64\mshta.exe' vbscript:createobject("wscript.shell").run("""install3.bat"" h",0)(window.close)
  • '%WINDIR%\syswow64\attrib.exe' +S +H %WINDIR%\debug\SYSTEM
  • '%WINDIR%\syswow64\cmd.exe' /K start2.bat
  • '%WINDIR%\syswow64\attrib.exe' +S +H %PROGRAMDATA%\Microsoft\test\open.bat
  • '%WINDIR%\syswow64\attrib.exe' +S +H %PROGRAMDATA%\Microsoft\test\down.bat
  • '%WINDIR%\syswow64\attrib.exe' +S +H %WINDIR%\Tasks\hook
  • '%WINDIR%\syswow64\attrib.exe' +S +H %PROGRAMDATA%\Microsoft\test\*
  • '%WINDIR%\syswow64\attrib.exe' +S +H %PROGRAMDATA%\Microsoft\test
  • '%WINDIR%\syswow64\schtasks.exe' /F /create /ru system /sc HOURLY /mo 23 /tn skycmd /tr %PROGRAMDATA%\Microsoft\test\skycmd.bat
  • '%WINDIR%\syswow64\schtasks.exe' /F /create /ru system /sc HOURLY /mo 1 /tn DNS /tr %PROGRAMDATA%\Microsoft\test\open.bat
  • '%WINDIR%\syswow64\schtasks.exe' /F /create /ru system /sc HOURLY /mo 12 /tn SYSTEM /tr %PROGRAMDATA%\Microsoft\test\down.bat
  • '%WINDIR%\syswow64\attrib.exe' -S -H %WINDIR%\debug\SYSTEM\*
  • '%WINDIR%\syswow64\attrib.exe' -S -H %PROGRAMDATA%\Microsoft\test\*
  • '%WINDIR%\syswow64\netsh.exe' interface ip set dns ▒╛╡╪┴Вј╜╙3 static 114.114.114.114
  • '%WINDIR%\syswow64\netsh.exe' interface ip set dns ▒╛╡╪┴Вј╜╙2 static 114.114.114.114
  • '%WINDIR%\syswow64\netsh.exe' interface ip set dns ▒╛╡╪┴Вј╜╙1 static 114.114.114.114
  • '%WINDIR%\syswow64\netsh.exe' interface ip set dns ▒╛╡╪┴Вј╜╙ static 114.114.114.114
  • '%WINDIR%\syswow64\netsh.exe' ipsec static add rule name=deny1 policy=win filterlist=denylist filteraction=deny
  • '%WINDIR%\syswow64\netsh.exe' ipsec static set policy name=win assign=y

Curing recommendations

  1. If the operating system (OS) can be loaded (either normally or in safe mode), download Dr.Web Security Space and run a full scan of your computer and removable media you use. More about Dr.Web Security Space.
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    • Load your smartphone or tablet in the safe mode (depending on the operating system version and specifications of the particular mobile device involved, this procedure can be performed in various ways; seek clarification from the user guide that was shipped with the device, or contact its manufacturer);
    • Once you have activated safe mode, install the Dr.Web for Android onto the infected handheld and run a full scan of the system; follow the steps recommended for neutralizing the threats that have been detected;
    • Switch off your device and turn it on as normal.

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