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Trojan.MulDrop5.6240

Added to the Dr.Web virus database: 2013-12-24

Virus description added:

Technical Information

To ensure autorun and distribution:
Modifies the following registry keys:
  • [<HKLM>\SOFTWARE\Microsoft\Windows\CurrentVersion\RunOnce] '' = ''
  • [<HKLM>\SOFTWARE\Microsoft\Windows\CurrentVersion\RunOnce] 'GrpConv' = 'grpconv -o'
  • [<HKLM>\SOFTWARE\Classes\MSProgramGroup\Shell\Open\Command] '' = '<SYSTEM32>\grpconv.exe %1'
  • [<HKLM>\SOFTWARE\Classes\cmdfile\shell\open\command] '' = '"%1" %*'
  • [<HKLM>\SOFTWARE\Classes\comfile\shell\open\command] '' = '"%1" %*'
  • [<HKLM>\SOFTWARE\Classes\exefile\shell\open\command] '' = '"%1" %*'
  • [<HKLM>\SOFTWARE\Classes\batfile\shell\open\command] '' = '"%1" %*'
Malicious functions:
To complicate detection of its presence in the operating system,
blocks the following features:
  • System Restore (SR)
Creates and executes the following:
  • 'C:\32788R22FWJFW\grep.cfexe' -F "5.2." OsVer
  • 'C:\32788R22FWJFW\pv.cfexe' -kf n.com
  • 'C:\32788R22FWJFW\swreg.exe' QUERY "HKLM\SYSTEM\CURRENTCONTROLSET\CONTROL\PRODUCTOPTIONS" /v ProductType
  • 'C:\32788R22FWJFW\grep.cfexe' -F "5.1.2" OsVer
  • 'C:\32788R22FWJFW\pev.exe' uzip "32788R22FWJFW\License\pv_5_2_2.zip" "32788R22FWJFW\License"
  • '<SYSTEM32>\cmd.execf' /c 32788R22FWJFW\prep.cmd >\Bug.txt 2>&1
  • 'C:\32788R22FWJFW\pv.exe' -kf n.com
  • '<SYSTEM32>\cmd.execf' /c 32788R22FWJFW\prep.cmd
  • 'C:\32788R22FWJFW\grep.cfexe' -isq "ProductType.*WinNT" WinNT00
  • 'C:\32788R22FWJFW\pev.cfexe' -rtf --c:##5# .\* and { License.exe or 32788R22FWJFW.exe or OsVer.exe or WinNT.exe or N_.exe }
  • 'C:\32788R22FWJFW\n.com' win close ititle "ComboFix"
  • 'C:\32788R22FWJFW\pev.cfexe' -tf --files:files.pif --c:##5#b#f#
  • 'C:\32788R22FWJFW\pev.cfexe' -rtf -md554463D66BF8F932DEA4D9354873FC471 .\md5sum.pif
  • 'C:\32788R22FWJFW\pev.exe' -rtf -s+901 .\OriPath00
  • 'C:\32788R22FWJFW\sed.cfexe' "/^PATH=/I!d; s///; s/\x22//g" Oripath
  • 'C:\32788R22FWJFW\n.com' win close class "#32770"
  • 'C:\32788R22FWJFW\pv.cfexe' -kf runonce.exe grpconv.exe procmon.exe
  • 'C:\32788R22FWJFW\swreg.exe' acl "HKLM\SOFTWARE\Microsoft\Command Processor" /reset /q
  • 'C:\32788R22FWJFW\hidec.exe' 32788R22FWJFW\swreg.exe import 32788R22FWJFW\EXE.reg
  • 'C:\32788R22FWJFW\n.com' exec hide 32788R22FWJFW\SWREG.exe acl "hklm\software\microsoft\windows nt\currentversion\windows" /O Guest /Q
  • 'C:\32788R22FWJFW\swreg.exe' import 32788R22FWJFW\EXE.reg
  • 'C:\32788R22FWJFW\hidec.exe' 32788R22FWJFW\swreg.exe acl "HKLM\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Drivers32" /da:r /q
  • 'C:\32788R22FWJFW\n.com' shexec install 32788R22FWJFW\Prep.inf
  • 'C:\32788R22FWJFW\swreg.exe' acl "HKLM\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Drivers32" /da:r /q
  • 'C:\32788R22FWJFW\hidec.exe' 32788R22FWJFW\swreg.exe acl "HKLM\SOFTWARE\Microsoft\Command Processor" /reset /q
  • 'C:\32788R22FWJFW\swreg.exe' acl "hklm\software\microsoft\windows nt\currentversion\windows" /O Guest /Q
  • 'C:\32788R22FWJFW\n.com' cmdwait 1000 exec hide "~$folder.system$\cmd.execf" /c 32788R22FWJFW\prep.cmd >\Bug.txt 2>&1
  • 'C:\32788R22FWJFW\gsar.cfexe' -if -s\:000M:000i:000c:000r:000o -r\:001M:000i:000c:000r:000o "<SYSTEM32>\cmd.exe" "<SYSTEM32>\cmd.execf"
  • 'C:\32788R22FWJFW\swreg.exe' acl "HKLM\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Drivers32" /reset /q
  • 'C:\32788R22FWJFW\n.com' cmdwait 2500 exec hide "~$folder.system$\cmd.execf" /c 32788R22FWJFW\prep.cmd
  • 'C:\32788R22FWJFW\n.com' cmdwait 3000 exec hide 32788R22FWJFW\swreg.exe acl "HKLM\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Drivers32" /reset /q
  • 'C:\32788R22FWJFW\n.com' cmdwait 150 exec hide 32788R22FWJFW\SWREG.exe acl "hklm\software\microsoft\windows nt\currentversion\windows" /DE:F /Q
  • 'C:\32788R22FWJFW\n.com' exec hide 32788R22FWJFW\GSAR.cfexe -if -s\:000M:000i:000c:000r:000o -r\:001M:000i:000c:000r:000o "~$folder.system$\cmd.exe" "~$folder.system$\cmd.execf"
  • 'C:\32788R22FWJFW\swreg.exe' acl "hklm\software\microsoft\windows nt\currentversion\windows" /DE:F /Q
Executes the following:
  • '<SYSTEM32>\grpconv.exe' -o
  • '<SYSTEM32>\runonce.exe' -r
  • '<SYSTEM32>\rundll32.exe' setupapi,InstallHinfSection DefaultInstall 132 C:\32788R22FWJFW\Prep.inf
Modifies file system :
Creates the following files:
  • C:\32788R22FWJFW\rogues.dat
  • C:\32788R22FWJFW\region.dat
  • C:\32788R22FWJFW\safeboot.def.dat
  • C:\32788R22FWJFW\safeboot.dat
  • C:\32788R22FWJFW\RCLink.dat
  • C:\32788R22FWJFW\NetworkService.dat
  • C:\32788R22FWJFW\netsvc.xp.dat
  • C:\32788R22FWJFW\Purity.dat
  • C:\32788R22FWJFW\Policies.dat
  • C:\32788R22FWJFW\w2kreg.dat
  • C:\32788R22FWJFW\vistareg.dat
  • C:\32788R22FWJFW\zDomain.dat
  • C:\32788R22FWJFW\xpreg.dat
  • C:\32788R22FWJFW\system_ini.dat
  • C:\32788R22FWJFW\svc_wht.dat
  • C:\32788R22FWJFW\safeboot.def.vista.dat
  • C:\32788R22FWJFW\svchost.vista.dat
  • C:\32788R22FWJFW\svchost.dat
  • C:\32788R22FWJFW\023.dat
  • C:\32788R22FWJFW\NirCmd.chm
  • C:\32788R22FWJFW\Creg.dat
  • C:\32788R22FWJFW\023v.dat
  • C:\32788R22FWJFW\zip.cfexe
  • C:\32788R22FWJFW\swsc.cfexe
  • C:\32788R22FWJFW\setpath.cfexe
  • C:\32788R22FWJFW\tail.cfexe
  • C:\32788R22FWJFW\swxcacls.cfexe
  • C:\32788R22FWJFW\netsvc.bad.dat
  • C:\32788R22FWJFW\ndis_combofix.dat
  • C:\32788R22FWJFW\netsvc.vista.dat
  • C:\32788R22FWJFW\netsvc.dat
  • C:\32788R22FWJFW\LocalSystemNetworkRestricted.dat
  • C:\32788R22FWJFW\Fin.dat
  • C:\32788R22FWJFW\CregC.dat
  • C:\32788R22FWJFW\LocalServiceNetworkRestricted.dat
  • C:\32788R22FWJFW\LocalService.dat
  • C:\32788R22FWJFW\zhsvc.dat
  • C:\32788R22FWJFW\License\streamtools.zip
  • C:\32788R22FWJFW\License\pv_5_2_2.zip
  • C:\Bug.txt
  • <SYSTEM32>\cmd.execf
  • C:\32788R22FWJFW\image001.gif
  • C:\32788R22FWJFW\restore_pt.vbs
  • C:\32788R22FWJFW\OSid.vbs
  • C:\32788R22FWJFW\Wmi_rem.vbs
  • C:\32788R22FWJFW\SvcDrv.vbs
  • C:\32788R22FWJFW\OriPath
  • C:\32788R22FWJFW\WinNT00
  • C:\32788R22FWJFW\mdCheck00.dat
  • C:\32788R22FWJFW\OriPath00
  • C:\32788R22FWJFW\OsVer
  • C:\32788R22FWJFW\License\pv.txt
  • C:\32788R22FWJFW\License\pv.exe
  • C:\32788R22FWJFW\Nircmd.com
  • C:\32788R22FWJFW\pev.cfexe
  • C:\32788R22FWJFW\md5sum.pif
  • C:\32788R22FWJFW\files.pif
  • C:\32788R22FWJFW\Exe.reg
  • C:\32788R22FWJFW\md5sum00.pif
  • C:\32788R22FWJFW\srizbi.md5
  • C:\32788R22FWJFW\ERDNTDOS.LOC
  • C:\32788R22FWJFW\ERDNT.e_e
  • C:\32788R22FWJFW\ERUNT.LOC
  • C:\32788R22FWJFW\ERDNTWIN.LOC
  • C:\32788R22FWJFW\DPF.str
  • C:\32788R22FWJFW\toolbar.sed
  • C:\32788R22FWJFW\lnkread.vbs
  • C:\32788R22FWJFW\av.vbs
  • C:\32788R22FWJFW\run2.sed
  • C:\32788R22FWJFW\embedded.sed
  • C:\32788R22FWJFW\ddsDo.sed
  • C:\32788R22FWJFW\RegDo.sed
  • C:\32788R22FWJFW\REGDACL.sed
  • C:\32788R22FWJFW\sed.cfexe
  • C:\32788R22FWJFW\SetEnvmt.bat
  • C:\32788R22FWJFW\SafeBootRepair.bat
  • C:\32788R22FWJFW\Auto-RC.cmd
  • C:\32788R22FWJFW\Assoc.cmd
  • C:\32788R22FWJFW\RestoreO4.bat
  • C:\32788R22FWJFW\List.bat
  • C:\32788R22FWJFW\List-D.bat
  • C:\32788R22FWJFW\ND_.bat
  • C:\32788R22FWJFW\MoveIt.bat
  • C:\32788R22FWJFW\CregC.cmd
  • C:\32788R22FWJFW\Create.cmd
  • C:\32788R22FWJFW\FD-SV.cmd
  • C:\32788R22FWJFW\CSet.cmd
  • C:\32788R22FWJFW\CF-Script.cmd
  • C:\32788R22FWJFW\AWF.cmd
  • C:\32788R22FWJFW\av.cmd
  • C:\32788R22FWJFW\Catch-sub.cmd
  • C:\32788R22FWJFW\Boot-Rk.cmd
  • C:\32788R22FWJFW\License\UnxUtilsDist.html
  • C:\32788R22FWJFW\License\Zip - license.txt
  • C:\32788R22FWJFW\c.bat
  • C:\32788R22FWJFW\Boot.bat
  • C:\32788R22FWJFW\License\mtee.txt.txt
  • C:\32788R22FWJFW\License\dumphive-license.txt
  • C:\32788R22FWJFW\License\Curl - license.txt
  • C:\32788R22FWJFW\License\FI - license.txt
  • C:\32788R22FWJFW\License\EXTRACT.TXT
  • C:\32788R22FWJFW\Lang.bat
  • C:\32788R22FWJFW\Kollect.bat
  • C:\32788R22FWJFW\List-C.bat
  • C:\32788R22FWJFW\List-B.bat
  • C:\32788R22FWJFW\history.bat
  • C:\32788R22FWJFW\DelClsid.bat
  • C:\32788R22FWJFW\Combobatch.bat
  • C:\32788R22FWJFW\FIXLSP.bat
  • C:\32788R22FWJFW\FIND3M.bat
  • C:\32788R22FWJFW\FKMGen.cmd
  • C:\32788R22FWJFW\ComboFix-Download.cfexe
  • C:\32788R22FWJFW\catchme.cfexe
  • C:\32788R22FWJFW\dumphive.cfexe
  • C:\32788R22FWJFW\dd.cfexe
  • C:\32788R22FWJFW\appinit.bad
  • C:\32788R22FWJFW\BootSect.dll
  • C:\32788R22FWJFW\swreg.exe
  • C:\32788R22FWJFW\Combo-Fix.sys
  • C:\32788R22FWJFW\ffdefstr.dll
  • C:\32788R22FWJFW\mtee.cfexe
  • C:\32788R22FWJFW\moveex.cfexe
  • C:\32788R22FWJFW\NirCmdC.cfexe
  • C:\32788R22FWJFW\NirCmd.cfexe
  • C:\32788R22FWJFW\handle.cfexe
  • C:\32788R22FWJFW\extract.cfexe
  • C:\32788R22FWJFW\ERUNT.cfexe
  • C:\32788R22FWJFW\gsar.cfexe
  • C:\32788R22FWJFW\grep.cfexe
  • C:\32788R22FWJFW\RegScan.cmd
  • C:\32788R22FWJFW\Prep.cmd
  • C:\32788R22FWJFW\SnapShot.cmd
  • C:\32788R22FWJFW\Rkey.cmd
  • C:\32788R22FWJFW\NT-OS.cmd
  • C:\32788R22FWJFW\Install-RC.cmd
  • C:\32788R22FWJFW\GetHive.cmd
  • C:\32788R22FWJFW\Kill-All.cmd
  • C:\32788R22FWJFW\katch.cmd
  • C:\32788R22FWJFW\n.com
  • C:\32788R22FWJFW\Prep.inf
  • C:\32788R22FWJFW\pev.exe
  • C:\32788R22FWJFW\hidec.exe
  • C:\32788R22FWJFW\clsid.c
  • C:\32788R22FWJFW\SuppScan.cmd
  • C:\32788R22FWJFW\SRestore.cmd
  • C:\32788R22FWJFW\badclsid.c
  • C:\32788R22FWJFW\Update-CF.cmd
Deletes the following files:
  • C:\32788R22FWJFW\OriPath
  • C:\32788R22FWJFW\OriPath00
  • C:\32788R22FWJFW\WinNT00
  • C:\32788R22FWJFW\md5sum00.pif
Moves the following files:
  • from C:\32788R22FWJFW\pv.exe to C:\32788R22FWJFW\pv.cfexe
  • from C:\32788R22FWJFW\License\pv.exe to C:\32788R22FWJFW\pv.exe
Miscellaneous:
Searches for the following windows:
  • ClassName: 'Shell_TrayWnd' WindowName: '(null)'
  • ClassName: 'EDIT' WindowName: '(null)'

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.
  2. If you cannot boot the OS, change the BIOS settings to boot your system from a CD or USB drive. Download the image of the emergency system repair disk Dr.Web® LiveDisk , mount it on a USB drive or burn it to a CD/DVD. After booting up with this media, run a full scan and cure all the detected threats.
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  1. If the mobile device is operating normally, download and install Dr.Web for Android. Run a full system scan and follow recommendations to neutralize the detected threats.
  2. If the mobile device has been locked by Android.Locker ransomware (the message on the screen tells you that you have broken some law or demands a set ransom amount; or you will see some other announcement that prevents you from using the handheld normally), do the following:
    • 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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