Trojan.MulDrop5.5798

Technical Information

To ensure autorun and distribution:

Modifies the following registry keys:

[<HKLM>\SOFTWARE\Microsoft\Windows\CurrentVersion\RunOnce] 'GrpConv' = 'grpconv -o'
[<HKLM>\SOFTWARE\Classes\MSProgramGroup\Shell\Open\Command] '' = '<SYSTEM32>\grpconv.exe %1'
[<HKLM>\SOFTWARE\Microsoft\Windows\CurrentVersion\RunOnce] '' = ''
[<HKLM>\SOFTWARE\Classes\comfile\shell\open\command] '' = '"%1" %*'
[<HKLM>\SOFTWARE\Classes\exefile\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:\<Virus name>\grep.cfexe' -q "0C$"
'<SYSTEM32>\CF15548.exe' /S /D /c" echo.0409"
'C:\<Virus name>\mtee.cfexe' NlsLang
'C:\<Virus name>\grep.cfexe' -q "0B$"
'C:\<Virus name>\grep.cfexe' -q "07$"
'C:\<Virus name>\grep.cfexe' -q "13$"
'<SYSTEM32>\CF15548.exe' /S /D /c" SET pathext 2>nul"
'C:\<Virus name>\grep.cfexe' -Fqi ".CFEXE;"
'<SYSTEM32>\CF15548.exe' /S /D /c" echo..cfexe;.COM;.EXE;.BAT;.CMD;.VBS;.VBE;.JS;.JSE;.WSF;.WSH"
'C:\<Virus name>\swreg.cfexe' query "hklm\system\currentcontrolset\control\nls\language" /v installlanguage
'C:\<Virus name>\sed.cfexe' "/.*\t/!d; s///"
'C:\<Virus name>\swreg.cfexe' query "hklm\system\currentcontrolset\control\nls\codepage" /v acp
'C:\<Virus name>\grep.cfexe' -q "16$"
'C:\<Virus name>\sed.cfexe' -R "/-/!d;s/.* (\d{4})-(\d\d)-(\d\d) .*/(\1*365+\2*30+\3)/;s/\+0/\+/g"
'C:\<Virus name>\vfind.cfexe' -ltf kmd.dat c.bat
'C:\<Virus name>\grep.cfexe' -Fisq "/u" sfx.cmd
'C:\<Virus name>\nircmd.com' qboxcom "Current date is Thu 12/12/2013. ComboFix has expired~n~nClick 'Yes' to run in REDUCED FUNCTIONALITY mode~n~nClick 'No' to exit" "Version_08-07-30.02" returnval 1
'C:\<Virus name>\sed.cfexe' "N;s/\n/-/;s/^/@set \/a sum=&/"
'<SYSTEM32>\CF15548.exe' /S /D /c" 1>sum.bat ( sed "N;s/\n/-/;s/^/@set \/a sum=&/" )"
'C:\<Virus name>\grep.cfexe' -q "0A$"
'C:\<Virus name>\grep.cfexe' -q "10$"
'C:\<Virus name>\grep.cfexe' -q "04$"
'C:\<Virus name>\grep.cfexe' -Fsq \ ForeignA.dat
'C:\<Virus name>\sed.cfexe' -r "/\.dll\t$/I!d; s/.*([a-z]:\\.*)\t.*/\1/I; /detoured\.dll/Id"
'C:\<Virus name>\pv.cfexe' -m CF15548.exe -q -e
'C:\<Virus name>\grep.cfexe' -Fisq "Microsoft Windows XP"
'C:\327882R2FWJFW\attrib.cfexe' +r "C:\327882R2FWJFW\*.com"
'C:\327882R2FWJFW\attrib.cfexe' +r "C:\327882R2FWJFW\*.cfexe"
'C:\327882R2FWJFW\swreg.cfexe' add "hklm\software\microsoft\windows\currentversion\app paths\combofix.exe" /ve /d "<Full path to virus>"
'C:\327882R2FWJFW\grep.cfexe' -Gisqx "FileName=[-[:alnum:]@.]*" FileName
'C:\327882R2FWJFW\swxcacls.cfexe' "<SYSTEM32>\cmd.exe" /p /ga:f /gs:f /gp:x /gu:x /q
'C:\327882R2FWJFW\swxcacls.cfexe' "<SYSTEM32>\cmd.exe" /oa /Q
'C:\327882R2FWJFW\pv.cfexe' -o"%i\t%l"
'C:\327882R2FWJFW\nircmd.com' exec hide 327882R2FWJFW\prep.cmd >Bug.txt
'C:\327882R2FWJFW\nircmd.com' shexec install 327882R2FWJFW\nircmd.inf
'C:\327882R2FWJFW\NirCmd.cfexe' win close ititle "ComboFix"
'C:\327882R2FWJFW\NirCmd.cfexe' win close class "#32770"
'C:\327882R2FWJFW\sed.cfexe' "/\t.*\\nircmd\.inf$/I!d; s///; s/./@pv -kfi &/"
'<SYSTEM32>\CF15548.exe' /S /D /c" DIR /AD/B C:\* "
'C:\327882R2FWJFW\NirCmd.cfexe' execmd del "\327882R2FWJFW\prep.cmd"
'<SYSTEM32>\CF15548.exe' /f:off /d /c call Start_.cmd
'C:\327882R2FWJFW\NirCmd.cfexe' exec hide "<SYSTEM32>\CF15548.exe" /f:off /d /c call Start_.cmd
'C:\<Virus name>\grep.cfexe' -Fisq "Microsoft Windows [Version 5.2.3790]"
'<SYSTEM32>\CF15548.exe' /S /D /c" VER "
'<SYSTEM32>\CF15548.exe' /k c.bat
'C:\327882R2FWJFW\swreg.cfexe' query "hklm\software\microsoft\windows nt\currentversion" /v currentversion
'C:\327882R2FWJFW\findstr.cfexe' -LIXC:"<Virus name>" dirname00
'C:\327882R2FWJFW\findstr.cfexe' -IVX ComboFix
'C:\327882R2FWJFW\swreg.cfexe' acl "hklm\software\microsoft\windows nt\currentversion\windows" /de:f /q
'C:\327882R2FWJFW\swreg.cfexe' query "hklm\software\microsoft\windows nt\currentversion\windows"
'C:\327882R2FWJFW\grep.cfexe' -sq "currentversion.* 6.0" osVer00

Executes the following:

'<SYSTEM32>\runonce.exe' -r
'<SYSTEM32>\grpconv.exe' -o
'<SYSTEM32>\chcp.com' 1251
'%WINDIR%\regedit.exe' /s 327882R2FWJFW\EXE.reg
'<SYSTEM32>\cmd.exe' /c 327882R2FWJFW\prep.cmd >Bug.txt
'<SYSTEM32>\rundll32.exe' setupapi,InstallHinfSection DefaultInstall 132 C:\327882R2FWJFW\nircmd.inf

Modifies file system :

Creates the following files:

C:\327882R2FWJFW\safeboot.def.vista.dat
C:\327882R2FWJFW\SafeBootRepair.bat
C:\327882R2FWJFW\sed.cfexe
C:\327882R2FWJFW\safeboot.def.dat
C:\327882R2FWJFW\rogues.dat
C:\327882R2FWJFW\run2.sed
C:\327882R2FWJFW\safeboot.dat
C:\327882R2FWJFW\svchost.dat
C:\327882R2FWJFW\svchost.vista.dat
C:\327882R2FWJFW\svclist.sed
C:\327882R2FWJFW\SvcDrv.vbs
C:\327882R2FWJFW\SetEnvmt.bat
C:\327882R2FWJFW\setpath.cfexe
C:\327882R2FWJFW\SF.cfexe
C:\327882R2FWJFW\OSid.vbs
C:\327882R2FWJFW\Policies.dat
C:\327882R2FWJFW\Prep.cmd
C:\327882R2FWJFW\NirCmd.inf
C:\327882R2FWJFW\NetworkService.dat
C:\327882R2FWJFW\NirCmd.cfexe
C:\327882R2FWJFW\nircmd.com
C:\327882R2FWJFW\region.dat
C:\327882R2FWJFW\RestoreO4.bat
C:\327882R2FWJFW\restore_pt.vbs
C:\327882R2FWJFW\RegDo.sed
C:\327882R2FWJFW\Purity.dat
C:\327882R2FWJFW\pv.cfexe
C:\327882R2FWJFW\Qoo.bat
C:\327882R2FWJFW\osVer00
C:\327882R2FWJFW\MWindows.dat
C:\Start_.cmd
C:\327882R2FWJFW\dirname00
C:\327882R2FWJFW\attrib.cfexe
<SYSTEM32>\CF15548.exe
C:\327882R2FWJFW\FileName
C:\<Virus name>\Lang01
C:\<Virus name>\NlsLang
C:\<Virus name>\sum.bat
C:\<Virus name>\chcp.bat
C:\<Virus name>\kmd.dat
C:\<Virus name>\erunt.dat
C:\<Virus name>\lang00
C:\327882R2FWJFW\system_ini.dat
C:\327882R2FWJFW\toolbar.sed
C:\327882R2FWJFW\vfind.cfexe
C:\327882R2FWJFW\swxcacls.cfexe
C:\327882R2FWJFW\svc_wht.dat
C:\327882R2FWJFW\swreg.cfexe
C:\327882R2FWJFW\swsc.cfexe
C:\327882R2FWJFW\zip.cfexe
C:\Bug.txt
C:\327882R2FWJFW\findstr.cfexe
C:\327882R2FWJFW\zhsvc.dat
C:\327882R2FWJFW\whitedirB.dat
C:\327882R2FWJFW\WhiteLegacy.dat
C:\327882R2FWJFW\zDomain.dat
C:\327882R2FWJFW\netsvc.xp.dat
C:\327882R2FWJFW\DPF.str
C:\327882R2FWJFW\dumphive.cfexe
C:\327882R2FWJFW\embedded.sed
C:\327882R2FWJFW\DPF.sed
C:\327882R2FWJFW\dd.cfexe
C:\327882R2FWJFW\DelClsid.bat
C:\327882R2FWJFW\Disclaimer.bat
C:\327882R2FWJFW\ERUNT.LOC
C:\327882R2FWJFW\Exe.reg
C:\327882R2FWJFW\executables.dat
C:\327882R2FWJFW\ERUNT.cfexe
C:\327882R2FWJFW\ERDNT.e_e
C:\327882R2FWJFW\ERDNTDOS.LOC
C:\327882R2FWJFW\ERDNTWIN.LOC
C:\327882R2FWJFW\BootSect
C:\327882R2FWJFW\C.bat
C:\327882R2FWJFW\catchme.cfexe
C:\327882R2FWJFW\Boot.bat
C:\327882R2FWJFW\023.dat
C:\327882R2FWJFW\023v.dat
C:\327882R2FWJFW\badclsid
C:\327882R2FWJFW\Creg.dat
C:\327882R2FWJFW\CregC.cmd
C:\327882R2FWJFW\CregC.dat
C:\327882R2FWJFW\Comspec.bat
C:\327882R2FWJFW\clsid.dat
C:\327882R2FWJFW\Combo-Fix.sys
C:\327882R2FWJFW\Combobatch.bat
C:\327882R2FWJFW\md5
C:\327882R2FWJFW\md5deep.cfexe
C:\327882R2FWJFW\moveex.cfexe
C:\327882R2FWJFW\LocalSystemNetworkRestricted.dat
C:\327882R2FWJFW\LocalDrive.vbs
C:\327882R2FWJFW\LocalService.dat
C:\327882R2FWJFW\LocalServiceNetworkRestricted.dat
C:\327882R2FWJFW\netsvc.bad.dat
C:\327882R2FWJFW\netsvc.dat
C:\327882R2FWJFW\netsvc.vista.dat
C:\327882R2FWJFW\ND_.bat
C:\327882R2FWJFW\MoveIt.bat
C:\327882R2FWJFW\mtee.cfexe
C:\327882R2FWJFW\ndis_combofix.dat
C:\327882R2FWJFW\FIXLSP.bat
C:\327882R2FWJFW\FProps.vbs
C:\327882R2FWJFW\grep.cfexe
C:\327882R2FWJFW\FIND3M.bat
C:\327882R2FWJFW\extract.cfexe
C:\327882R2FWJFW\fdsv.cfexe
C:\327882R2FWJFW\Fin.dat
C:\327882R2FWJFW\LFN.vbs
C:\327882R2FWJFW\List-C.bat
C:\327882R2FWJFW\lnkread.vbs
C:\327882R2FWJFW\Lang.bat
C:\327882R2FWJFW\gsar.cfexe
C:\327882R2FWJFW\handle.cfexe
C:\327882R2FWJFW\history.bat

Deletes the following files:

C:\<Virus name>\lang00
C:\Start_.cmd
C:\<Virus name>\sum.bat
C:\<Virus name>\Lang01
C:\327882R2FWJFW\FileName
C:\327882R2FWJFW\NirCmd.inf
C:\327882R2FWJFW\osVer00
C:\327882R2FWJFW\dirname00

Moves the following files:

from C:\327882R2FWJFW\Prep.cmd to C:\<Virus name>\Prep.cmd
from C:\327882R2FWJFW\Purity.dat to C:\<Virus name>\Purity.dat
from C:\327882R2FWJFW\pv.cfexe to C:\<Virus name>\pv.cfexe
from C:\327882R2FWJFW\nircmd.com to C:\<Virus name>\nircmd.com
from C:\327882R2FWJFW\OSid.vbs to C:\<Virus name>\OSid.vbs
from C:\327882R2FWJFW\Policies.dat to C:\<Virus name>\Policies.dat
from C:\327882R2FWJFW\RestoreO4.bat to C:\<Virus name>\RestoreO4.bat
from C:\327882R2FWJFW\restore_pt.vbs to C:\<Virus name>\restore_pt.vbs
from C:\327882R2FWJFW\rogues.dat to C:\<Virus name>\rogues.dat
from C:\327882R2FWJFW\Qoo.bat to C:\<Virus name>\Qoo.bat
from C:\327882R2FWJFW\RegDo.sed to C:\<Virus name>\RegDo.sed
from C:\327882R2FWJFW\region.dat to C:\<Virus name>\region.dat
from C:\327882R2FWJFW\MWindows.dat to C:\<Virus name>\MWindows.dat
from C:\327882R2FWJFW\ndis_combofix.dat to C:\<Virus name>\ndis_combofix.dat
from C:\327882R2FWJFW\ND_.bat to C:\<Virus name>\ND_.bat
from C:\327882R2FWJFW\moveex.cfexe to C:\<Virus name>\moveex.cfexe
from C:\327882R2FWJFW\MoveIt.bat to C:\<Virus name>\MoveIt.bat
from C:\327882R2FWJFW\mtee.cfexe to C:\<Virus name>\mtee.cfexe
from C:\327882R2FWJFW\netsvc.xp.dat to C:\<Virus name>\netsvc.xp.dat
from C:\327882R2FWJFW\NetworkService.dat to C:\<Virus name>\NetworkService.dat
from C:\327882R2FWJFW\NirCmd.cfexe to C:\<Virus name>\NirCmd.cfexe
from C:\327882R2FWJFW\netsvc.bad.dat to C:\<Virus name>\netsvc.bad.dat
from C:\327882R2FWJFW\netsvc.dat to C:\<Virus name>\netsvc.dat
from C:\327882R2FWJFW\netsvc.vista.dat to C:\<Virus name>\netsvc.vista.dat
from C:\327882R2FWJFW\run2.sed to C:\<Virus name>\run2.sed
from C:\327882R2FWJFW\swxcacls.cfexe to C:\<Virus name>\swxcacls.cfexe
from C:\327882R2FWJFW\system_ini.dat to C:\<Virus name>\system_ini.dat
from C:\327882R2FWJFW\toolbar.sed to C:\<Virus name>\toolbar.sed
from C:\327882R2FWJFW\svc_wht.dat to C:\<Virus name>\svc_wht.dat
from C:\327882R2FWJFW\swreg.cfexe to C:\<Virus name>\swreg.cfexe
from C:\327882R2FWJFW\swsc.cfexe to C:\<Virus name>\swsc.cfexe
from C:\327882R2FWJFW\zDomain.dat to C:\<Virus name>\zDomain.dat
from C:\327882R2FWJFW\zhsvc.dat to C:\<Virus name>\zhsvc.dat
from C:\327882R2FWJFW\zip.cfexe to C:\<Virus name>\zip.cfexe
from C:\327882R2FWJFW\vfind.cfexe to C:\<Virus name>\vfind.cfexe
from C:\327882R2FWJFW\whitedirB.dat to C:\<Virus name>\whitedirB.dat
from C:\327882R2FWJFW\WhiteLegacy.dat to C:\<Virus name>\WhiteLegacy.dat
from C:\327882R2FWJFW\SafeBootRepair.bat to C:\<Virus name>\SafeBootRepair.bat
from C:\327882R2FWJFW\sed.cfexe to C:\<Virus name>\sed.cfexe
from C:\327882R2FWJFW\SetEnvmt.bat to C:\<Virus name>\SetEnvmt.bat
from C:\327882R2FWJFW\safeboot.dat to C:\<Virus name>\safeboot.dat
from C:\327882R2FWJFW\safeboot.def.dat to C:\<Virus name>\safeboot.def.dat
from C:\327882R2FWJFW\safeboot.def.vista.dat to C:\<Virus name>\safeboot.def.vista.dat
from C:\327882R2FWJFW\svchost.dat to C:\<Virus name>\svchost.dat
from C:\327882R2FWJFW\svchost.vista.dat to C:\<Virus name>\svchost.vista.dat
from C:\327882R2FWJFW\svclist.sed to C:\<Virus name>\svclist.sed
from C:\327882R2FWJFW\setpath.cfexe to C:\<Virus name>\setpath.cfexe
from C:\327882R2FWJFW\SF.cfexe to C:\<Virus name>\SF.cfexe
from C:\327882R2FWJFW\SvcDrv.vbs to C:\<Virus name>\SvcDrv.vbs
from C:\327882R2FWJFW\md5deep.cfexe to C:\<Virus name>\md5deep.cfexe
from C:\327882R2FWJFW\dd.cfexe to C:\<Virus name>\dd.cfexe
from C:\327882R2FWJFW\DelClsid.bat to C:\<Virus name>\DelClsid.bat
from C:\327882R2FWJFW\Disclaimer.bat to C:\<Virus name>\Disclaimer.bat
from C:\327882R2FWJFW\Creg.dat to C:\<Virus name>\Creg.dat
from C:\327882R2FWJFW\CregC.cmd to C:\<Virus name>\CregC.cmd
from C:\327882R2FWJFW\CregC.dat to C:\<Virus name>\CregC.dat
from C:\327882R2FWJFW\embedded.sed to C:\<Virus name>\embedded.sed
from C:\327882R2FWJFW\ERDNT.e_e to C:\<Virus name>\ERDNT.e_e
from C:\327882R2FWJFW\ERDNTDOS.LOC to C:\<Virus name>\ERDNTDOS.LOC
from C:\327882R2FWJFW\DPF.sed to C:\<Virus name>\DPF.sed
from C:\327882R2FWJFW\DPF.str to C:\<Virus name>\DPF.str
from C:\327882R2FWJFW\dumphive.cfexe to C:\<Virus name>\dumphive.cfexe
from C:\327882R2FWJFW\badclsid to C:\<Virus name>\badclsid
from C:\327882R2FWJFW\Boot.bat to C:\<Virus name>\Boot.bat
from C:\327882R2FWJFW\BootSect to C:\<Virus name>\BootSect
from C:\327882R2FWJFW\023.dat to C:\<Virus name>\023.dat
from C:\327882R2FWJFW\023v.dat to C:\<Virus name>\023v.dat
from C:\327882R2FWJFW\attrib.cfexe to C:\<Virus name>\attrib.cfexe
from C:\327882R2FWJFW\Combo-Fix.sys to C:\<Virus name>\Combo-Fix.sys
from C:\327882R2FWJFW\Combobatch.bat to C:\<Virus name>\Combobatch.bat
from C:\327882R2FWJFW\Comspec.bat to C:\<Virus name>\Comspec.bat
from C:\327882R2FWJFW\C.bat to C:\<Virus name>\C.bat
from C:\327882R2FWJFW\catchme.cfexe to C:\<Virus name>\catchme.cfexe
from C:\327882R2FWJFW\clsid.dat to C:\<Virus name>\clsid.dat
from C:\327882R2FWJFW\ERDNTWIN.LOC to C:\<Virus name>\ERDNTWIN.LOC
from C:\327882R2FWJFW\Lang.bat to C:\<Virus name>\Lang.bat
from C:\327882R2FWJFW\LFN.vbs to C:\<Virus name>\LFN.vbs
from C:\327882R2FWJFW\List-C.bat to C:\<Virus name>\List-C.bat
from C:\327882R2FWJFW\gsar.cfexe to C:\<Virus name>\gsar.cfexe
from C:\327882R2FWJFW\handle.cfexe to C:\<Virus name>\handle.cfexe
from C:\327882R2FWJFW\history.bat to C:\<Virus name>\history.bat
from C:\327882R2FWJFW\LocalServiceNetworkRestricted.dat to C:\<Virus name>\LocalServiceNetworkRestricted.dat
from C:\327882R2FWJFW\LocalSystemNetworkRestricted.dat to C:\<Virus name>\LocalSystemNetworkRestricted.dat
from C:\327882R2FWJFW\md5 to C:\<Virus name>\md5
from C:\327882R2FWJFW\lnkread.vbs to C:\<Virus name>\lnkread.vbs
from C:\327882R2FWJFW\LocalDrive.vbs to C:\<Virus name>\LocalDrive.vbs
from C:\327882R2FWJFW\LocalService.dat to C:\<Virus name>\LocalService.dat
from C:\327882R2FWJFW\executables.dat to C:\<Virus name>\executables.dat
from C:\327882R2FWJFW\extract.cfexe to C:\<Virus name>\extract.cfexe
from C:\327882R2FWJFW\fdsv.cfexe to C:\<Virus name>\fdsv.cfexe
from C:\327882R2FWJFW\ERUNT.cfexe to C:\<Virus name>\ERUNT.cfexe
from C:\327882R2FWJFW\ERUNT.LOC to C:\<Virus name>\ERUNT.LOC
from C:\327882R2FWJFW\Exe.reg to C:\<Virus name>\Exe.reg
from C:\327882R2FWJFW\FIXLSP.bat to C:\<Virus name>\FIXLSP.bat
from C:\327882R2FWJFW\FProps.vbs to C:\<Virus name>\FProps.vbs
from C:\327882R2FWJFW\grep.cfexe to C:\<Virus name>\grep.cfexe
from C:\327882R2FWJFW\Fin.dat to C:\<Virus name>\Fin.dat
from C:\327882R2FWJFW\FIND3M.bat to C:\<Virus name>\FIND3M.bat
from C:\327882R2FWJFW\findstr.cfexe to C:\<Virus name>\findstr.cfexe

Miscellaneous:

Searches for the following windows:

ClassName: 'RegEdit_RegEdit' WindowName: '(null)'
ClassName: 'Shell_TrayWnd' WindowName: '(null)'
ClassName: 'EDIT' WindowName: '(null)'

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Technical Information

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