BackDoor.DarkCrystalNET.17

Technical Information

To ensure autorun and distribution

Creates or modifies the following files

<SYSTEM32>\tasks\iexplorei
<SYSTEM32>\tasks\iexplore
<SYSTEM32>\tasks\idlei
<SYSTEM32>\tasks\idle
<SYSTEM32>\tasks\spoolsvs
<SYSTEM32>\tasks\wudfhostw
<SYSTEM32>\tasks\spoolsv
<SYSTEM32>\tasks\smsss
<SYSTEM32>\tasks\smss
<SYSTEM32>\tasks\wudfhost

Modifies file system

Creates the following files

C:\comsessioncrtsvc\70d3rtbj6j4v6p.bat
%TEMP%\r0ztxklito
%TEMP%\tmpf06e0.tmp
C:\msocache\all users\{90140000-0016-0409-1000-0000000ff1ce}-c\6ccacd8608530f
C:\msocache\all users\{90140000-0016-0409-1000-0000000ff1ce}-c\idle.exe
C:\comsessioncrtsvc\69ddcba757bf72
C:\comsessioncrtsvc\smss.exe
C:\comsessioncrtsvc\480b7989c529f6
%TEMP%\egxcg3vtgu.bat
C:\comsessioncrtsvc\wudfhost.exe
%ALLUSERSPROFILE%\favorites\spoolsv.exe
C:\recovery\1195d5a8-f371-11e4-9c00-dd3082671db2\6ccacd8608530f
C:\recovery\1195d5a8-f371-11e4-9c00-dd3082671db2\idle.exe
C:\recovery\1195d5a8-f371-11e4-9c00-dd3082671db2\9db6e019d4f04e
C:\recovery\1195d5a8-f371-11e4-9c00-dd3082671db2\iexplore.exe
C:\comsessioncrtsvc\f3mltcbkvhugrp9lkvrvqiayiw.vbe
C:\comsessioncrtsvc\blockdhcpsvc.exe
%ALLUSERSPROFILE%\favorites\f3b6ecef712a24
nul

Deletes the following files

%TEMP%\r0ztxklito

Network activity

UDP

DNS ASK au###.##webcommunity.org
'localhost':123

Miscellaneous

Searches for the following windows

ClassName: 'EDIT' WindowName: ''

Creates and executes the following

'%WINDIR%\syswow64\wscript.exe' "C:\ComsessionCrtsvc\f3MLtcbkVHugrp9LKvRvqIaYIW.vbe"
'C:\comsessioncrtsvc\blockdhcpsvc.exe'
'C:\comsessioncrtsvc\wudfhost.exe'
'%WINDIR%\syswow64\cmd.exe' /c ""C:\ComsessionCrtsvc\70d3RtBj6J4v6P.bat" "' (with hidden window)
'<SYSTEM32>\cmd.exe' /C "%TEMP%\EGxcg3vTGU.bat"' (with hidden window)

Executes the following

'%WINDIR%\syswow64\cmd.exe' /c ""C:\ComsessionCrtsvc\70d3RtBj6J4v6P.bat" "
'<SYSTEM32>\windowspowershell\v1.0\powershell.exe' -Command Add-MpPreference -ExclusionPath 'C:/$Recycle.Bin/'
'<SYSTEM32>\windowspowershell\v1.0\powershell.exe' -Command Add-MpPreference -ExclusionPath 'C:/'
'<SYSTEM32>\windowspowershell\v1.0\powershell.exe' -Command Add-MpPreference -ExclusionPath 'C:/Documents and Settings/'
'<SYSTEM32>\windowspowershell\v1.0\powershell.exe' -Command Add-MpPreference -ExclusionPath 'C:/ComsessionCrtsvc/'
'<SYSTEM32>\windowspowershell\v1.0\powershell.exe' -Command Add-MpPreference -ExclusionPath 'C:/Far2/'
'<SYSTEM32>\windowspowershell\v1.0\powershell.exe' -Command Add-MpPreference -ExclusionPath 'C:/kmqbpzt/'
'<SYSTEM32>\windowspowershell\v1.0\powershell.exe' -Command Add-MpPreference -ExclusionPath 'C:/MSOCache/'
'<SYSTEM32>\windowspowershell\v1.0\powershell.exe' -Command Add-MpPreference -ExclusionPath 'C:/Program Files/'
'<SYSTEM32>\cmd.exe' /C "%TEMP%\EGxcg3vTGU.bat"
'<SYSTEM32>\windowspowershell\v1.0\powershell.exe' -Command Add-MpPreference -ExclusionPath 'C:/Program Files (x86)/'
'<SYSTEM32>\windowspowershell\v1.0\powershell.exe' -Command Add-MpPreference -ExclusionPath 'C:/Recovery/'
'<SYSTEM32>\windowspowershell\v1.0\powershell.exe' -Command Add-MpPreference -ExclusionPath 'C:/ProgramData/'
'<SYSTEM32>\windowspowershell\v1.0\powershell.exe' -Command Add-MpPreference -ExclusionPath 'C:/System Volume Information/'
'<SYSTEM32>\windowspowershell\v1.0\powershell.exe' -Command Add-MpPreference -ExclusionPath 'C:/totalcmd/'
'<SYSTEM32>\windowspowershell\v1.0\powershell.exe' -Command Add-MpPreference -ExclusionPath 'C:/Users/'
'<SYSTEM32>\windowspowershell\v1.0\powershell.exe' -Command Add-MpPreference -ExclusionPath 'C:/Windows/'
'<SYSTEM32>\schtasks.exe' /create /tn "WUDFHostW" /sc MINUTE /mo 5 /tr "'C:\ComsessionCrtsvc\WUDFHost.exe'" /rl HIGHEST /f
'<SYSTEM32>\windowspowershell\v1.0\powershell.exe' -Command Add-MpPreference -ExclusionPath 'C:/PerfLogs/'
'<SYSTEM32>\schtasks.exe' /create /tn "WUDFHostW" /sc MINUTE /mo 12 /tr "'C:\ComsessionCrtsvc\WUDFHost.exe'" /f
'<SYSTEM32>\schtasks.exe' /create /tn "spoolsv" /sc ONLOGON /tr "'%ALLUSERSPROFILE%\Favorites\spoolsv.exe'" /rl HIGHEST /f
'<SYSTEM32>\schtasks.exe' /create /tn "iexplorei" /sc MINUTE /mo 12 /tr "'C:\Recovery\1195d5a8-f371-11e4-9c00-dd3082671db2\iexplore.exe'" /f
'<SYSTEM32>\schtasks.exe' /create /tn "iexplore" /sc ONLOGON /tr "'C:\Recovery\1195d5a8-f371-11e4-9c00-dd3082671db2\iexplore.exe'" /rl HIGHEST /f
'<SYSTEM32>\schtasks.exe' /create /tn "iexplorei" /sc MINUTE /mo 14 /tr "'C:\Recovery\1195d5a8-f371-11e4-9c00-dd3082671db2\iexplore.exe'" /rl HIGHEST /f
'<SYSTEM32>\schtasks.exe' /create /tn "IdleI" /sc MINUTE /mo 11 /tr "'C:\Recovery\1195d5a8-f371-11e4-9c00-dd3082671db2\Idle.exe'" /f
'<SYSTEM32>\schtasks.exe' /create /tn "Idle" /sc ONLOGON /tr "'C:\Recovery\1195d5a8-f371-11e4-9c00-dd3082671db2\Idle.exe'" /rl HIGHEST /f
'<SYSTEM32>\schtasks.exe' /create /tn "IdleI" /sc MINUTE /mo 13 /tr "'C:\Recovery\1195d5a8-f371-11e4-9c00-dd3082671db2\Idle.exe'" /rl HIGHEST /f
'<SYSTEM32>\schtasks.exe' /create /tn "spoolsvs" /sc MINUTE /mo 5 /tr "'%ALLUSERSPROFILE%\Favorites\spoolsv.exe'" /f
'<SYSTEM32>\schtasks.exe' /create /tn "spoolsvs" /sc MINUTE /mo 5 /tr "'%ALLUSERSPROFILE%\Favorites\spoolsv.exe'" /rl HIGHEST /f
'<SYSTEM32>\schtasks.exe' /create /tn "Idle" /sc ONLOGON /tr "'C:\MSOCache\All Users\{90140000-0016-0409-1000-0000000FF1CE}-C\Idle.exe'" /rl HIGHEST /f
'<SYSTEM32>\schtasks.exe' /create /tn "WUDFHostW" /sc MINUTE /mo 6 /tr "'C:\ComsessionCrtsvc\WUDFHost.exe'" /f
'<SYSTEM32>\schtasks.exe' /create /tn "WUDFHost" /sc ONLOGON /tr "'C:\ComsessionCrtsvc\WUDFHost.exe'" /rl HIGHEST /f
'<SYSTEM32>\schtasks.exe' /create /tn "WUDFHostW" /sc MINUTE /mo 12 /tr "'C:\ComsessionCrtsvc\WUDFHost.exe'" /rl HIGHEST /f
'<SYSTEM32>\schtasks.exe' /create /tn "smsss" /sc MINUTE /mo 6 /tr "'C:\ComsessionCrtsvc\smss.exe'" /f
'<SYSTEM32>\schtasks.exe' /create /tn "smss" /sc ONLOGON /tr "'C:\ComsessionCrtsvc\smss.exe'" /rl HIGHEST /f
'<SYSTEM32>\schtasks.exe' /create /tn "smsss" /sc MINUTE /mo 12 /tr "'C:\ComsessionCrtsvc\smss.exe'" /rl HIGHEST /f
'<SYSTEM32>\schtasks.exe' /create /tn "IdleI" /sc MINUTE /mo 12 /tr "'C:\MSOCache\All Users\{90140000-0016-0409-1000-0000000FF1CE}-C\Idle.exe'" /f
'<SYSTEM32>\schtasks.exe' /create /tn "IdleI" /sc MINUTE /mo 12 /tr "'C:\MSOCache\All Users\{90140000-0016-0409-1000-0000000FF1CE}-C\Idle.exe'" /rl HIGHEST /f
'<SYSTEM32>\w32tm.exe' /stripchart /computer:localhost /period:5 /dataonly /samples:2