BackDoor.DarkCrystalNET.11

Technical Information

To ensure autorun and distribution

Modifies the following registry keys

[<HKLM>\Software\Wow6432Node\Microsoft\Windows\CurrentVersion\Run] 'lsm' = '"<Current directory>\lsm.exe"'
[<HKLM>\Software\Wow6432Node\Microsoft\Windows NT\CurrentVersion\Winlogon] 'Shell' = 'explorer.exe, "<Current directory>\lsm.exe"'
[<HKLM>\Software\Wow6432Node\Microsoft\Windows\CurrentVersion\Run] 'csrss' = '"C:\Users\Default\csrss.exe"'
[<HKLM>\Software\Wow6432Node\Microsoft\Windows NT\CurrentVersion\Winlogon] 'Shell' = 'explorer.exe, "<Current directory>\lsm.exe", "C:\Users\Default\csrss.exe"'
[<HKLM>\Software\Wow6432Node\Microsoft\Windows\CurrentVersion\Run] 'System' = '"C:\totalcmd\LANGUAGE\System.exe"'
[<HKLM>\Software\Wow6432Node\Microsoft\Windows NT\CurrentVersion\Winlogon] 'Shell' = 'explorer.exe, "<Current directory>\lsm.exe", "C:\Users\Default\csrss.exe", "C:\totalcmd\LANGUAGE\System.exe...
[<HKLM>\Software\Wow6432Node\Microsoft\Windows\CurrentVersion\Run] 'csrss' = '"C:\Far2\Addons\XLat\Russian\csrss.exe"'
[<HKLM>\Software\Wow6432Node\Microsoft\Windows\CurrentVersion\Run] 'csrss' = '"C:\MSOCache\All Users\{90140000-0019-0409-1000-0000000FF1CE}-C\csrss.exe"'

Creates or modifies the following files

<SYSTEM32>\tasks\lsm
<SYSTEM32>\tasks\lsml
<SYSTEM32>\tasks\csrss
<SYSTEM32>\tasks\csrssc
<SYSTEM32>\tasks\system
<SYSTEM32>\tasks\systems

Malicious functions

Reads files which store third party applications passwords

%ProgramFiles(x86)%\steam\config\config.vdf
%ProgramFiles(x86)%\steam\config\dialogconfig.vdf
%LOCALAPPDATA%\google\chrome\user data\default\cookies
%LOCALAPPDATA%\google\chrome\user data\default\login data
%APPDATA%\opera software\opera stable\login data
%LOCALAPPDATA%\google\chrome\user data\default\web data
%HOMEPATH%\desktop\glidescope_review_rev_010.docx
%HOMEPATH%\desktop\hadac_newsletter_july_2010_final.docx
%HOMEPATH%\desktop\hanni_umami_chapter.doc
%HOMEPATH%\desktop\holycrosschurchinstructions.docx
%HOMEPATH%\desktop\issi2013_template_for_posters.docx
%HOMEPATH%\desktop\nwfieldnotes1966.docx
%HOMEPATH%\desktop\ovp25012015.doc

Modifies file system

Creates the following files

<Current directory>\lsm.exe
%TEMP%\zhhu0mubqs
%TEMP%\x6gey3f0um
%TEMP%\3sc1dkhkql
%TEMP%\in0do3qbsv
%TEMP%\awfe3mju7m
%TEMP%\0kf4loemry
%TEMP%\qb5op92ew9
%TEMP%\vmfcz2io3z
%TEMP%\ct3e4lp7uv
%TEMP%\mwyozonwer
%TEMP%\48zgzukcky
%TEMP%\xtdeofb1qt
%TEMP%\leipmjqdoc
%TEMP%\jvmh0txi7s
%TEMP%\s17agvrecu
nul
%TEMP%\js1hlmrabu.bat
%TEMP%\exls9v6r1e
C:\msocache\all users\{90140000-0019-0409-1000-0000000ff1ce}-c\886983d96e3d3e
C:\msocache\all users\{90140000-0019-0409-1000-0000000ff1ce}-c\csrss.exe
C:\far2\addons\xlat\russian\886983d96e3d3e
C:\far2\addons\xlat\russian\csrss.exe
C:\totalcmd\language\27d1bcfc3c54e0
C:\totalcmd\language\system.exe
C:\users\default\886983d96e3d3e
C:\users\default\csrss.exe
<Current directory>\101b941d020240
%TEMP%\hn3wfs4okt
%TEMP%\fzevymqwov

Deletes the following files

%TEMP%\exls9v6r1e
%TEMP%\zhhu0mubqs
%TEMP%\x6gey3f0um
%TEMP%\3sc1dkhkql
%TEMP%\in0do3qbsv
%TEMP%\awfe3mju7m
%TEMP%\0kf4loemry
%TEMP%\qb5op92ew9
%TEMP%\vmfcz2io3z
%TEMP%\ct3e4lp7uv
%TEMP%\mwyozonwer
%TEMP%\48zgzukcky
%TEMP%\xtdeofb1qt
%TEMP%\leipmjqdoc
%TEMP%\jvmh0txi7s
%TEMP%\s17agvrecu
%TEMP%\hn3wfs4okt
%TEMP%\fzevymqwov

Network activity

Connects to

'62.##9.2.159':80
'ip##fo.io':443
'ap#.##legram.org':443

TCP

HTTP GET requests

http://62.##9.2.159/protectGame/PhpBetterauth/67Game/Dle/UploadsPrivate2/ImageEternalDump/HttpTrack/GeoTestSql/CpuUpdate77/1LineUploadsUpdate/BigloadJavascripteternalpublic/Asynctraffic.php?Py#...
http://62.##9.2.159/protectGame/PhpBetterauth/67Game/Dle/UploadsPrivate2/ImageEternalDump/HttpTrack/GeoTestSql/CpuUpdate77/1LineUploadsUpdate/BigloadJavascripteternalpublic/Asynctraffic.php?04#...

Other

'ip##fo.io':443
'ap#.##legram.org':443

UDP

DNS ASK ip##fo.io
DNS ASK ap#.##legram.org
'localhost':123

Miscellaneous

Creates and executes the following

'C:\users\default\csrss.exe'
'%WINDIR%\syswow64\cmd.exe' /C "%TEMP%\jS1HLmrabU.bat"' (with hidden window)

Executes the following

'<SYSTEM32>\schtasks.exe' /create /tn "lsm" /sc MINUTE /mo 6 /tr "'<Current directory>\lsm.exe'" /rl HIGHEST /f
'%WINDIR%\syswow64\cmd.exe' /C "%TEMP%\jS1HLmrabU.bat"
'<SYSTEM32>\schtasks.exe' /create /tn "csrssc" /sc MINUTE /mo 14 /tr "'C:\MSOCache\All Users\{90140000-0019-0409-1000-0000000FF1CE}-C\csrss.exe'" /f
'<SYSTEM32>\schtasks.exe' /create /tn "csrss" /sc ONSTART /tr "'C:\MSOCache\All Users\{90140000-0019-0409-1000-0000000FF1CE}-C\csrss.exe'" /rl HIGHEST /f
'<SYSTEM32>\schtasks.exe' /create /tn "csrss" /sc ONLOGON /tr "'C:\MSOCache\All Users\{90140000-0019-0409-1000-0000000FF1CE}-C\csrss.exe'" /rl HIGHEST /f
'<SYSTEM32>\schtasks.exe' /create /tn "csrss" /sc MINUTE /mo 8 /tr "'C:\MSOCache\All Users\{90140000-0019-0409-1000-0000000FF1CE}-C\csrss.exe'" /rl HIGHEST /f
'<SYSTEM32>\schtasks.exe' /create /tn "csrssc" /sc MINUTE /mo 6 /tr "'C:\Far2\Addons\XLat\Russian\csrss.exe'" /f
'<SYSTEM32>\schtasks.exe' /create /tn "csrss" /sc ONSTART /tr "'C:\Far2\Addons\XLat\Russian\csrss.exe'" /rl HIGHEST /f
'<SYSTEM32>\schtasks.exe' /create /tn "csrss" /sc ONLOGON /tr "'C:\Far2\Addons\XLat\Russian\csrss.exe'" /rl HIGHEST /f
'<SYSTEM32>\schtasks.exe' /create /tn "csrss" /sc MINUTE /mo 5 /tr "'C:\Far2\Addons\XLat\Russian\csrss.exe'" /rl HIGHEST /f
'%WINDIR%\syswow64\w32tm.exe' /stripchart /computer:localhost /period:5 /dataonly /samples:2
'<SYSTEM32>\schtasks.exe' /create /tn "SystemS" /sc MINUTE /mo 10 /tr "'C:\totalcmd\LANGUAGE\System.exe'" /f
'<SYSTEM32>\schtasks.exe' /create /tn "System" /sc ONLOGON /tr "'C:\totalcmd\LANGUAGE\System.exe'" /rl HIGHEST /f
'<SYSTEM32>\schtasks.exe' /create /tn "System" /sc MINUTE /mo 6 /tr "'C:\totalcmd\LANGUAGE\System.exe'" /rl HIGHEST /f
'<SYSTEM32>\schtasks.exe' /create /tn "csrssc" /sc MINUTE /mo 10 /tr "'C:\Users\Default\csrss.exe'" /f
'<SYSTEM32>\schtasks.exe' /create /tn "csrss" /sc ONSTART /tr "'C:\Users\Default\csrss.exe'" /rl HIGHEST /f
'<SYSTEM32>\schtasks.exe' /create /tn "csrss" /sc ONLOGON /tr "'C:\Users\Default\csrss.exe'" /rl HIGHEST /f
'<SYSTEM32>\schtasks.exe' /create /tn "csrss" /sc MINUTE /mo 7 /tr "'C:\Users\Default\csrss.exe'" /rl HIGHEST /f
'<SYSTEM32>\schtasks.exe' /create /tn "lsml" /sc MINUTE /mo 9 /tr "'<Current directory>\lsm.exe'" /f
'<SYSTEM32>\schtasks.exe' /create /tn "lsm" /sc ONSTART /tr "'<Current directory>\lsm.exe'" /rl HIGHEST /f
'<SYSTEM32>\schtasks.exe' /create /tn "lsm" /sc ONLOGON /tr "'<Current directory>\lsm.exe'" /rl HIGHEST /f
'<SYSTEM32>\schtasks.exe' /create /tn "System" /sc ONSTART /tr "'C:\totalcmd\LANGUAGE\System.exe'" /rl HIGHEST /f
'<SYSTEM32>\w32tm.exe' /stripchart /computer:localhost /period:5 /dataonly /samples:2