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Trojan.Siggen11.57675

Added to the Dr.Web virus database: 2021-01-07

Virus description added:

Technical Information

To ensure autorun and distribution
Modifies the following registry keys
  • [<HKLM>\SOFTWARE\Wow6432Node\Microsoft\Windows\CurrentVersion\Run\] 'NVIDIA driver monitor' = '%WINDIR%\nvsvc32.exe'
  • [<HKCU>\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\] 'NVIDIA driver monitor' = '%WINDIR%\nvsvc32.exe'
  • [<HKLM>\SOFTWARE\Wow6432Node\Microsoft\Windows NT\CurrentVersion\Terminal Server\Install\Software\Microsoft\Windows\CurrentVersion\Run] 'NVIDIA driver monitor' = '%WINDIR%\nvsvc32.exe'
Malicious functions
To bypass firewall, removes or modifies the following registry keys
  • [<HKLM>\SYSTEM\CurrentControlSet\Services\SharedAccess\Parameters\FirewallPolicy\StandardProfile\AuthorizedApplications\List] '<Full path to file>' = '<Full path to file>:*:Enabled:NVIDIA drive...
  • [<HKLM>\SYSTEM\CurrentControlSet\Services\SharedAccess\Parameters\FirewallPolicy\StandardProfile\AuthorizedApplications\List] '<Full path to file>' = '%WINDIR%\nvsvc32.exe:*:Enabled:NVIDIA driv...
To complicate detection of its presence in the operating system,
blocks execution of the following system utilities:
  • Windows Update
Executes the following
  • '%WINDIR%\syswow64\net.exe' stop wuauserv
  • '%WINDIR%\syswow64\net.exe' stop MsMpSvc
  • '%WINDIR%\syswow64\netsh.exe' firewall add allowedprogram 1.exe 1 ENABLE
Modifies file system
Creates the following files
  • %WINDIR%\nvsvc32.exe
Sets the 'hidden' attribute to the following files
  • <Full path to file>
  • %WINDIR%\nvsvc32.exe
Network activity
TCP
HTTP GET requests
  • http://br#####sers.myspace.com/Browse/Browse.aspx
  • 'br#####sers.myspace.com':443
    • UDP
    • DNS ASK as###.ic.ac.uk
    • DNS ASK ma#.#guia.cl
    • DNS ASK al#####shistory.info
    • DNS ASK ma#.#osbank.com
    • DNS ASK er####rlounge.de
    • DNS ASK ma#.###gosbakugan.net
    • DNS ASK sc####service.com
    • DNS ASK xx#.#agdcom.de
    • DNS ASK ol#.###gjuyt2tugas.com
    • DNS ASK he####ger.x-y.net
    • DNS ASK so####mpton.ac.uk
    • DNS ASK op#.####andathletics.com
    • DNS ASK uk#.##nkedin.com
    • DNS ASK re#####-action.org.uk
    • DNS ASK op#.##nin.irf.se
    • DNS ASK jb.#sm.org
    • DNS ASK ma#.##lamontada.com
    • DNS ASK ma#.##ivie.ac.at
    • DNS ASK pr#.##ndmines.org
    • DNS ASK ep#.##nmablog.jp
    • DNS ASK mi#.###naturistclub.com
    • DNS ASK be##.neogen.ro
    • DNS ASK ol#.#ouku.com
    • DNS ASK go###eads.com
    • DNS ASK hr#.uh.edu
    • DNS ASK tr###dvisor.com
    • DNS ASK mi#.###ce-erotske.in.rs
    • DNS ASK ol#.###temofadown.com
    • DNS ASK at#.##coctelera.net
    • DNS ASK al#.##kibili.com
    • DNS ASK ve###tek.com
    • DNS ASK ap#.####rtoshistory.info
    • DNS ASK jo######faccountancy.com
    • DNS ASK tr####ationale.org
    • DNS ASK ma#.#730ip.com
    • DNS ASK br#####sers.myspace.com
    • DNS ASK my##ace.com
    • DNS ASK st###ntime.info
    • DNS ASK sh###man.com
    • DNS ASK in####highered.com
    • DNS ASK ft#.##oenix-cc.net
    • DNS ASK sc####idyscrubs.com
    • DNS ASK we#####trafficspy.com
    • DNS ASK qu#.51.com
    • DNS ASK su#####uni-sw.eesp.ch
    • DNS ASK sh###tyle.com
    • DNS ASK xx#.##opklatka.pl
    • DNS ASK un###fed.com
    • DNS ASK mc##.#vengine.com
    • DNS ASK de#####mccloskey.org
    • DNS ASK jo####ls.lww.com
    • DNS ASK mi####astpost.org
    • DNS ASK ma#.##chivum.info
    • DNS ASK ma#.#time.com
    • DNS ASK mm#.###balatrust.org
    Miscellaneous
    Searches for the following windows
    • ClassName: 'HTMLSOURCEVIEW' WindowName: ''
    • ClassName: 'IEFrame' WindowName: ''
    • ClassName: 'Frame Tab' WindowName: ''
    • ClassName: 'TabWindowClass' WindowName: ''
    • ClassName: 'Shell DocObject View' WindowName: ''
    • ClassName: 'Internet Explorer_Server' WindowName: ''
    • ClassName: 'WorkerW' WindowName: ''
    • ClassName: 'ReBarWindow32' WindowName: ''
    • ClassName: 'Address Band Root' WindowName: ''
    • ClassName: 'msctls_statusbar32' WindowName: ''
    • ClassName: 'ComboBoxEx32' WindowName: ''
    • ClassName: 'ComboBox' WindowName: ''
    • ClassName: 'Static' WindowName: ''
    • ClassName: 'MS_AutodialMonitor' WindowName: ''
    • ClassName: 'MS_WebCheckMonitor' WindowName: ''
    Creates and executes the following
    • '%WINDIR%\nvsvc32.exe'
    • '%WINDIR%\nvsvc32.exe' ' (with hidden window)
    • '%WINDIR%\syswow64\net.exe' stop wuauserv' (with hidden window)
    • '%WINDIR%\syswow64\net.exe' stop MsMpSvc' (with hidden window)
    • '%WINDIR%\syswow64\sc.exe' config wuauserv start= disabled' (with hidden window)
    • '%WINDIR%\syswow64\sc.exe' config MsMpSvc start= disabled' (with hidden window)
    • '%WINDIR%\syswow64\netsh.exe' firewall add allowedprogram 1.exe 1 ENABLE' (with hidden window)
    Executes the following
    • '%WINDIR%\syswow64\sc.exe' config wuauserv start= disabled
    • '%WINDIR%\syswow64\sc.exe' config MsMpSvc start= disabled
    • '%WINDIR%\syswow64\explorer.exe' http://br#####sers.myspace.com/Browse/Browse.aspx
    • '%WINDIR%\syswow64\net1.exe' stop MsMpSvc
    • '%WINDIR%\syswow64\net1.exe' stop wuauserv

    Curing recommendations

    1. If the operating system (OS) can be loaded (either normally or in safe mode), download Dr.Web Security Space and run a full scan of your computer and removable media you use. More about Dr.Web Security Space.
    2. If you cannot boot the OS, change the BIOS settings to boot your system from a CD or USB drive. Download the image of the emergency system repair disk Dr.Web® LiveDisk , mount it on a USB drive or burn it to a CD/DVD. After booting up with this media, run a full scan and cure all the detected threats.
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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;
      • Switch off your device and turn it on as normal.

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