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Trojan.Siggen8.52743

Added to the Dr.Web virus database: 2019-11-01

Virus description added:

Technical Information

To ensure autorun and distribution
Modifies the following registry keys
  • [<HKCU>\Software\Microsoft\Windows\CurrentVersion\Run] 'AS2014' = '%PROGRAMDATA%\gqgygsgg\gqgygsgg.exe'
  • [<HKLM>\Software\Microsoft\Windows\CurrentVersion\Run] 'AS2014' = '%PROGRAMDATA%\gqgygsgg\gqgygsgg.exe'
  • [<HKLM>\Software\Microsoft\Windows NT\CurrentVersion\Winlogon] 'Userinit' = 'userinit.exe,%PROGRAMDATA%\gqgygsgg\gqgygsgg.exe -sm,'
Malicious functions
To complicate detection of its presence in the operating system,
blocks execution of the following system utilities:
  • Windows Update
  • Windows Security Center
  • Windows Defender
blocks the following features:
  • User Account Control (UAC)
  • Windows Security Center
Terminates or attempts to terminate
the following user processes:
  • firefox.exe
Modifies file system
Creates the following files
  • %PROGRAMDATA%\gqgygsgg\gqgygsgg.exe
  • %PROGRAMDATA%\gqgygsgg\gqgygsggyvsagggg.in
  • %PROGRAMDATA%\gqgygsgg\gqgygsgg.exe.manifest
  • %PROGRAMDATA%\gqgygsgg\gqgygsgg.ico
  • %PROGRAMDATA%\gqgygsgg\serv.bat
  • nul
  • %APPDATA%\microsoft\windows\start menu\programs\antivirus security pro\antivirus security pro.lnk
  • %HOMEPATH%\desktop\antivirus security pro support.url
  • %APPDATA%\microsoft\windows\start menu\programs\antivirus security pro\antivirus security pro support.url
  • %HOMEPATH%\desktop\antivirus security pro.lnk
Network activity
Connects to
  • '21#.#35.1.127':80
Miscellaneous
Searches for the following windows
  • ClassName: 'fwcplui_class' WindowName: ''
  • ClassName: 'wscui_class' WindowName: ''
  • ClassName: 'MSASCUI_class' WindowName: ''
Creates and executes the following
  • '<SYSTEM32>\cmd.exe' /C "%PROGRAMDATA%\gqgygsgg\serv.bat"' (with hidden window)
Executes the following
  • '<SYSTEM32>\cmd.exe' /C "%PROGRAMDATA%\gqgygsgg\serv.bat"
  • '<SYSTEM32>\reg.exe' add "HKLM\SOFTWARE\Microsoft\Security Center" /v UpdatesDisableNotify /t REG_DWORD /d 1 /f
  • '<SYSTEM32>\reg.exe' add "HKLM\SOFTWARE\Microsoft\Security Center\Svc" /v UpdatesDisableNotify /t REG_DWORD /d 1 /f
  • '<SYSTEM32>\reg.exe' add "HKLM\SOFTWARE\Microsoft\Security Center" /v FirewallOverride /t REG_DWORD /d 1 /f
  • '<SYSTEM32>\reg.exe' add "HKLM\SOFTWARE\Microsoft\Security Center\Svc" /v FirewallOverride /t REG_DWORD /d 1 /f
  • '<SYSTEM32>\reg.exe' add "HKLM\SOFTWARE\Microsoft\Security Center" /v FirewallDisableNotify /t REG_DWORD /d 1 /f
  • '<SYSTEM32>\reg.exe' add "HKLM\SOFTWARE\Microsoft\Security Center\Svc" /v FirewallDisableNotify /t REG_DWORD /d 1 /f
  • '<SYSTEM32>\reg.exe' add "HKLM\SOFTWARE\Microsoft\Security Center" /v AntiVirusOverride /t REG_DWORD /d 1 /f
  • '<SYSTEM32>\reg.exe' add "HKLM\SOFTWARE\Microsoft\Security Center\Svc" /v AntiVirusOverride /t REG_DWORD /d 1 /f
  • '<SYSTEM32>\reg.exe' add "HKLM\SOFTWARE\Microsoft\Security Center" /v AntiVirusDisableNotify /t REG_DWORD /d 1 /f
  • '<SYSTEM32>\reg.exe' add "HKLM\SOFTWARE\Microsoft\Security Center\Svc" /v AntiVirusDisableNotify /t REG_DWORD /d 1 /f
  • '<SYSTEM32>\reg.exe' delete HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Run /v "Windows Defender" /f
  • '<SYSTEM32>\reg.exe' delete HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Run /v MSASCui /f
  • '<SYSTEM32>\reg.exe' add "HKLM\Software\Microsoft\Windows\CurrentVersion\Run" /v AS2014 /t REG_SZ /d "%PROGRAMDATA%\gqgygsgg\gqgygsgg.exe" /f
  • '<SYSTEM32>\sc.exe' config luafv start= disabled
  • '<SYSTEM32>\sc.exe' config wuauserv start= disabled
  • '<SYSTEM32>\sc.exe' config msmpsvc start= disabled
  • '<SYSTEM32>\sc.exe' config windefend start= disabled
  • '<SYSTEM32>\ping.exe' localhost -w 1000 -n 3
  • '<SYSTEM32>\sc.exe' StOp wscsvc
  • '<SYSTEM32>\sc.exe' StOp wuauserv
  • '<SYSTEM32>\sc.exe' StOp msmpsvc
  • '<SYSTEM32>\sc.exe' sToP WinDefend
  • '<SYSTEM32>\reg.exe' delete "HKLM\SOFTWARE\Microsoft\Windows NT\CurrentVersion\SPP\Clients" /va /f
  • '<SYSTEM32>\reg.exe' add "HKLM\SOFTWARE\Microsoft\Windows NT\CurrentVersion\SystemRestore" /v RPSessionInterval /t REG_DWORD /d 0 /f
  • '<SYSTEM32>\reg.exe' add "HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\policies\system" /v EnableVirtualization /t REG_DWORD /d 0 /f
  • '<SYSTEM32>\reg.exe' add "HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\policies\system" /v EnableLUA /t REG_DWORD /d 0 /f
  • '<SYSTEM32>\sc.exe' config wscsvc start= disabled
  • '<SYSTEM32>\reg.exe' add "HKLM\Software\Microsoft\Windows NT\CurrentVersion\Winlogon" /v Userinit /t REG_SZ /d "userinit.exe,%PROGRAMDATA%\gqgygsgg\gqgygsgg.exe -sm," /f

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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Use Dr.Web Anti-virus for macOS to run a full scan of your Mac.

After booting up, run a full scan of all disk partitions with Dr.Web Anti-virus for Linux.

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Download by serial number

  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