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Trojan.Siggen11.20368

Added to the Dr.Web virus database: 2020-11-16

Virus description added:

Technical Information

To ensure autorun and distribution
Creates or modifies the following files
  • <SYSTEM32>\tasks\gjaqdihpg
Malicious functions
To complicate detection of its presence in the operating system,
adds antivirus exclusion with following registry keys:
  • [<HKLM>\SOFTWARE\Wow6432Node\Microsoft\Windows Defender\Exclusions\Paths] '%WINDIR%\Temp\yPVdDRhPAWYBVhAG' = '00000000'
  • [<HKLM>\SOFTWARE\Wow6432Node\Policies\Microsoft\Windows Defender\Exclusions\Paths] '%ProgramFiles(x86)%\vkamTdSRgRUn' = '00000000'
  • [<HKLM>\SOFTWARE\Policies\Microsoft\Windows Defender\Exclusions\Paths] '%ProgramFiles(x86)%\iXBKSZNoQJjOC' = '00000000'
  • [<HKLM>\SOFTWARE\Policies\Microsoft\Windows Defender\Exclusions\Paths] '%ProgramFiles(x86)%\gCgWrTfsU' = '00000000'
  • [<HKLM>\SOFTWARE\Wow6432Node\Policies\Microsoft\Windows Defender\Exclusions\Paths] '%ProgramFiles(x86)%\iXBKSZNoQJjOC' = '00000000'
  • [<HKLM>\SOFTWARE\Policies\Microsoft\Windows Defender\Exclusions\Paths] '%ProgramFiles(x86)%\VarvGVgwvRdycuZsASR' = '00000000'
  • [<HKLM>\SOFTWARE\Wow6432Node\Policies\Microsoft\Windows Defender\Exclusions\Paths] '%ProgramFiles(x86)%\gCgWrTfsU' = '00000000'
  • [<HKLM>\SOFTWARE\Wow6432Node\Policies\Microsoft\Windows Defender\Exclusions\Paths] '%ProgramFiles(x86)%\VarvGVgwvRdycuZsASR' = '00000000'
  • [<HKLM>\SOFTWARE\Policies\Microsoft\Windows Defender\Exclusions\Paths] '%ProgramFiles(x86)%\DdEcoyuZtpXU2' = '00000000'
  • [<HKLM>\SOFTWARE\Policies\Microsoft\Windows Defender\Exclusions\Paths] '%ProgramFiles(x86)%\vkamTdSRgRUn' = '00000000'
  • [<HKLM>\SOFTWARE\Wow6432Node\Policies\Microsoft\Windows Defender\Exclusions\Paths] '%ProgramFiles(x86)%\DdEcoyuZtpXU2' = '00000000'
  • [<HKLM>\SOFTWARE\Wow6432Node\Microsoft\Windows Defender\Exclusions\Paths] '%ALLUSERSPROFILE%\dwFuKxKkvUhILFVB' = '00000000'
  • [<HKLM>\SOFTWARE\Wow6432Node\Microsoft\Windows Defender\Exclusions\Paths] '%ProgramFiles(x86)%\vkamTdSRgRUn' = '00000000'
  • [<HKLM>\SOFTWARE\Wow6432Node\Microsoft\Windows Defender\Exclusions\Paths] '%ProgramFiles(x86)%\iXBKSZNoQJjOC' = '00000000'
  • [<HKLM>\SOFTWARE\Wow6432Node\Microsoft\Windows Defender\Exclusions\Paths] '%ProgramFiles(x86)%\gCgWrTfsU' = '00000000'
  • [<HKLM>\SOFTWARE\Wow6432Node\Microsoft\Windows Defender\Exclusions\Paths] '%ProgramFiles(x86)%\VarvGVgwvRdycuZsASR' = '00000000'
  • [<HKLM>\SOFTWARE\Wow6432Node\Microsoft\Windows Defender\Exclusions\Paths] '%ProgramFiles(x86)%\DdEcoyuZtpXU2' = '00000000'
  • [<HKLM>\SOFTWARE\Policies\Microsoft\Windows Defender\Exclusions\Paths] '%WINDIR%\Temp\yPVdDRhPAWYBVhAG' = '00000000'
  • [<HKLM>\SOFTWARE\Wow6432Node\Policies\Microsoft\Windows Defender\Exclusions\Paths] '%WINDIR%\Temp\yPVdDRhPAWYBVhAG' = '00000000'
  • [<HKLM>\SOFTWARE\Wow6432Node\Microsoft\Windows Defender\Exclusions\Paths] '%TEMP%\dkLryxFdwXyFbsORl' = '00000000'
  • [<HKLM>\SOFTWARE\Wow6432Node\Policies\Microsoft\Windows Defender\Exclusions\Paths] '%ALLUSERSPROFILE%\dwFuKxKkvUhILFVB' = '00000000'
Creates and executes the following
  • '%WINDIR%\temp\ohnrfqflyyjkieom\nviuai.exe' /S /UPDATE
Modifies file system
Creates the following files
  • %WINDIR%\temp\ohnrfqflyyjkieom\nviuai.exe
  • %WINDIR%\temp\ypvddrhpawybvhag\yracogas\evylqksdboeibnry.wsf
Deletes the following files
  • <SYSTEM32>\tasks\gjaqdihpg
  • %WINDIR%\temp\ypvddrhpawybvhag\yracogas\evylqksdboeibnry.wsf
Network activity
TCP
HTTP GET requests
  • http://www.te###pdate.info/updates/ya/ytab_own_1/win/version.txt
  • http://www.te###pdate.info/updates/ya/ytab_own_1/win/update_e.jpg
UDP
  • DNS ASK te###pdate.info
Miscellaneous
Creates and executes the following
  • '%WINDIR%\syswow64\wscript.exe' "%WINDIR%\Temp\yPVdDRhPAWYBVhAG\YracOgaS\EvYlqksdBoEIBNRY.wsf"
  • '<SYSTEM32>\windowspowershell\v1.0\powershell.exe' -WindowStyle Hidden -EncodedCommand cwB0AGEAcgB0AC0AcAByAG8AYwBlAHMAcwAgAC0AVwBpAG4AZABvAHcAUwB0AHkAbABlACAASABpAGQAZABlAG4AIABnAHAAdQBwAGQAYQB0AGUALgBlAHgAZQAgAC8AZgBvAHIAYwBlAA==' (with hidden window)
  • '<SYSTEM32>\gpupdate.exe' /force' (with hidden window)
Executes the following
  • '%WINDIR%\syswow64\schtasks.exe' /CREATE /TN "gJaqDihpG" /SC once /ST 02:22:18 /F /RU "user" /TR "powershell -WindowStyle Hidden -EncodedCommand cwB0AGEAcgB0AC0AcAByAG8AYwBlAHMAcwAgAC0AVwBpAG4AZABvAHcAUwB0AHkAbABlACAASABpAGQAZ...
  • '%WINDIR%\syswow64\reg.exe' ADD "HKLM\SOFTWARE\Policies\Microsoft\Windows Defender\Exclusions\Paths" /f /v "%ProgramFiles(x86)%\VarvGVgwvRdycuZsASR" /t REG_DWORD /d 0 /reg:64
  • '%WINDIR%\syswow64\reg.exe' ADD "HKLM\SOFTWARE\Policies\Microsoft\Windows Defender\Exclusions\Paths" /f /v "%ProgramFiles(x86)%\gCgWrTfsU" /t REG_DWORD /d 0 /reg:32
  • '%WINDIR%\syswow64\reg.exe' ADD "HKLM\SOFTWARE\Policies\Microsoft\Windows Defender\Exclusions\Paths" /f /v "%ProgramFiles(x86)%\gCgWrTfsU" /t REG_DWORD /d 0 /reg:64
  • '%WINDIR%\syswow64\reg.exe' ADD "HKLM\SOFTWARE\Policies\Microsoft\Windows Defender\Exclusions\Paths" /f /v "%ProgramFiles(x86)%\iXBKSZNoQJjOC" /t REG_DWORD /d 0 /reg:32
  • '%WINDIR%\syswow64\reg.exe' ADD "HKLM\SOFTWARE\Policies\Microsoft\Windows Defender\Exclusions\Paths" /f /v "%ProgramFiles(x86)%\iXBKSZNoQJjOC" /t REG_DWORD /d 0 /reg:64
  • '%WINDIR%\syswow64\reg.exe' ADD "HKLM\SOFTWARE\Policies\Microsoft\Windows Defender\Exclusions\Paths" /f /v "%ProgramFiles(x86)%\vkamTdSRgRUn" /t REG_DWORD /d 0 /reg:32
  • '%WINDIR%\syswow64\reg.exe' ADD "HKLM\SOFTWARE\Policies\Microsoft\Windows Defender\Exclusions\Paths" /f /v "%ProgramFiles(x86)%\vkamTdSRgRUn" /t REG_DWORD /d 0 /reg:64
  • '%WINDIR%\syswow64\reg.exe' ADD "HKLM\SOFTWARE\Policies\Microsoft\Windows Defender\Exclusions\Paths" /f /v "%ALLUSERSPROFILE%\dwFuKxKkvUhILFVB" /t REG_DWORD /d 0 /reg:32
  • '%WINDIR%\syswow64\reg.exe' ADD "HKLM\SOFTWARE\Policies\Microsoft\Windows Defender\Exclusions\Paths" /f /v "%ALLUSERSPROFILE%\dwFuKxKkvUhILFVB" /t REG_DWORD /d 0 /reg:64
  • '%WINDIR%\syswow64\reg.exe' ADD "HKLM\SOFTWARE\Policies\Microsoft\Windows Defender\Exclusions\Paths" /f /v "%TEMP%\dkLryxFdwXyFbsORl" /t REG_DWORD /d 0 /reg:32
  • '%WINDIR%\syswow64\reg.exe' ADD "HKLM\SOFTWARE\Policies\Microsoft\Windows Defender\Exclusions\Paths" /f /v "%TEMP%\dkLryxFdwXyFbsORl" /t REG_DWORD /d 0 /reg:64
  • '%WINDIR%\syswow64\schtasks.exe' /END /TN "aJzzqEEspGvmZJTQU"
  • '%WINDIR%\syswow64\schtasks.exe' /END /TN "aJzzqEEspGvmZJTQU2"
  • '%WINDIR%\syswow64\schtasks.exe' /END /TN "YlPglVYfpnRfOzrOE2"
  • '%WINDIR%\syswow64\schtasks.exe' /DELETE /F /TN "aJzzqEEspGvmZJTQU2"
  • '%WINDIR%\syswow64\schtasks.exe' /END /TN "ThCSBPABMlekejKLc"
  • '%WINDIR%\syswow64\schtasks.exe' /DELETE /F /TN "ThCSBPABMlekejKLc"
  • '%WINDIR%\syswow64\schtasks.exe' /END /TN "ThCSBPABMlekejKLc2"
  • '%WINDIR%\syswow64\schtasks.exe' /DELETE /F /TN "ThCSBPABMlekejKLc2"
  • '%WINDIR%\syswow64\schtasks.exe' /END /TN "mabzIgNnRiJtJAZBv"
  • '%WINDIR%\syswow64\schtasks.exe' /DELETE /F /TN "mabzIgNnRiJtJAZBv"
  • '%WINDIR%\syswow64\schtasks.exe' /END /TN "mabzIgNnRiJtJAZBv2"
  • '%WINDIR%\syswow64\schtasks.exe' /DELETE /F /TN "mabzIgNnRiJtJAZBv2"
  • '%WINDIR%\syswow64\schtasks.exe' /END /TN "YlPglVYfpnRfOzrOE"
  • '%WINDIR%\syswow64\schtasks.exe' /DELETE /F /TN "YlPglVYfpnRfOzrOE"
  • '<SYSTEM32>\gpupdate.exe' /force
  • '%WINDIR%\syswow64\reg.exe' ADD "HKLM\SOFTWARE\Policies\Microsoft\Windows Defender\Exclusions\Paths" /f /v "%ProgramFiles(x86)%\VarvGVgwvRdycuZsASR" /t REG_DWORD /d 0 /reg:32
  • '%WINDIR%\syswow64\schtasks.exe' /DELETE /F /TN "aJzzqEEspGvmZJTQU"
  • '%WINDIR%\syswow64\reg.exe' ADD "HKLM\SOFTWARE\Policies\Microsoft\Windows Defender\Exclusions\Paths" /f /v "%ProgramFiles(x86)%\DdEcoyuZtpXU2" /t REG_DWORD /d 0 /reg:64
  • '%WINDIR%\syswow64\cmd.exe' /C copy nul "%WINDIR%\Temp\yPVdDRhPAWYBVhAG\YracOgaS\EvYlqksdBoEIBNRY.wsf"
  • '%WINDIR%\syswow64\schtasks.exe' /run /I /tn "gJaqDihpG"
  • '<SYSTEM32>\taskeng.exe' {8BABB52F-E8F0-4B5D-BD9E-D29941FD998E} S-1-5-21-1960123792-2022915161-3775307078-1001:getmoeshceqm\user:Interactive:[1]
  • '<SYSTEM32>\windowspowershell\v1.0\powershell.exe' -WindowStyle Hidden -EncodedCommand cwB0AGEAcgB0AC0AcAByAG8AYwBlAHMAcwAgAC0AVwBpAG4AZABvAHcAUwB0AHkAbABlACAASABpAGQAZABlAG4AIABnAHAAdQBwAGQAYQB0AGUALgBlAHgAZQAgAC8AZgBvAHIAYwBlAA==
  • '%WINDIR%\syswow64\schtasks.exe' /DELETE /F /TN "gJaqDihpG"
  • '%WINDIR%\syswow64\cmd.exe' /C REG ADD "HKLM\SOFTWARE\Microsoft\Windows Defender\Exclusions\Paths" /f /v "%WINDIR%\Temp\yPVdDRhPAWYBVhAG" /t REG_DWORD /d 0 /reg:32
  • '%WINDIR%\syswow64\reg.exe' ADD "HKLM\SOFTWARE\Microsoft\Windows Defender\Exclusions\Paths" /f /v "%WINDIR%\Temp\yPVdDRhPAWYBVhAG" /t REG_DWORD /d 0 /reg:32
  • '%WINDIR%\syswow64\cmd.exe' /C REG ADD "HKLM\SOFTWARE\Microsoft\Windows Defender\Exclusions\Paths" /f /v "%WINDIR%\Temp\yPVdDRhPAWYBVhAG" /t REG_DWORD /d 0 /reg:64
  • '%WINDIR%\syswow64\reg.exe' ADD "HKLM\SOFTWARE\Microsoft\Windows Defender\Exclusions\Paths" /f /v "%WINDIR%\Temp\yPVdDRhPAWYBVhAG" /t REG_DWORD /d 0 /reg:64
  • '%WINDIR%\syswow64\cmd.exe' /C REG ADD "HKLM\SOFTWARE\Policies\Microsoft\Windows Defender\Exclusions\Paths" /f /v "%WINDIR%\Temp\yPVdDRhPAWYBVhAG" /t REG_DWORD /d 0 /reg:32
  • '%WINDIR%\syswow64\reg.exe' ADD "HKLM\SOFTWARE\Policies\Microsoft\Windows Defender\Exclusions\Paths" /f /v "%WINDIR%\Temp\yPVdDRhPAWYBVhAG" /t REG_DWORD /d 0 /reg:32
  • '%WINDIR%\syswow64\cmd.exe' /C REG ADD "HKLM\SOFTWARE\Policies\Microsoft\Windows Defender\Exclusions\Paths" /f /v "%WINDIR%\Temp\yPVdDRhPAWYBVhAG" /t REG_DWORD /d 0 /reg:64
  • '%WINDIR%\syswow64\reg.exe' ADD "HKLM\SOFTWARE\Policies\Microsoft\Windows Defender\Exclusions\Paths" /f /v "%WINDIR%\Temp\yPVdDRhPAWYBVhAG" /t REG_DWORD /d 0 /reg:64
  • '%WINDIR%\syswow64\reg.exe' ADD "HKLM\SOFTWARE\Microsoft\Windows Defender\Exclusions\Paths" /f /v "%ProgramFiles(x86)%\DdEcoyuZtpXU2" /t REG_DWORD /d 0 /reg:32
  • '%WINDIR%\syswow64\reg.exe' ADD "HKLM\SOFTWARE\Microsoft\Windows Defender\Exclusions\Paths" /f /v "%TEMP%\dkLryxFdwXyFbsORl" /t REG_DWORD /d 0 /reg:64
  • '%WINDIR%\syswow64\reg.exe' ADD "HKLM\SOFTWARE\Microsoft\Windows Defender\Exclusions\Paths" /f /v "%ProgramFiles(x86)%\DdEcoyuZtpXU2" /t REG_DWORD /d 0 /reg:64
  • '%WINDIR%\syswow64\reg.exe' ADD "HKLM\SOFTWARE\Microsoft\Windows Defender\Exclusions\Paths" /f /v "%ProgramFiles(x86)%\VarvGVgwvRdycuZsASR" /t REG_DWORD /d 0 /reg:32
  • '%WINDIR%\syswow64\reg.exe' ADD "HKLM\SOFTWARE\Microsoft\Windows Defender\Exclusions\Paths" /f /v "%ProgramFiles(x86)%\VarvGVgwvRdycuZsASR" /t REG_DWORD /d 0 /reg:64
  • '%WINDIR%\syswow64\reg.exe' ADD "HKLM\SOFTWARE\Microsoft\Windows Defender\Exclusions\Paths" /f /v "%ProgramFiles(x86)%\gCgWrTfsU" /t REG_DWORD /d 0 /reg:32
  • '%WINDIR%\syswow64\reg.exe' ADD "HKLM\SOFTWARE\Microsoft\Windows Defender\Exclusions\Paths" /f /v "%ProgramFiles(x86)%\gCgWrTfsU" /t REG_DWORD /d 0 /reg:64
  • '%WINDIR%\syswow64\reg.exe' ADD "HKLM\SOFTWARE\Microsoft\Windows Defender\Exclusions\Paths" /f /v "%ProgramFiles(x86)%\iXBKSZNoQJjOC" /t REG_DWORD /d 0 /reg:32
  • '%WINDIR%\syswow64\reg.exe' ADD "HKLM\SOFTWARE\Microsoft\Windows Defender\Exclusions\Paths" /f /v "%ProgramFiles(x86)%\iXBKSZNoQJjOC" /t REG_DWORD /d 0 /reg:64
  • '%WINDIR%\syswow64\reg.exe' ADD "HKLM\SOFTWARE\Microsoft\Windows Defender\Exclusions\Paths" /f /v "%ProgramFiles(x86)%\vkamTdSRgRUn" /t REG_DWORD /d 0 /reg:32
  • '%WINDIR%\syswow64\reg.exe' ADD "HKLM\SOFTWARE\Microsoft\Windows Defender\Exclusions\Paths" /f /v "%ProgramFiles(x86)%\vkamTdSRgRUn" /t REG_DWORD /d 0 /reg:64
  • '%WINDIR%\syswow64\reg.exe' ADD "HKLM\SOFTWARE\Microsoft\Windows Defender\Exclusions\Paths" /f /v "%ALLUSERSPROFILE%\dwFuKxKkvUhILFVB" /t REG_DWORD /d 0 /reg:32
  • '%WINDIR%\syswow64\reg.exe' ADD "HKLM\SOFTWARE\Microsoft\Windows Defender\Exclusions\Paths" /f /v "%ALLUSERSPROFILE%\dwFuKxKkvUhILFVB" /t REG_DWORD /d 0 /reg:64
  • '%WINDIR%\syswow64\reg.exe' ADD "HKLM\SOFTWARE\Microsoft\Windows Defender\Exclusions\Paths" /f /v "%TEMP%\dkLryxFdwXyFbsORl" /t REG_DWORD /d 0 /reg:32
  • '%WINDIR%\syswow64\reg.exe' ADD "HKLM\SOFTWARE\Policies\Microsoft\Windows Defender\Exclusions\Paths" /f /v "%ProgramFiles(x86)%\DdEcoyuZtpXU2" /t REG_DWORD /d 0 /reg:32
  • '%WINDIR%\syswow64\schtasks.exe' /DELETE /F /TN "YlPglVYfpnRfOzrOE2"

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.
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    • 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);
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