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Trojan.Siggen31.56816
Added to the Dr.Web virus database:
2025-09-17
Virus description added:
2025-09-18
Technical Information
To ensure autorun and distribution
Modifies the following registry keys
[HKCU\Software\Microsoft\Windows\CurrentVersion\Run] 'Realtek HD Audio Universal Service' = '%APPDATA%\Microsoft\Protect\SecurityHealthSystray.exe'
Malicious functions
To complicate detection of its presence in the operating system,
adds antivirus exclusion:
'<SYSTEM32>\windowspowershell\v1.0\powershell.exe' -Command Add-MpPreference -ExclusionPath %TEMP%\app_1758044462243891500.exe
Executes the following
'<SYSTEM32>\taskkill.exe' /F /IM firefox.exe
Terminates or attempts to terminate
the following user processes:
Modifies file system
Creates the following files
%TEMP%\app_1758044462243891500.exe
nul
%APPDATA%\microsoft\protect\securityhealthsystray.exe
%TEMP%\vryxen\socialmedias\socials.zip
Sets the 'hidden' attribute to the following files
%TEMP%\app_1758044462243891500.exe
%APPDATA%\microsoft\protect\securityhealthsystray.exe
Miscellaneous
Searches for the following windows
ClassName: '' WindowName: ''
Creates and executes the following
'%TEMP%\app_1758044462243891500.exe'
Executes the following
'<SYSTEM32>\cmd.exe' /C tasklist /FI "IMAGENAME eq 360chrome.exe"
'<SYSTEM32>\tasklist.exe' /FI "IMAGENAME eq 360chrome.exe"
'<SYSTEM32>\cmd.exe' /C tasklist /FI "IMAGENAME eq 360se.exe"
'<SYSTEM32>\tasklist.exe' /FI "IMAGENAME eq 360se.exe"
'<SYSTEM32>\cmd.exe' /C tasklist /FI "IMAGENAME eq avant.exe"
'<SYSTEM32>\tasklist.exe' /FI "IMAGENAME eq avant.exe"
'<SYSTEM32>\cmd.exe' /C tasklist /FI "IMAGENAME eq brave.exe"
'<SYSTEM32>\tasklist.exe' /FI "IMAGENAME eq brave.exe"
'<SYSTEM32>\cmd.exe' /C tasklist /FI "IMAGENAME eq chrome.exe"
'<SYSTEM32>\tasklist.exe' /FI "IMAGENAME eq chrome.exe"
'<SYSTEM32>\cmd.exe' /C tasklist /FI "IMAGENAME eq chromium.exe"
'<SYSTEM32>\tasklist.exe' /FI "IMAGENAME eq chromium.exe"
'<SYSTEM32>\cmd.exe' /C tasklist /FI "IMAGENAME eq citrio.exe"
'<SYSTEM32>\tasklist.exe' /FI "IMAGENAME eq citrio.exe"
'<SYSTEM32>\cmd.exe' /C tasklist /FI "IMAGENAME eq comodo_dragon.exe"
'<SYSTEM32>\tasklist.exe' /FI "IMAGENAME eq comodo_dragon.exe"
'<SYSTEM32>\cmd.exe' /C tasklist /FI "IMAGENAME eq coolnovo.exe"
'<SYSTEM32>\tasklist.exe' /FI "IMAGENAME eq coolnovo.exe"
'<SYSTEM32>\cmd.exe' /C tasklist /FI "IMAGENAME eq coowon.exe"
'<SYSTEM32>\tasklist.exe' /FI "IMAGENAME eq coowon.exe"
'<SYSTEM32>\cmd.exe' /C tasklist /FI "IMAGENAME eq cyberfox.exe"
'<SYSTEM32>\tasklist.exe' /FI "IMAGENAME eq cyberfox.exe"
'<SYSTEM32>\cmd.exe' /C tasklist /FI "IMAGENAME eq deepnet.exe"
'<SYSTEM32>\tasklist.exe' /FI "IMAGENAME eq deepnet.exe"
'<SYSTEM32>\cmd.exe' /C tasklist /FI "IMAGENAME eq dooble.exe"
'<SYSTEM32>\tasklist.exe' /FI "IMAGENAME eq dooble.exe"
'<SYSTEM32>\cmd.exe' /C tasklist /FI "IMAGENAME eq epic.exe"
'<SYSTEM32>\tasklist.exe' /FI "IMAGENAME eq epic.exe"
'<SYSTEM32>\cmd.exe' /C tasklist /FI "IMAGENAME eq firefox.exe"
'<SYSTEM32>\tasklist.exe' /FI "IMAGENAME eq firefox.exe"
'<SYSTEM32>\cmd.exe' /C taskkill /F /IM firefox.exe
'<SYSTEM32>\cmd.exe' /C tasklist /FI "IMAGENAME eq iceweasel.exe"
'<SYSTEM32>\tasklist.exe' /FI "IMAGENAME eq iceweasel.exe"
'<SYSTEM32>\cmd.exe' /C tasklist /FI "IMAGENAME eq iridium.exe"
'<SYSTEM32>\tasklist.exe' /FI "IMAGENAME eq iridium.exe"
'<SYSTEM32>\cmd.exe' /C tasklist /FI "IMAGENAME eq k-meleon.exe"
'<SYSTEM32>\tasklist.exe' /FI "IMAGENAME eq k-meleon.exe"
'<SYSTEM32>\cmd.exe' /C tasklist /FI "IMAGENAME eq maxthon.exe"
'<SYSTEM32>\tasklist.exe' /FI "IMAGENAME eq maxthon.exe"
'<SYSTEM32>\cmd.exe' /C tasklist /FI "IMAGENAME eq msedge.exe"
'<SYSTEM32>\tasklist.exe' /FI "IMAGENAME eq msedge.exe"
'<SYSTEM32>\cmd.exe' /C tasklist /FI "IMAGENAME eq netscape.exe"
'<SYSTEM32>\tasklist.exe' /FI "IMAGENAME eq netscape.exe"
'<SYSTEM32>\cmd.exe' /C tasklist /FI "IMAGENAME eq opera.exe"
'<SYSTEM32>\tasklist.exe' /FI "IMAGENAME eq opera.exe"
'<SYSTEM32>\cmd.exe' /C tasklist /FI "IMAGENAME eq palemoon.exe"
'<SYSTEM32>\tasklist.exe' /FI "IMAGENAME eq palemoon.exe"
'<SYSTEM32>\cmd.exe' /C tasklist /FI "IMAGENAME eq safari.exe"
'<SYSTEM32>\tasklist.exe' /FI "IMAGENAME eq safari.exe"
'<SYSTEM32>\cmd.exe' /C tasklist /FI "IMAGENAME eq seamonkey.exe"
'<SYSTEM32>\tasklist.exe' /FI "IMAGENAME eq seamonkey.exe"
'<SYSTEM32>\cmd.exe' /C tasklist /FI "IMAGENAME eq sleipnir.exe"
'<SYSTEM32>\tasklist.exe' /FI "IMAGENAME eq sleipnir.exe"
'<SYSTEM32>\cmd.exe' /C tasklist /FI "IMAGENAME eq sputnik.exe"
'<SYSTEM32>\tasklist.exe' /FI "IMAGENAME eq sputnik.exe"
'<SYSTEM32>\cmd.exe' /C tasklist /FI "IMAGENAME eq torch.exe"
'<SYSTEM32>\tasklist.exe' /FI "IMAGENAME eq torch.exe"
'<SYSTEM32>\cmd.exe' /C tasklist /FI "IMAGENAME eq ucbrowser.exe"
'<SYSTEM32>\tasklist.exe' /FI "IMAGENAME eq ucbrowser.exe"
'<SYSTEM32>\cmd.exe' /C tasklist /FI "IMAGENAME eq vivaldi.exe"
'<SYSTEM32>\tasklist.exe' /FI "IMAGENAME eq vivaldi.exe"
'<SYSTEM32>\cmd.exe' /C tasklist /FI "IMAGENAME eq waterfox.exe"
'<SYSTEM32>\tasklist.exe' /FI "IMAGENAME eq waterfox.exe"
'<SYSTEM32>\cmd.exe' /C tasklist /FI "IMAGENAME eq yandex.exe"
'<SYSTEM32>\tasklist.exe' /FI "IMAGENAME eq yandex.exe"
'<SYSTEM32>\cmd.exe' /C tasklist /FI "IMAGENAME eq yandexbrowser.exe"
'<SYSTEM32>\tasklist.exe' /FI "IMAGENAME eq yandexbrowser.exe"
'<SYSTEM32>\cmd.exe' /C tasklist /FI "IMAGENAME eq operagx.exe"
'<SYSTEM32>\tasklist.exe' /FI "IMAGENAME eq operagx.exe"
'<SYSTEM32>\attrib.exe' +h +s %TEMP%\app_1758044462243891500.exe
'<SYSTEM32>\reagentc.exe' /disable
'<SYSTEM32>\tasklist.exe'
'<SYSTEM32>\attrib.exe' +h +s %APPDATA%\Microsoft\Protect\SecurityHealthSystray.exe
'<SYSTEM32>\attrib.exe' +h +s %TEMP%\app_1758044462243891500.exe' (with hidden window)
'<SYSTEM32>\tasklist.exe' ' (with hidden window)
'<SYSTEM32>\windowspowershell\v1.0\powershell.exe' -Command Add-MpPreference -ExclusionPath %TEMP%\app_1758044462243891500.exe' (with hidden window)
Curing recommendations
Windows
macOS
Linux
Android
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 .
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.
Use Dr.Web Anti-virus for macOS to run a full scan of your Mac.
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.
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
Download Dr.Web for Android
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Renew your trial license in AppGallery/on Google Pay
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