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Trojan.Siggen32.2378
Added to the Dr.Web virus database:
2025-10-24
Virus description added:
2025-10-26
Technical Information
To ensure autorun and distribution
Sets the following service settings
[HKLM\SYSTEM\CurrentControlSet\Services\AdskNLM] 'Start' = '00000002'
[HKLM\SYSTEM\CurrentControlSet\Services\AdskNLM] 'ImagePath' = '"%CommonProgramFiles(x86)%\Autodesk Shared\Network License Manager\lmgrd.exe"'
Creates the following services
'AdskNLM' %CommonProgramFiles(x86)%\Autodesk Shared�etwork License Manager\lmgrd.exe
'AdskNLM' %CommonProgramFiles(x86)%\Autodesk Shared\Network License Manager\lmgrd.exe
Malicious functions
Executes the following
'<SYSTEM32>\taskkill.exe' /im AdskLicensingAgent.exe /f
Modifies file system
Creates the following files
%TEMP%\adsk-nlm\createlic.cmd
%TEMP%\adsk-nlm\nlm.mst
%TEMP%\adsk-nlm\nlm11.16.2.0_ipv4_ipv6_win64.msi
%TEMP%\adsk-nlm\licenses.lic
%TEMP%\adsk-nlm\version.dll
%TEMP%\adsk-nlm\adskflex.exe
%WINDIR%\installer\d6d32.mst
%WINDIR%\temp\~df9ad6e81d754a0baf.tmp
%WINDIR%\installer\sourcehash{4be91685-1632-47fc-b563-a8a542c6664c}
%WINDIR%\temp\~df35b9101a585ce14d.tmp
%WINDIR%\temp\~df07671461c7fcd36b.tmp
%WINDIR%\temp\~df0c2f914538ba4a81.tmp
%CommonProgramFiles(x86)%\autodesk shared\network license manager\adskflex.exe
%CommonProgramFiles(x86)%\autodesk shared\network license manager\lmgrd.exe
%CommonProgramFiles(x86)%\autodesk shared\network license manager\lmtools.exe
%CommonProgramFiles(x86)%\autodesk shared\network license manager\lmutil.exe
%CommonProgramFiles(x86)%\autodesk shared\network license manager\licenseadministration.pdf
%APPDATA%\microsoft\installer\{4be91685-1632-47fc-b563-a8a542c6664c}\lmtools.exe
%APPDATA%\microsoft\windows\start menu\programs\autodesk\network license manager\lmtools utility.lnk
%APPDATA%\microsoft\installer\{4be91685-1632-47fc-b563-a8a542c6664c}\nlm.mst
%WINDIR%\temp\~dfb4a43ae3ebf1d6b8.tmp
%WINDIR%\temp\~dfed75214f7fc64a81.tmp
%WINDIR%\temp\~dfad2a2c2080181697.tmp
%WINDIR%\temp\~dfb47a622894589a7a.tmp
%WINDIR%\temp\~dfd6f3b0b11c79f7ca.tmp
%WINDIR%\temp\~dfd59b02e2b987008c.tmp
%WINDIR%\temp\~dfdd7e682127efd319.tmp
%WINDIR%\temp\~dfed3e336260e10d2b.tmp
%TEMP%\adsk-nlm\fstln.txt
%CommonProgramFiles(x86)%\autodesk shared\network license manager\licenses.lic
%CommonProgramFiles(x86)%\autodesk shared\adsklicensing\current\adsklicensingagent\version.dll
Deletes following files that it created itself
%WINDIR%\installer\d6d32.mst
%TEMP%\adsk-nlm\adskflex.exe
%TEMP%\adsk-nlm\createlic.cmd
%TEMP%\adsk-nlm\fstln.txt
%TEMP%\adsk-nlm\licenses.lic
%TEMP%\adsk-nlm\nlm.mst
%TEMP%\adsk-nlm\nlm11.16.2.0_ipv4_ipv6_win64.msi
%TEMP%\adsk-nlm\version.dll
Network activity
Connects to
'<LOCALNET>..33.9':27000
'<LOCALNET>..33.9':27001
'<LOCALNET>..33.9':27002
'<LOCALNET>..33.9':27003
'<LOCALNET>..33.9':27004
'<LOCALNET>..33.9':27005
'<LOCALNET>..33.9':27006
'<LOCALNET>..33.9':27007
'<LOCALNET>..33.9':27008
'<LOCALNET>..33.9':27009
'localhost':49705
'localhost':27000
TCP
Other
'<LOCALNET>..33.9':27000
'<LOCALNET>..33.9':49704
'localhost':27000
'localhost':49707
Miscellaneous
Searches for the following windows
ClassName: '' WindowName: ''
Creates and executes the following
'%CommonProgramFiles(x86)%\autodesk shared\network license manager\lmgrd.exe'
'%CommonProgramFiles(x86)%\autodesk shared\network license manager\lmgrd.exe' -c "%CommonProgramFiles(x86)%\Autodesk Shared\Network License Manager\licenses.lic" -z -s
'%CommonProgramFiles(x86)%\autodesk shared\network license manager\adskflex.exe' -T wxrdzor 11.16 -1 -c ";%CommonProgramFiles(x86)%\Autodesk Shared\Network License Manager\licenses.lic;" -lmgrd_port 6978 -srv A2qnPz4OfojN5VzBHysoNKwiT9W55tLa2swaa4PfGeZj43D2qjF81PJYkeFa0E0 -...
Restarts the analyzed sample
Executes the following
'<SYSTEM32>\sc.exe' stop AdskNLM
'<SYSTEM32>\wbem\wmic.exe' product where name="Autodesk Network License Manager" call uninstall /nointeractive
'<SYSTEM32>\msiexec.exe' /i "%TEMP%\Adsk-NLM\nlm11.16.2.0_ipv4_ipv6_win64.msi" TRANSFORMS=nlm.mst INSTALLDIR1="%CommonProgramFiles(x86)%\Autodesk Shared\Network License Manager" /qn
'<SYSTEM32>\cmd.exe' /c echo D | xcopy /y /r "%TEMP%\Adsk-NLM\adskflex.exe" "%CommonProgramFiles(x86)%\Autodesk Shared\Network License Manager"
'<SYSTEM32>\cmd.exe' /S /D /c" echo D "
'<SYSTEM32>\xcopy.exe' /y /r "%TEMP%\Adsk-NLM\adskflex.exe" "%CommonProgramFiles(x86)%\Autodesk Shared\Network License Manager"
'<SYSTEM32>\cmd.exe' /c ""%TEMP%\Adsk-NLM\createlic.cmd" "
'<SYSTEM32>\cmd.exe' /c wmic path Win32_NetworkAdapter where "PNPDeviceID like '%%USB%%' AND AdapterTypeID='0'" get MacAddress,AdapterType
'<SYSTEM32>\wbem\wmic.exe' path Win32_NetworkAdapter where "PNPDeviceID like '%%USB%%' AND AdapterTypeID='0'" get MacAddress,AdapterType
'<SYSTEM32>\cmd.exe' /c wmic path Win32_NetworkAdapter where "PNPDeviceID like '%%PCI%%' AND AdapterTypeID='0'" get MacAddress,AdapterType
'<SYSTEM32>\wbem\wmic.exe' path Win32_NetworkAdapter where "PNPDeviceID like '%%PCI%%' AND AdapterTypeID='0'" get MacAddress,AdapterType
'<SYSTEM32>\sc.exe' stop AdskLicensingService
'<SYSTEM32>\cmd.exe' /c echo D | xcopy /y /r "%TEMP%\Adsk-NLM\version.dll" "%CommonProgramFiles(x86)%\Autodesk Shared\AdskLicensing\Current\AdskLicensingAgent"
'<SYSTEM32>\xcopy.exe' /y /r "%TEMP%\Adsk-NLM\version.dll" "%CommonProgramFiles(x86)%\Autodesk Shared\AdskLicensing\Current\AdskLicensingAgent"
'<SYSTEM32>\sc.exe' start AdskLicensingService
'<SYSTEM32>\sc.exe' create AdskNLM binPath= "\"%CommonProgramFiles(x86)%\Autodesk Shared\Network License Manager\lmgrd.exe\"" start= auto depend= WinMgmt/+NetworkProvider obj= "NT AUTHORITY\LocalService" displayna...
'<SYSTEM32>\reg.exe' add "HKLM\SOFTWARE\FLEXlm License Manager\AdskNLM" /v "Lmgrd" /d "%CommonProgramFiles(x86)%\Autodesk Shared\Network License Manager\lmgrd.exe" /f
'<SYSTEM32>\reg.exe' add "HKLM\SOFTWARE\FLEXlm License Manager\AdskNLM" /v "License" /d "%CommonProgramFiles(x86)%\Autodesk Shared\Network License Manager\licenses.lic" /f
'<SYSTEM32>\reg.exe' add "HKLM\SOFTWARE\FLEXlm License Manager\AdskNLM" /v "Service" /d "AdskNLM" /f
'<SYSTEM32>\reg.exe' add "HKLM\SOFTWARE\WOW6432Node\FLEXlm License Manager\AdskNLM" /v "Lmgrd" /d "%CommonProgramFiles(x86)%\Autodesk Shared\Network License Manager\lmgrd.exe" /f
'<SYSTEM32>\reg.exe' add "HKLM\SOFTWARE\WOW6432Node\FLEXlm License Manager\AdskNLM" /v "License" /d "%CommonProgramFiles(x86)%\Autodesk Shared\Network License Manager\licenses.lic" /f
'<SYSTEM32>\reg.exe' add "HKLM\SOFTWARE\WOW6432Node\FLEXlm License Manager\AdskNLM" /v "Service" /d "AdskNLM" /f
'<SYSTEM32>\reg.exe' add "HKCU\SOFTWARE\FLEXlm License Manager" /v "ADSKFLEX_LICENSE_FILE" /d "@localhost" /f
'<SYSTEM32>\sc.exe' start AdskNLM
'<SYSTEM32>\sc.exe' stop AdskNLM' (with hidden window)
'<SYSTEM32>\wbem\wmic.exe' product where name="Autodesk Network License Manager" call uninstall /nointeractive' (with hidden window)
'<SYSTEM32>\msiexec.exe' /i "%TEMP%\Adsk-NLM\nlm11.16.2.0_ipv4_ipv6_win64.msi" TRANSFORMS=nlm.mst INSTALLDIR1="%CommonProgramFiles(x86)%\Autodesk Shared\Network License Manager" /qn' (with hidden window)
'<SYSTEM32>\cmd.exe' /c echo D | xcopy /y /r "%TEMP%\Adsk-NLM\adskflex.exe" "%CommonProgramFiles(x86)%\Autodesk Shared\Network License Manager"' (with hidden window)
'<SYSTEM32>\cmd.exe' /c ""%TEMP%\Adsk-NLM\createlic.cmd" "' (with hidden window)
'<SYSTEM32>\sc.exe' stop AdskLicensingService' (with hidden window)
'<SYSTEM32>\taskkill.exe' /im AdskLicensingAgent.exe /f' (with hidden window)
'<SYSTEM32>\cmd.exe' /c echo D | xcopy /y /r "%TEMP%\Adsk-NLM\version.dll" "%CommonProgramFiles(x86)%\Autodesk Shared\AdskLicensing\Current\AdskLicensingAgent"' (with hidden window)
'<SYSTEM32>\sc.exe' start AdskLicensingService' (with hidden window)
'<SYSTEM32>\sc.exe' create AdskNLM binPath= "\"%CommonProgramFiles(x86)%\Autodesk Shared\Network License Manager\lmgrd.exe\"" start= auto depend= WinMgmt/+NetworkProvider obj= "NT AUTHORITY\LocalService" displayna...' (with hidden window)
'<SYSTEM32>\reg.exe' add "HKLM\SOFTWARE\FLEXlm License Manager\AdskNLM" /v "Lmgrd" /d "%CommonProgramFiles(x86)%\Autodesk Shared\Network License Manager\lmgrd.exe" /f' (with hidden window)
'<SYSTEM32>\reg.exe' add "HKLM\SOFTWARE\FLEXlm License Manager\AdskNLM" /v "License" /d "%CommonProgramFiles(x86)%\Autodesk Shared\Network License Manager\licenses.lic" /f' (with hidden window)
'<SYSTEM32>\reg.exe' add "HKLM\SOFTWARE\FLEXlm License Manager\AdskNLM" /v "Service" /d "AdskNLM" /f' (with hidden window)
'<SYSTEM32>\reg.exe' add "HKLM\SOFTWARE\WOW6432Node\FLEXlm License Manager\AdskNLM" /v "Lmgrd" /d "%CommonProgramFiles(x86)%\Autodesk Shared\Network License Manager\lmgrd.exe" /f' (with hidden window)
'<SYSTEM32>\reg.exe' add "HKLM\SOFTWARE\WOW6432Node\FLEXlm License Manager\AdskNLM" /v "License" /d "%CommonProgramFiles(x86)%\Autodesk Shared\Network License Manager\licenses.lic" /f' (with hidden window)
'<SYSTEM32>\reg.exe' add "HKLM\SOFTWARE\WOW6432Node\FLEXlm License Manager\AdskNLM" /v "Service" /d "AdskNLM" /f' (with hidden window)
'<SYSTEM32>\reg.exe' add "HKCU\SOFTWARE\FLEXlm License Manager" /v "ADSKFLEX_LICENSE_FILE" /d "@localhost" /f' (with hidden window)
'<SYSTEM32>\sc.exe' start AdskNLM' (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
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