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Trojan.Siggen32.5037

Added to the Dr.Web virus database: 2025-11-02

Virus description added: 2025-11-04

Technical Information

To ensure autorun and distribution

Creates or modifies the following files

%APPDATA%\microsoft\windows\start menu\programs\startup\xmr_startup.bat

Sets the following service settings

[HKLM\SYSTEM\CurrentControlSet\Services\xxx] 'Start' = '00000002'
[HKLM\SYSTEM\CurrentControlSet\Services\xxx] 'ImagePath' = '%WINDIR%\xmr\nssm.exe'
[HKLM\SYSTEM\CurrentControlSet\Services\WinRing0_1_2_0] 'ImagePath' = '%WINDIR%\xmr\WinRing0x64.sys'

Creates the following services

'xxx' %WINDIR%\xmr\nssm.exe
'WinRing0_1_2_0' %WINDIR%\xmr\WinRing0x64.sys

Modifies file system

Creates the following files

%TEMP%\_mei34042\vcruntime140.dll
%TEMP%\_mei34042\vcruntime140_1.dll
%TEMP%\_mei34042\_asyncio.pyd
%TEMP%\_mei34042\_bz2.pyd
%TEMP%\_mei34042\_ctypes.pyd
%TEMP%\_mei34042\_decimal.pyd
%TEMP%\_mei34042\_hashlib.pyd
%TEMP%\_mei34042\_lzma.pyd
%TEMP%\_mei34042\_multiprocessing.pyd
%TEMP%\_mei34042\_overlapped.pyd
%TEMP%\_mei34042\_queue.pyd
%TEMP%\_mei34042\_socket.pyd
%TEMP%\_mei34042\_ssl.pyd
%TEMP%\_mei34042\_wmi.pyd
%TEMP%\_mei34042\base_library.zip
%TEMP%\_mei34042\certifi\cacert.pem
%TEMP%\_mei34042\charset_normalizer\md.cp312-win_amd64.pyd
%TEMP%\_mei34042\charset_normalizer\md__mypyc.cp312-win_amd64.pyd
%TEMP%\_mei34042\libcrypto-3.dll
%TEMP%\_mei34042\libffi-8.dll
%TEMP%\_mei34042\libssl-3.dll
%TEMP%\_mei34042\pyexpat.pyd
%TEMP%\_mei34042\python312.dll
%TEMP%\_mei34042\pywin32_system32\pywintypes312.dll
%TEMP%\_mei34042\select.pyd
%TEMP%\_mei34042\setuptools\_vendor\importlib_metadata-8.0.0.dist-info\installer
%TEMP%\_mei34042\setuptools\_vendor\importlib_metadata-8.0.0.dist-info\license
%TEMP%\_mei34042\setuptools\_vendor\importlib_metadata-8.0.0.dist-info\metadata
%TEMP%\_mei34042\setuptools\_vendor\importlib_metadata-8.0.0.dist-info\record
%TEMP%\_mei34042\setuptools\_vendor\importlib_metadata-8.0.0.dist-info\wheel
%TEMP%\_mei34042\setuptools\_vendor\importlib_metadata-8.0.0.dist-info\top_level.txt
%TEMP%\_mei34042\setuptools\_vendor\jaraco\text\lorem ipsum.txt
%TEMP%\_mei34042\unicodedata.pyd
%TEMP%\_mei34042\win32\_win32sysloader.pyd
%TEMP%\_mei34042\win32\perfmon.pyd
%TEMP%\_mei34042\win32\servicemanager.pyd
%TEMP%\_mei34042\win32\win32api.pyd
%TEMP%\_mei34042\win32\win32evtlog.pyd
%TEMP%\_mei34042\win32\win32gui.pyd
%TEMP%\_mei34042\win32\win32security.pyd
%TEMP%\_mei34042\win32\win32service.pyd
%WINDIR%\xmr\winring0x64.sys
%WINDIR%\xmr\config.json
%WINDIR%\xmr\xmrig.exe
%WINDIR%\xmr\nssm.exe
%TEMP%\delete_self.bat
nul

Sets the 'hidden' attribute to the following files

%WINDIR%\xmr\winring0x64.sys
%WINDIR%\xmr\config.json
%WINDIR%\xmr\xmrig.exe
%WINDIR%\xmr\nssm.exe
%APPDATA%\microsoft\windows\start menu\programs\startup\xmr_startup.bat

Deletes following files that it created itself

%TEMP%\_mei34042\base_library.zip
%TEMP%\_mei34042\certifi\cacert.pem
%TEMP%\_mei34042\charset_normalizer\md.cp312-win_amd64.pyd
%TEMP%\_mei34042\charset_normalizer\md__mypyc.cp312-win_amd64.pyd
%TEMP%\_mei34042\libcrypto-3.dll
%TEMP%\_mei34042\libffi-8.dll
%TEMP%\_mei34042\libssl-3.dll
%TEMP%\_mei34042\pyexpat.pyd
%TEMP%\_mei34042\python312.dll
%TEMP%\_mei34042\pywin32_system32\pywintypes312.dll
%TEMP%\_mei34042\select.pyd
%TEMP%\_mei34042\setuptools\_vendor\importlib_metadata-8.0.0.dist-info\installer
%TEMP%\_mei34042\setuptools\_vendor\importlib_metadata-8.0.0.dist-info\license
%TEMP%\_mei34042\setuptools\_vendor\importlib_metadata-8.0.0.dist-info\metadata
%TEMP%\_mei34042\setuptools\_vendor\importlib_metadata-8.0.0.dist-info\record
%TEMP%\_mei34042\setuptools\_vendor\importlib_metadata-8.0.0.dist-info\top_level.txt
%TEMP%\_mei34042\setuptools\_vendor\importlib_metadata-8.0.0.dist-info\wheel
%TEMP%\_mei34042\setuptools\_vendor\jaraco\text\lorem ipsum.txt
%TEMP%\_mei34042\unicodedata.pyd
%TEMP%\_mei34042\vcruntime140.dll
%TEMP%\_mei34042\vcruntime140_1.dll
%TEMP%\_mei34042\win32\perfmon.pyd
%TEMP%\_mei34042\win32\servicemanager.pyd
%TEMP%\_mei34042\win32\win32api.pyd
%TEMP%\_mei34042\win32\win32evtlog.pyd
%TEMP%\_mei34042\win32\win32gui.pyd
%TEMP%\_mei34042\win32\win32security.pyd
%TEMP%\_mei34042\win32\win32service.pyd
%TEMP%\_mei34042\win32\_win32sysloader.pyd
%TEMP%\_mei34042\_asyncio.pyd
%TEMP%\_mei34042\_bz2.pyd
%TEMP%\_mei34042\_ctypes.pyd
%TEMP%\_mei34042\_decimal.pyd
%TEMP%\_mei34042\_hashlib.pyd
%TEMP%\_mei34042\_lzma.pyd
%TEMP%\_mei34042\_multiprocessing.pyd
%TEMP%\_mei34042\_overlapped.pyd
%TEMP%\_mei34042\_queue.pyd
%TEMP%\_mei34042\_socket.pyd
%TEMP%\_mei34042\_ssl.pyd
%TEMP%\_mei34042\_wmi.pyd

Network activity

Connects to

'47.##.78.193':9001
'mo#####.map.fastly.net':443
'au##.c3pool.org':80

TCP

HTTP GET requests

http://47.##.78.193:9001/amin/nssm.exe via 47.##.78.193

Other

'au##.c3pool.org':80

UDP

DNS ASK mo#####.map.fastly.net
DNS ASK co##############e-chains.prod.autograph.services.mozaws.net
DNS ASK au##.c3pool.org

Miscellaneous

Creates and executes the following

'%WINDIR%\xmr\nssm.exe' install xxx %WINDIR%\xmr\xmrig.exe --config=%WINDIR%\xmr\config.json
'%WINDIR%\xmr\nssm.exe' set xxx AppDirectory %WINDIR%\xmr
'%WINDIR%\xmr\nssm.exe' set xxx AppPriority BELOW_NORMAL_PRIORITY_CLASS
'%WINDIR%\xmr\nssm.exe' set xxx Description "Windows Update Helper"
'%WINDIR%\xmr\nssm.exe'
'%WINDIR%\xmr\xmrig.exe' --config=%WINDIR%\xmr\config.json

Restarts the analyzed sample

Executes the following

'<SYSTEM32>\cmd.exe' /c "tasklist /fi "imagename eq xmrig.exe""
'<SYSTEM32>\tasklist.exe' /fi "imagename eq xmrig.exe"
'<SYSTEM32>\cmd.exe' /c "attrib +s +h "%WINDIR%\xmr""
'<SYSTEM32>\attrib.exe' +s +h "%WINDIR%\xmr"
'<SYSTEM32>\cmd.exe' /c "%WINDIR%\xmr\nssm.exe install xxx %WINDIR%\xmr\xmrig.exe --config=%WINDIR%\xmr\config.json"
'<SYSTEM32>\cmd.exe' /c "%WINDIR%\xmr\nssm.exe set xxx AppDirectory %WINDIR%\xmr"
'<SYSTEM32>\cmd.exe' /c "%WINDIR%\xmr\nssm.exe set xxx AppPriority BELOW_NORMAL_PRIORITY_CLASS"
'<SYSTEM32>\cmd.exe' /c "%WINDIR%\xmr\nssm.exe set xxx Description "Windows Update Helper""
'<SYSTEM32>\cmd.exe' /c "attrib +s +h "%APPDATA%\Microsoft\Windows\Start Menu\Programs\Startup\xmr_startup.bat""
'<SYSTEM32>\attrib.exe' +s +h "%APPDATA%\Microsoft\Windows\Start Menu\Programs\Startup\xmr_startup.bat"
'<SYSTEM32>\cmd.exe' /c "%TEMP%\delete_self.bat"
'<SYSTEM32>\timeout.exe' /t 3 /nobreak
'<SYSTEM32>\cmd.exe' /c "tasklist /fi "imagename eq xmrig.exe""' (with hidden window)
'<SYSTEM32>\cmd.exe' /c "attrib +s +h "%WINDIR%\xmr""' (with hidden window)
'<SYSTEM32>\cmd.exe' /c "%WINDIR%\xmr\nssm.exe install xxx %WINDIR%\xmr\xmrig.exe --config=%WINDIR%\xmr\config.json"' (with hidden window)
'<SYSTEM32>\cmd.exe' /c "%WINDIR%\xmr\nssm.exe set xxx AppDirectory %WINDIR%\xmr"' (with hidden window)
'<SYSTEM32>\cmd.exe' /c "%WINDIR%\xmr\nssm.exe set xxx AppPriority BELOW_NORMAL_PRIORITY_CLASS"' (with hidden window)
'<SYSTEM32>\cmd.exe' /c "%WINDIR%\xmr\nssm.exe set xxx Description "Windows Update Helper""' (with hidden window)
'<SYSTEM32>\cmd.exe' /c "attrib +s +h "%APPDATA%\Microsoft\Windows\Start Menu\Programs\Startup\xmr_startup.bat""' (with hidden window)
'<SYSTEM32>\cmd.exe' /c "%TEMP%\delete_self.bat"' (with hidden window)

Curing recommendations

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.

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Use Dr.Web Anti-virus for macOS to run a full scan of your Mac.

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After booting up, run a full scan of all disk partitions with Dr.Web Anti-virus for Linux.

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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.

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