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Trojan.MulDrop38.65026

Added to the Dr.Web virus database: 2026-07-07

Virus description added:

Technical Information

To ensure autorun and distribution
Modifies the following registry keys
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Modifies file system
Creates the following files
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  • %TEMP%\_mei28722\numpy\random\mtrand.cp311-win_amd64.pyd
  • %TEMP%\_mei28722\psutil\_psutil_windows.pyd
  • %TEMP%\_mei28722\pyexpat.pyd
  • %TEMP%\_mei28722\python3.dll
  • %TEMP%\_mei28722\python311.dll
  • %TEMP%\_mei28722\pywin32_system32\pywintypes311.dll
  • %TEMP%\_mei28722\select.pyd
  • %TEMP%\_mei28722\ucrtbase.dll
  • %TEMP%\_mei28722\unicodedata.pyd
  • %TEMP%\_mei28722\win32\win32pdh.pyd
  • %TEMP%\winsys\160749.png
  • %TEMP%\winsys\160804.png
  • %TEMP%\winsys\160806.png
  • %TEMP%\winsys\160808.png
  • %TEMP%\winsys\160818.png
  • %TEMP%\winsys\160820.png
  • %TEMP%\winsys\160823.png
  • %TEMP%\winsys\160832.png
  • %TEMP%\winsys\160835.png
  • %TEMP%\winsys\160837.png
  • %TEMP%\winsys\160847.png
  • %TEMP%\winsys\160849.png
Sets the 'hidden' attribute to the following files
  • %APPDATA%\windowssecurity\systemupdate.exe
Deletes following files that it created itself
  • %TEMP%\_mei25362\81d243bd2c585b0f4821__mypyc.cp311-win_amd64.pyd
  • %TEMP%\_mei25362\api-ms-win-core-console-l1-1-0.dll
  • %TEMP%\_mei25362\api-ms-win-core-datetime-l1-1-0.dll
  • %TEMP%\_mei25362\api-ms-win-core-debug-l1-1-0.dll
  • %TEMP%\_mei25362\api-ms-win-core-errorhandling-l1-1-0.dll
  • %TEMP%\_mei25362\api-ms-win-core-fibers-l1-1-0.dll
  • %TEMP%\_mei25362\api-ms-win-core-fibers-l1-1-1.dll
  • %TEMP%\_mei25362\api-ms-win-core-file-l1-1-0.dll
  • %TEMP%\_mei25362\api-ms-win-core-file-l1-2-0.dll
  • %TEMP%\_mei25362\api-ms-win-core-file-l2-1-0.dll
  • %TEMP%\_mei25362\api-ms-win-core-handle-l1-1-0.dll
  • %TEMP%\_mei25362\api-ms-win-core-heap-l1-1-0.dll
  • %TEMP%\_mei25362\api-ms-win-core-interlocked-l1-1-0.dll
  • %TEMP%\_mei25362\api-ms-win-core-kernel32-legacy-l1-1-1.dll
  • %TEMP%\_mei25362\api-ms-win-core-libraryloader-l1-1-0.dll
  • %TEMP%\_mei25362\api-ms-win-core-localization-l1-2-0.dll
  • %TEMP%\_mei25362\api-ms-win-core-memory-l1-1-0.dll
  • %TEMP%\_mei25362\api-ms-win-core-namedpipe-l1-1-0.dll
  • %TEMP%\_mei25362\api-ms-win-core-processenvironment-l1-1-0.dll
  • %TEMP%\_mei25362\api-ms-win-core-processthreads-l1-1-0.dll
  • %TEMP%\_mei25362\api-ms-win-core-processthreads-l1-1-1.dll
  • %TEMP%\_mei25362\api-ms-win-core-profile-l1-1-0.dll
  • %TEMP%\_mei25362\api-ms-win-core-rtlsupport-l1-1-0.dll
  • %TEMP%\_mei25362\api-ms-win-core-string-l1-1-0.dll
  • %TEMP%\_mei25362\api-ms-win-core-synch-l1-1-0.dll
  • %TEMP%\_mei25362\api-ms-win-core-synch-l1-2-0.dll
  • %TEMP%\_mei25362\api-ms-win-core-sysinfo-l1-1-0.dll
  • %TEMP%\_mei25362\api-ms-win-core-sysinfo-l1-2-0.dll
  • %TEMP%\_mei25362\api-ms-win-core-timezone-l1-1-0.dll
  • %TEMP%\_mei25362\api-ms-win-core-util-l1-1-0.dll
  • %TEMP%\_mei25362\api-ms-win-crt-conio-l1-1-0.dll
  • %TEMP%\_mei25362\api-ms-win-crt-convert-l1-1-0.dll
  • %TEMP%\_mei25362\api-ms-win-crt-environment-l1-1-0.dll
  • %TEMP%\_mei25362\api-ms-win-crt-filesystem-l1-1-0.dll
  • %TEMP%\_mei25362\api-ms-win-crt-heap-l1-1-0.dll
  • %TEMP%\_mei25362\api-ms-win-crt-locale-l1-1-0.dll
  • %TEMP%\_mei25362\api-ms-win-crt-math-l1-1-0.dll
  • %TEMP%\_mei25362\api-ms-win-crt-private-l1-1-0.dll
  • %TEMP%\_mei25362\api-ms-win-crt-process-l1-1-0.dll
  • %TEMP%\_mei25362\api-ms-win-crt-runtime-l1-1-0.dll
  • %TEMP%\_mei25362\api-ms-win-crt-stdio-l1-1-0.dll
  • %TEMP%\_mei25362\api-ms-win-crt-string-l1-1-0.dll
  • %TEMP%\_mei25362\api-ms-win-crt-time-l1-1-0.dll
  • %TEMP%\_mei25362\api-ms-win-crt-utility-l1-1-0.dll
  • %TEMP%\_mei25362\base_library.zip
  • %TEMP%\_mei25362\certifi\cacert.pem
  • %TEMP%\_mei25362\charset_normalizer\cd.cp311-win_amd64.pyd
  • %TEMP%\_mei25362\charset_normalizer\md.cp311-win_amd64.pyd
  • %TEMP%\_mei25362\cryptography\hazmat\bindings\_rust.pyd
  • %TEMP%\_mei25362\cryptography-48.0.0.dist-info\installer
  • %TEMP%\_mei25362\cryptography-48.0.0.dist-info\licenses\license
  • %TEMP%\_mei25362\cryptography-48.0.0.dist-info\licenses\license.apache
  • %TEMP%\_mei25362\cryptography-48.0.0.dist-info\licenses\license.bsd
  • %TEMP%\_mei25362\cryptography-48.0.0.dist-info\metadata
  • %TEMP%\_mei25362\cryptography-48.0.0.dist-info\record
  • %TEMP%\_mei25362\cryptography-48.0.0.dist-info\sboms\cryptography-rust.cyclonedx.json
  • %TEMP%\_mei25362\cryptography-48.0.0.dist-info\sboms\sbom.json
  • %TEMP%\_mei25362\cryptography-48.0.0.dist-info\wheel
  • %TEMP%\_mei25362\libcrypto-1_1.dll
  • %TEMP%\_mei25362\libffi-8.dll
  • %TEMP%\_mei25362\libssl-1_1.dll
  • %TEMP%\_mei25362\numpy\fft\_pocketfft_umath.cp311-win_amd64.pyd
  • %TEMP%\_mei25362\numpy\linalg\_umath_linalg.cp311-win_amd64.pyd
  • %TEMP%\_mei25362\numpy\random\bit_generator.cp311-win_amd64.pyd
  • %TEMP%\_mei25362\numpy\random\mtrand.cp311-win_amd64.pyd
  • %TEMP%\_mei25362\numpy\random\_bounded_integers.cp311-win_amd64.pyd
  • %TEMP%\_mei25362\numpy\random\_common.cp311-win_amd64.pyd
  • %TEMP%\_mei25362\numpy\random\_generator.cp311-win_amd64.pyd
  • %TEMP%\_mei25362\numpy\random\_mt19937.cp311-win_amd64.pyd
  • %TEMP%\_mei25362\numpy\random\_pcg64.cp311-win_amd64.pyd
  • %TEMP%\_mei25362\numpy\random\_philox.cp311-win_amd64.pyd
  • %TEMP%\_mei25362\numpy\random\_sfc64.cp311-win_amd64.pyd
  • %TEMP%\_mei25362\numpy\_core\_multiarray_tests.cp311-win_amd64.pyd
  • %TEMP%\_mei25362\numpy\_core\_multiarray_umath.cp311-win_amd64.pyd
  • %TEMP%\_mei25362\numpy-2.4.6.dist-info\delvewheel
  • %TEMP%\_mei25362\numpy-2.4.6.dist-info\entry_points.txt
  • %TEMP%\_mei25362\numpy-2.4.6.dist-info\installer
  • %TEMP%\_mei25362\numpy-2.4.6.dist-info\licenses\license.txt
  • %TEMP%\_mei25362\numpy-2.4.6.dist-info\licenses\numpy\fft\pocketfft\license.md
  • %TEMP%\_mei25362\numpy-2.4.6.dist-info\licenses\numpy\linalg\lapack_lite\license.txt
  • %TEMP%\_mei25362\numpy-2.4.6.dist-info\licenses\numpy\ma\license
  • %TEMP%\_mei25362\numpy-2.4.6.dist-info\licenses\numpy\random\license.md
  • %TEMP%\_mei25362\numpy-2.4.6.dist-info\licenses\numpy\random\src\distributions\license.md
  • %TEMP%\_mei25362\numpy-2.4.6.dist-info\licenses\numpy\random\src\mt19937\license.md
  • %TEMP%\_mei25362\numpy-2.4.6.dist-info\licenses\numpy\random\src\pcg64\license.md
  • %TEMP%\_mei25362\numpy-2.4.6.dist-info\licenses\numpy\random\src\philox\license.md
  • %TEMP%\_mei25362\numpy-2.4.6.dist-info\licenses\numpy\random\src\sfc64\license.md
  • %TEMP%\_mei25362\numpy-2.4.6.dist-info\licenses\numpy\random\src\splitmix64\license.md
  • %TEMP%\_mei25362\numpy-2.4.6.dist-info\licenses\numpy\_core\include\numpy\libdivide\license.txt
  • %TEMP%\_mei25362\numpy-2.4.6.dist-info\licenses\numpy\_core\src\common\pythoncapi-compat\copying
  • %TEMP%\_mei25362\numpy-2.4.6.dist-info\licenses\numpy\_core\src\highway\license
  • %TEMP%\_mei25362\numpy-2.4.6.dist-info\licenses\numpy\_core\src\multiarray\dragon4_license.txt
  • %TEMP%\_mei25362\numpy-2.4.6.dist-info\licenses\numpy\_core\src\npysort\x86-simd-sort\license.md
  • %TEMP%\_mei25362\numpy-2.4.6.dist-info\licenses\numpy\_core\src\umath\svml\license
  • %TEMP%\_mei25362\numpy-2.4.6.dist-info\metadata
  • %TEMP%\_mei25362\numpy-2.4.6.dist-info\record
  • %TEMP%\_mei25362\numpy-2.4.6.dist-info\wheel
  • %TEMP%\_mei25362\numpy.libs\libscipy_openblas64_-63c857e738469261263c764a36be9436.dll
  • %TEMP%\_mei25362\numpy.libs\msvcp140-a4c2229bdc2a2a630acdc095b4d86008.dll
  • %TEMP%\_mei25362\pil\_avif.cp311-win_amd64.pyd
  • %TEMP%\_mei25362\pil\_imaging.cp311-win_amd64.pyd
  • %TEMP%\_mei25362\pil\_imagingcms.cp311-win_amd64.pyd
  • %TEMP%\_mei25362\pil\_imagingmath.cp311-win_amd64.pyd
  • %TEMP%\_mei25362\pil\_imagingtk.cp311-win_amd64.pyd
  • %TEMP%\_mei25362\pil\_webp.cp311-win_amd64.pyd
  • %TEMP%\_mei25362\psutil\_psutil_windows.pyd
  • %TEMP%\_mei25362\pyexpat.pyd
  • %TEMP%\_mei25362\python3.dll
  • %TEMP%\_mei25362\python311.dll
  • %TEMP%\_mei25362\pywin32_system32\pywintypes311.dll
  • %TEMP%\_mei25362\select.pyd
  • %TEMP%\_mei25362\ucrtbase.dll
  • %TEMP%\_mei25362\unicodedata.pyd
  • %TEMP%\_mei25362\vcruntime140.dll
  • %TEMP%\_mei25362\vcruntime140_1.dll
  • %TEMP%\_mei25362\win32\win32pdh.pyd
  • %TEMP%\_mei25362\_asyncio.pyd
  • %TEMP%\_mei25362\_bz2.pyd
  • %TEMP%\_mei25362\_cffi_backend.cp311-win_amd64.pyd
  • %TEMP%\_mei25362\_ctypes.pyd
  • %TEMP%\_mei25362\_decimal.pyd
  • %TEMP%\_mei25362\_elementtree.pyd
  • %TEMP%\_mei25362\_hashlib.pyd
  • %TEMP%\_mei25362\_lzma.pyd
  • %TEMP%\_mei25362\_multiprocessing.pyd
  • %TEMP%\_mei25362\_overlapped.pyd
  • %TEMP%\_mei25362\_queue.pyd
  • %TEMP%\_mei25362\_socket.pyd
  • %TEMP%\_mei25362\_ssl.pyd
  • %TEMP%\winsys\160749.png
  • %TEMP%\winsys\160804.png
  • %TEMP%\winsys\160806.png
  • %TEMP%\winsys\160808.png
  • %TEMP%\winsys\160818.png
  • %TEMP%\winsys\160820.png
  • %TEMP%\winsys\160823.png
  • %TEMP%\winsys\160832.png
  • %TEMP%\winsys\160835.png
  • %TEMP%\winsys\160837.png
  • %TEMP%\winsys\160847.png
  • %TEMP%\winsys\160849.png
Network activity
UDP
  • DNS ASK di##ord.com
Miscellaneous
Creates and executes the following
  • '%APPDATA%\windowssecurity\systemupdate.exe'
Restarts the analyzed sample
Executes the following
  • '<SYSTEM32>\cmd.exe' /c attrib +h "%APPDATA%\WindowsSecurity"
  • '<SYSTEM32>\attrib.exe' +h "%APPDATA%\WindowsSecurity"
  • '<SYSTEM32>\cmd.exe' /c attrib +h "%APPDATA%\WindowsSecurity\SystemUpdate.exe"
  • '<SYSTEM32>\attrib.exe' +h "%APPDATA%\WindowsSecurity\SystemUpdate.exe"
  • '<SYSTEM32>\cmd.exe' /c attrib +h "%TEMP%\winsys"
  • '<SYSTEM32>\attrib.exe' +h "%TEMP%\winsys"

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  1. 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.
  2. 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);
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