Analysis

  • max time kernel
    9s
  • max time network
    12s
  • platform
    windows11-21h2_x64
  • resource
    win11-20241007-en
  • resource tags

    arch:x64arch:x86image:win11-20241007-enlocale:en-usos:windows11-21h2-x64system
  • submitted
    20/01/2025, 14:03

General

  • Target
    YozoraOptimizer/Optimizer.exe
  • Size 69.5MB
  • Sample250120-rcvsfaspfr
  • SHA256 f2b2180d6772a464d11b2b995b32aa940ffe3a614ac0b75fc3dadf3f3630a938
  • MD5 SHA1 SHA512 SSDEEP
Score
7/10

Malware Config

Signatures

  • Drops startup file 2 IoCs
  • Loads dropped DLL 62 IoCs
  • Reads user/profile data of web browsers 3 TTPs

    Infostealers often target stored browser data, which can include saved credentials etc.

  • Legitimate hosting services abused for malware hosting/C2 1 TTPs 7 IoCs
  • Looks up external IP address via web service 4 IoCs

    Uses a legitimate IP lookup service to find the infected system's external IP.

  • Modifies registry class 1 IoCs
  • Suspicious behavior: EnumeratesProcesses 2 IoCs
  • Suspicious use of AdjustPrivilegeToken 64 IoCs
  • Suspicious use of WriteProcessMemory 16 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\YozoraOptimizer\Optimizer.exe
    "C:\Users\Admin\AppData\Local\Temp\YozoraOptimizer\Optimizer.exe"
    1⤵
    • Suspicious use of WriteProcessMemory
    PID:4884
    • C:\Users\Admin\AppData\Local\Temp\YozoraOptimizer\Optimizer.exe
      "C:\Users\Admin\AppData\Local\Temp\YozoraOptimizer\Optimizer.exe"
      2⤵
      • Drops startup file
      • Loads dropped DLL
      • Modifies registry class
      • Suspicious behavior: EnumeratesProcesses
      • Suspicious use of AdjustPrivilegeToken
      • Suspicious use of WriteProcessMemory
      PID:3956
      • C:\Windows\system32\cmd.exe
        C:\Windows\system32\cmd.exe /c "ver"
        3⤵
          PID:900
        • C:\Windows\system32\cmd.exe
          C:\Windows\system32\cmd.exe /c "C:\Windows\System32\wbem\WMIC.exe csproduct get uuid"
          3⤵
          • Suspicious use of WriteProcessMemory
          PID:2296
          • C:\Windows\System32\wbem\WMIC.exe
            C:\Windows\System32\wbem\WMIC.exe csproduct get uuid
            4⤵
            • Suspicious use of AdjustPrivilegeToken
            PID:2044
        • C:\Windows\system32\cmd.exe
          C:\Windows\system32\cmd.exe /c "C:\Windows\System32\wbem\WMIC.exe csproduct get uuid"
          3⤵
          • Suspicious use of WriteProcessMemory
          PID:968
          • C:\Windows\System32\wbem\WMIC.exe
            C:\Windows\System32\wbem\WMIC.exe csproduct get uuid
            4⤵
            • Suspicious use of AdjustPrivilegeToken
            PID:72
        • C:\Windows\system32\cmd.exe
          C:\Windows\system32\cmd.exe /c cls
          3⤵
            PID:3124
          • C:\Windows\system32\cmd.exe
            C:\Windows\system32\cmd.exe /c cls
            3⤵
              PID:3308

        Network

              MITRE ATT&CK Enterprise v15

              Replay Monitor

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              Downloads

              VCRUNTIME140.dll

              • Path C:\Users\Admin\AppData\Local\Temp\_MEI48842\VCRUNTIME140.dll
              • Size 96KB
              • SHA256 d66c3b47091ceb3f8d3cc165a43d285ae919211a0c0fcb74491ee574d8d464f8
              • MD5 SHA1 SHA512 SSDEEP

              VCRUNTIME140_1.dll

              • Path C:\Users\Admin\AppData\Local\Temp\_MEI48842\VCRUNTIME140_1.dll
              • Size 37KB
              • SHA256 1758085a61527b427c4380f0c976d29a8bee889f2ac480c356a3f166433bf70e
              • MD5 SHA1 SHA512 SSDEEP

              _asyncio.pyd

              • Path C:\Users\Admin\AppData\Local\Temp\_MEI48842\_asyncio.pyd
              • Size 62KB
              • SHA256 aebc378db08617ea81a0a3a3bc044bcc7e6303e314630392dd51bab12f879bd9
              • MD5 SHA1 SHA512 SSDEEP

              _bz2.pyd

              • Path C:\Users\Admin\AppData\Local\Temp\_MEI48842\_bz2.pyd
              • Size 81KB
              • SHA256 5843872d5e2b08f138a71fe9ba94813afee59c8b48166d4a8eb0f606107a7e80
              • MD5 SHA1 SHA512 SSDEEP

              _cffi_backend.cp311-win_amd64.pyd

              • Path C:\Users\Admin\AppData\Local\Temp\_MEI48842\_cffi_backend.cp311-win_amd64.pyd
              • Size 174KB
              • SHA256 9aee90cf7980c8ff694bb3ffe06c71f87eb6a613033f73e3174a732648d39980
              • MD5 SHA1 SHA512 SSDEEP

              _ctypes.pyd

              • Path C:\Users\Admin\AppData\Local\Temp\_MEI48842\_ctypes.pyd
              • Size 120KB
              • SHA256 e662d2b35bb48c5f3432bde79c0d20313238af800968ba0faa6ea7e7e5ef4535
              • MD5 SHA1 SHA512 SSDEEP

              _decimal.pyd

              • Path C:\Users\Admin\AppData\Local\Temp\_MEI48842\_decimal.pyd
              • Size 245KB
              • SHA256 d0df57988a74acd50b2d261e8b5f2c25da7b940ec2aafbee444c277552421e6e
              • MD5 SHA1 SHA512 SSDEEP

              _elementtree.pyd

              • Path C:\Users\Admin\AppData\Local\Temp\_MEI48842\_elementtree.pyd
              • Size 123KB
              • SHA256 df71d64818cfecd61ad0122bea23b685d01bd241f1b06879a2999917818b0787
              • MD5 SHA1 SHA512 SSDEEP

              _hashlib.pyd

              • Path C:\Users\Admin\AppData\Local\Temp\_MEI48842\_hashlib.pyd
              • Size 62KB
              • SHA256 39bc615842a176db72d4e0558f3cdcae23ab0623ad132f815d21dcfbfd4b110e
              • MD5 SHA1 SHA512 SSDEEP

              _lzma.pyd

              • Path C:\Users\Admin\AppData\Local\Temp\_MEI48842\_lzma.pyd
              • Size 154KB
              • SHA256 613de58e4a9a80eff8f8bc45c350a6eaebf89f85ffd2d7e3b0b266bf0888a60a
              • MD5 SHA1 SHA512 SSDEEP

              _multiprocessing.pyd

              • Path C:\Users\Admin\AppData\Local\Temp\_MEI48842\_multiprocessing.pyd
              • Size 32KB
              • SHA256 0ae3bf383ff998886f97576c55d6bf0a076c24395cf6fcd2265316e9a6e8c007
              • MD5 SHA1 SHA512 SSDEEP

              _overlapped.pyd

              • Path C:\Users\Admin\AppData\Local\Temp\_MEI48842\_overlapped.pyd
              • Size 48KB
              • SHA256 a083e83f609ed7a2fc18a95d44d8f91c9dc74842f33e19e91988e84db94c3b5b
              • MD5 SHA1 SHA512 SSDEEP

              _queue.pyd

              • Path C:\Users\Admin\AppData\Local\Temp\_MEI48842\_queue.pyd
              • Size 30KB
              • SHA256 2f71046891ba279b00b70eb031fe90b379dbe84559cf49ce5d1297ea6bf47a78
              • MD5 SHA1 SHA512 SSDEEP

              _socket.pyd

              • Path C:\Users\Admin\AppData\Local\Temp\_MEI48842\_socket.pyd
              • Size 76KB
              • SHA256 39715ef8d043354f0ab15f62878530a38518fb6192bc48da6a098498e8d35769
              • MD5 SHA1 SHA512 SSDEEP

              _ssl.pyd

              • Path C:\Users\Admin\AppData\Local\Temp\_MEI48842\_ssl.pyd
              • Size 155KB
              • SHA256 cb42e8598e3fa53eeebf63f2af1730b9ec64614bda276ab2cd1f1c196b3d7e32
              • MD5 SHA1 SHA512 SSDEEP

              _uuid.pyd

              • Path C:\Users\Admin\AppData\Local\Temp\_MEI48842\_uuid.pyd
              • Size 23KB
              • SHA256 f7f57807c15c21c5aa9818edf3993d0b94aef8af5808e1ad86a98637fc499d44
              • MD5 SHA1 SHA512 SSDEEP

              base_library.zip

              • Path C:\Users\Admin\AppData\Local\Temp\_MEI48842\base_library.zip
              • Size 1.4MB
              • SHA256 130e506ead01b91b60d6d56072c468aeb5457dd0f2ecd6ce17dfcbb7d51a1f8c
              • MD5 SHA1 SHA512 SSDEEP

              cacert.pem

              • Path C:\Users\Admin\AppData\Local\Temp\_MEI48842\certifi\cacert.pem
              • Size 287KB
              • SHA256 807897254f383a27f45e44f49656f378abab2141ede43a4ad3c2420a597dd23f
              • MD5 SHA1 SHA512 SSDEEP

              md.cp311-win_amd64.pyd

              • Path C:\Users\Admin\AppData\Local\Temp\_MEI48842\charset_normalizer\md.cp311-win_amd64.pyd
              • Size 10KB
              • SHA256 e21f4c40c29be0b115463e7bb8a365946a4afc152b9fff602abd41c6e0ce68a2
              • MD5 SHA1 SHA512 SSDEEP

              md__mypyc.cp311-win_amd64.pyd

              • Path C:\Users\Admin\AppData\Local\Temp\_MEI48842\charset_normalizer\md__mypyc.cp311-win_amd64.pyd
              • Size 118KB
              • SHA256 f3501ebce24205f3dc54192cd917eab9a899fe936570650253d4c1466383eff1
              • MD5 SHA1 SHA512 SSDEEP

              libcrypto-1_1.dll

              • Path C:\Users\Admin\AppData\Local\Temp\_MEI48842\libcrypto-1_1.dll
              • Size 3.3MB
              • SHA256 976ce72efd0a8aeeb6e21ad441aa9138434314ea07f777432205947cdb149541
              • MD5 SHA1 SHA512 SSDEEP

              libffi-8.dll

              • Path C:\Users\Admin\AppData\Local\Temp\_MEI48842\libffi-8.dll
              • Size 34KB
              • SHA256 128a583e821e52b595eb4b3dda17697d3ca456ee72945f7ecce48ededad0e93c
              • MD5 SHA1 SHA512 SSDEEP

              libssl-1_1.dll

              • Path C:\Users\Admin\AppData\Local\Temp\_MEI48842\libssl-1_1.dll
              • Size 686KB
              • SHA256 2aebb73530d21a2273692a5a3d57235b770daf1c35f60c74e01754a5dac05071
              • MD5 SHA1 SHA512 SSDEEP

              _multidict.cp311-win_amd64.pyd

              • Path C:\Users\Admin\AppData\Local\Temp\_MEI48842\multidict\_multidict.cp311-win_amd64.pyd
              • Size 46KB
              • SHA256 bcbb43ce216e38361cb108e99bab86ae2c0f8930c86d12cadfca703e26003cb1
              • MD5 SHA1 SHA512 SSDEEP

              _psutil_windows.pyd

              • Path C:\Users\Admin\AppData\Local\Temp\_MEI48842\psutil\_psutil_windows.pyd
              • Size 65KB
              • SHA256 dd0ccdeeca681645025ca0f562ea45b5b17a1ebfcf1688cd0647a950a2992e2f
              • MD5 SHA1 SHA512 SSDEEP

              pyexpat.pyd

              • Path C:\Users\Admin\AppData\Local\Temp\_MEI48842\pyexpat.pyd
              • Size 193KB
              • SHA256 d97f3e27130c267e7d3287d1b159f65559e84ead9090d02a01b4c7dc663cd509
              • MD5 SHA1 SHA512 SSDEEP

              python3.DLL

              • Path C:\Users\Admin\AppData\Local\Temp\_MEI48842\python3.DLL
              • Size 64KB
              • SHA256 4055d1b9e553b78c244143ab6b48151604003b39a9bf54879dee9175455c1281
              • MD5 SHA1 SHA512 SSDEEP

              python311.dll

              • Path C:\Users\Admin\AppData\Local\Temp\_MEI48842\python311.dll
              • Size 5.5MB
              • SHA256 a0cf640e756875c25c12b4a38ba5f2772e8e512036e2ac59eb8567bf05ffbfb7
              • MD5 SHA1 SHA512 SSDEEP

              pythoncom311.dll

              • Path C:\Users\Admin\AppData\Local\Temp\_MEI48842\pywin32_system32\pythoncom311.dll
              • Size 654KB
              • SHA256 1daf7c87b48554f1481ba4431102d0429704832e42e3563501b1ffdd3362fcd1
              • MD5 SHA1 SHA512 SSDEEP

              pywintypes311.dll

              • Path C:\Users\Admin\AppData\Local\Temp\_MEI48842\pywin32_system32\pywintypes311.dll
              • Size 131KB
              • SHA256 615eb8a75f9ed9371a59da8f31e27ee091c013db0b9164a5124ca0656ea47cb4
              • MD5 SHA1 SHA512 SSDEEP

              select.pyd

              • Path C:\Users\Admin\AppData\Local\Temp\_MEI48842\select.pyd
              • Size 28KB
              • SHA256 0046eb32f873cde62cf29af02687b1dd43154e9fd10e0aa3d8353d3debb38790
              • MD5 SHA1 SHA512 SSDEEP

              unicodedata.pyd

              • Path C:\Users\Admin\AppData\Local\Temp\_MEI48842\unicodedata.pyd
              • Size 1.1MB
              • SHA256 ecf7836aa0d36b5880eb6f799ec402b1f2e999f78bfff6fb9a942d1d8d0b9baa
              • MD5 SHA1 SHA512 SSDEEP

              win32api.pyd

              • Path C:\Users\Admin\AppData\Local\Temp\_MEI48842\win32\win32api.pyd
              • Size 130KB
              • SHA256 b938c8cd68b15ec62f053045a764d8dd38162a75373b305b4cf1392ac05df5f9
              • MD5 SHA1 SHA512 SSDEEP

              _quoting_c.cp311-win_amd64.pyd

              • Path C:\Users\Admin\AppData\Local\Temp\_MEI48842\yarl\_quoting_c.cp311-win_amd64.pyd
              • Size 95KB
              • SHA256 36975a42953e5b6dea22f1398c20cc44c4881e3e16eef0ca757c27e969ecc6b0
              • MD5 SHA1 SHA512 SSDEEP