Analysis

  • max time kernel
    48s
  • max time network
    51s
  • 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/data/start.bat
  • Size 49B
  • Sample250120-rcvsfaspfr
  • SHA256 a5ce377486710d604357efc559b3516523d4378670127c51b21944235dadccdb
  • MD5 SHA1 SHA512
Score
7/10

Malware Config

Signatures

  • Drops startup file 3 IoCs
  • Loads dropped DLL 64 IoCs
  • Legitimate hosting services abused for malware hosting/C2 1 TTPs 13 IoCs
  • Looks up external IP address via web service 6 IoCs

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

  • Modifies registry class 2 IoCs
  • Suspicious behavior: EnumeratesProcesses 4 IoCs
  • Suspicious use of AdjustPrivilegeToken 64 IoCs
  • Suspicious use of WriteProcessMemory 32 IoCs

Processes

  • C:\Windows\system32\cmd.exe
    C:\Windows\system32\cmd.exe /c "C:\Users\Admin\AppData\Local\Temp\YozoraOptimizer\data\start.bat"
    1⤵
      PID:4852
    • C:\Windows\System32\rundll32.exe
      C:\Windows\System32\rundll32.exe C:\Windows\System32\shell32.dll,SHCreateLocalServerRunDll {9aa46009-3ce0-458a-a354-715610a075e6} -Embedding
      1⤵
        PID:4696
      • C:\Users\Admin\AppData\Local\Temp\YozoraOptimizer\Optimizer.exe
        "C:\Users\Admin\AppData\Local\Temp\YozoraOptimizer\Optimizer.exe"
        1⤵
        • Suspicious use of WriteProcessMemory
        PID:2596
        • 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:3016
          • C:\Windows\system32\cmd.exe
            C:\Windows\system32\cmd.exe /c "ver"
            3⤵
              PID:3912
            • 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:2552
              • C:\Windows\System32\wbem\WMIC.exe
                C:\Windows\System32\wbem\WMIC.exe csproduct get uuid
                4⤵
                • Suspicious use of AdjustPrivilegeToken
                PID:3012
            • 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:4372
              • C:\Windows\System32\wbem\WMIC.exe
                C:\Windows\System32\wbem\WMIC.exe csproduct get uuid
                4⤵
                • Suspicious use of AdjustPrivilegeToken
                PID:2176
            • C:\Windows\system32\cmd.exe
              C:\Windows\system32\cmd.exe /c cls
              3⤵
                PID:3300
              • C:\Windows\system32\cmd.exe
                C:\Windows\system32\cmd.exe /c cls
                3⤵
                  PID:2044
            • C:\Users\Admin\AppData\Local\Temp\YozoraOptimizer\Optimizer.exe
              "C:\Users\Admin\AppData\Local\Temp\YozoraOptimizer\Optimizer.exe"
              1⤵
              • Suspicious use of WriteProcessMemory
              PID:3320
              • 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 WriteProcessMemory
                PID:4496
                • C:\Windows\system32\cmd.exe
                  C:\Windows\system32\cmd.exe /c "ver"
                  3⤵
                    PID:4724
                  • 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:3548
                    • C:\Windows\System32\wbem\WMIC.exe
                      C:\Windows\System32\wbem\WMIC.exe csproduct get uuid
                      4⤵
                        PID:1384
                    • 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:3288
                      • C:\Windows\System32\wbem\WMIC.exe
                        C:\Windows\System32\wbem\WMIC.exe csproduct get uuid
                        4⤵
                          PID:4500
                      • C:\Windows\system32\cmd.exe
                        C:\Windows\system32\cmd.exe /c cls
                        3⤵
                          PID:4548
                        • C:\Windows\system32\cmd.exe
                          C:\Windows\system32\cmd.exe /c cls
                          3⤵
                            PID:2072

                      Network

                            MITRE ATT&CK Enterprise v15

                            Replay Monitor

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                            Downloads

                            VCRUNTIME140.dll

                            • Path C:\Users\Admin\AppData\Local\Temp\_MEI25962\VCRUNTIME140.dll
                            • Size 96KB
                            • SHA256 d66c3b47091ceb3f8d3cc165a43d285ae919211a0c0fcb74491ee574d8d464f8
                            • MD5 SHA1 SHA512 SSDEEP

                            VCRUNTIME140_1.dll

                            • Path C:\Users\Admin\AppData\Local\Temp\_MEI25962\VCRUNTIME140_1.dll
                            • Size 37KB
                            • SHA256 1758085a61527b427c4380f0c976d29a8bee889f2ac480c356a3f166433bf70e
                            • MD5 SHA1 SHA512 SSDEEP

                            _asyncio.pyd

                            • Path C:\Users\Admin\AppData\Local\Temp\_MEI25962\_asyncio.pyd
                            • Size 62KB
                            • SHA256 aebc378db08617ea81a0a3a3bc044bcc7e6303e314630392dd51bab12f879bd9
                            • MD5 SHA1 SHA512 SSDEEP

                            _bz2.pyd

                            • Path C:\Users\Admin\AppData\Local\Temp\_MEI25962\_bz2.pyd
                            • Size 81KB
                            • SHA256 5843872d5e2b08f138a71fe9ba94813afee59c8b48166d4a8eb0f606107a7e80
                            • MD5 SHA1 SHA512 SSDEEP

                            _cffi_backend.cp311-win_amd64.pyd

                            • Path C:\Users\Admin\AppData\Local\Temp\_MEI25962\_cffi_backend.cp311-win_amd64.pyd
                            • Size 174KB
                            • SHA256 9aee90cf7980c8ff694bb3ffe06c71f87eb6a613033f73e3174a732648d39980
                            • MD5 SHA1 SHA512 SSDEEP

                            _ctypes.pyd

                            • Path C:\Users\Admin\AppData\Local\Temp\_MEI25962\_ctypes.pyd
                            • Size 120KB
                            • SHA256 e662d2b35bb48c5f3432bde79c0d20313238af800968ba0faa6ea7e7e5ef4535
                            • MD5 SHA1 SHA512 SSDEEP

                            _decimal.pyd

                            • Path C:\Users\Admin\AppData\Local\Temp\_MEI25962\_decimal.pyd
                            • Size 245KB
                            • SHA256 d0df57988a74acd50b2d261e8b5f2c25da7b940ec2aafbee444c277552421e6e
                            • MD5 SHA1 SHA512 SSDEEP

                            _elementtree.pyd

                            • Path C:\Users\Admin\AppData\Local\Temp\_MEI25962\_elementtree.pyd
                            • Size 123KB
                            • SHA256 df71d64818cfecd61ad0122bea23b685d01bd241f1b06879a2999917818b0787
                            • MD5 SHA1 SHA512 SSDEEP

                            _hashlib.pyd

                            • Path C:\Users\Admin\AppData\Local\Temp\_MEI25962\_hashlib.pyd
                            • Size 62KB
                            • SHA256 39bc615842a176db72d4e0558f3cdcae23ab0623ad132f815d21dcfbfd4b110e
                            • MD5 SHA1 SHA512 SSDEEP

                            _lzma.pyd

                            • Path C:\Users\Admin\AppData\Local\Temp\_MEI25962\_lzma.pyd
                            • Size 154KB
                            • SHA256 613de58e4a9a80eff8f8bc45c350a6eaebf89f85ffd2d7e3b0b266bf0888a60a
                            • MD5 SHA1 SHA512 SSDEEP

                            _multiprocessing.pyd

                            • Path C:\Users\Admin\AppData\Local\Temp\_MEI25962\_multiprocessing.pyd
                            • Size 32KB
                            • SHA256 0ae3bf383ff998886f97576c55d6bf0a076c24395cf6fcd2265316e9a6e8c007
                            • MD5 SHA1 SHA512 SSDEEP

                            _overlapped.pyd

                            • Path C:\Users\Admin\AppData\Local\Temp\_MEI25962\_overlapped.pyd
                            • Size 48KB
                            • SHA256 a083e83f609ed7a2fc18a95d44d8f91c9dc74842f33e19e91988e84db94c3b5b
                            • MD5 SHA1 SHA512 SSDEEP

                            _queue.pyd

                            • Path C:\Users\Admin\AppData\Local\Temp\_MEI25962\_queue.pyd
                            • Size 30KB
                            • SHA256 2f71046891ba279b00b70eb031fe90b379dbe84559cf49ce5d1297ea6bf47a78
                            • MD5 SHA1 SHA512 SSDEEP

                            _socket.pyd

                            • Path C:\Users\Admin\AppData\Local\Temp\_MEI25962\_socket.pyd
                            • Size 76KB
                            • SHA256 39715ef8d043354f0ab15f62878530a38518fb6192bc48da6a098498e8d35769
                            • MD5 SHA1 SHA512 SSDEEP

                            _ssl.pyd

                            • Path C:\Users\Admin\AppData\Local\Temp\_MEI25962\_ssl.pyd
                            • Size 155KB
                            • SHA256 cb42e8598e3fa53eeebf63f2af1730b9ec64614bda276ab2cd1f1c196b3d7e32
                            • MD5 SHA1 SHA512 SSDEEP

                            _uuid.pyd

                            • Path C:\Users\Admin\AppData\Local\Temp\_MEI25962\_uuid.pyd
                            • Size 23KB
                            • SHA256 f7f57807c15c21c5aa9818edf3993d0b94aef8af5808e1ad86a98637fc499d44
                            • MD5 SHA1 SHA512 SSDEEP

                            base_library.zip

                            • Path C:\Users\Admin\AppData\Local\Temp\_MEI25962\base_library.zip
                            • Size 1.4MB
                            • SHA256 130e506ead01b91b60d6d56072c468aeb5457dd0f2ecd6ce17dfcbb7d51a1f8c
                            • MD5 SHA1 SHA512 SSDEEP

                            cacert.pem

                            • Path C:\Users\Admin\AppData\Local\Temp\_MEI25962\certifi\cacert.pem
                            • Size 287KB
                            • SHA256 807897254f383a27f45e44f49656f378abab2141ede43a4ad3c2420a597dd23f
                            • MD5 SHA1 SHA512 SSDEEP

                            md.cp311-win_amd64.pyd

                            • Path C:\Users\Admin\AppData\Local\Temp\_MEI25962\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\_MEI25962\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\_MEI25962\libcrypto-1_1.dll
                            • Size 3.3MB
                            • SHA256 976ce72efd0a8aeeb6e21ad441aa9138434314ea07f777432205947cdb149541
                            • MD5 SHA1 SHA512 SSDEEP

                            libffi-8.dll

                            • Path C:\Users\Admin\AppData\Local\Temp\_MEI25962\libffi-8.dll
                            • Size 34KB
                            • SHA256 128a583e821e52b595eb4b3dda17697d3ca456ee72945f7ecce48ededad0e93c
                            • MD5 SHA1 SHA512 SSDEEP

                            libssl-1_1.dll

                            • Path C:\Users\Admin\AppData\Local\Temp\_MEI25962\libssl-1_1.dll
                            • Size 686KB
                            • SHA256 2aebb73530d21a2273692a5a3d57235b770daf1c35f60c74e01754a5dac05071
                            • MD5 SHA1 SHA512 SSDEEP

                            _multidict.cp311-win_amd64.pyd

                            • Path C:\Users\Admin\AppData\Local\Temp\_MEI25962\multidict\_multidict.cp311-win_amd64.pyd
                            • Size 46KB
                            • SHA256 bcbb43ce216e38361cb108e99bab86ae2c0f8930c86d12cadfca703e26003cb1
                            • MD5 SHA1 SHA512 SSDEEP

                            _helpers_c.cp311-win_amd64.pyd

                            • Path C:\Users\Admin\AppData\Local\Temp\_MEI25962\propcache\_helpers_c.cp311-win_amd64.pyd
                            • Size 72KB
                            • SHA256 3d297d27ce61a6891db6308eb07dce20a4e80f88b49a0f4c12ec4ca21cb71136
                            • MD5 SHA1 SHA512 SSDEEP

                            _psutil_windows.pyd

                            • Path C:\Users\Admin\AppData\Local\Temp\_MEI25962\psutil\_psutil_windows.pyd
                            • Size 65KB
                            • SHA256 dd0ccdeeca681645025ca0f562ea45b5b17a1ebfcf1688cd0647a950a2992e2f
                            • MD5 SHA1 SHA512 SSDEEP

                            pyexpat.pyd

                            • Path C:\Users\Admin\AppData\Local\Temp\_MEI25962\pyexpat.pyd
                            • Size 193KB
                            • SHA256 d97f3e27130c267e7d3287d1b159f65559e84ead9090d02a01b4c7dc663cd509
                            • MD5 SHA1 SHA512 SSDEEP

                            python3.DLL

                            • Path C:\Users\Admin\AppData\Local\Temp\_MEI25962\python3.DLL
                            • Size 64KB
                            • SHA256 4055d1b9e553b78c244143ab6b48151604003b39a9bf54879dee9175455c1281
                            • MD5 SHA1 SHA512 SSDEEP

                            python311.dll

                            • Path C:\Users\Admin\AppData\Local\Temp\_MEI25962\python311.dll
                            • Size 5.5MB
                            • SHA256 a0cf640e756875c25c12b4a38ba5f2772e8e512036e2ac59eb8567bf05ffbfb7
                            • MD5 SHA1 SHA512 SSDEEP

                            pythoncom311.dll

                            • Path C:\Users\Admin\AppData\Local\Temp\_MEI25962\pywin32_system32\pythoncom311.dll
                            • Size 654KB
                            • SHA256 1daf7c87b48554f1481ba4431102d0429704832e42e3563501b1ffdd3362fcd1
                            • MD5 SHA1 SHA512 SSDEEP

                            pywintypes311.dll

                            • Path C:\Users\Admin\AppData\Local\Temp\_MEI25962\pywin32_system32\pywintypes311.dll
                            • Size 131KB
                            • SHA256 615eb8a75f9ed9371a59da8f31e27ee091c013db0b9164a5124ca0656ea47cb4
                            • MD5 SHA1 SHA512 SSDEEP

                            select.pyd

                            • Path C:\Users\Admin\AppData\Local\Temp\_MEI25962\select.pyd
                            • Size 28KB
                            • SHA256 0046eb32f873cde62cf29af02687b1dd43154e9fd10e0aa3d8353d3debb38790
                            • MD5 SHA1 SHA512 SSDEEP

                            unicodedata.pyd

                            • Path C:\Users\Admin\AppData\Local\Temp\_MEI25962\unicodedata.pyd
                            • Size 1.1MB
                            • SHA256 ecf7836aa0d36b5880eb6f799ec402b1f2e999f78bfff6fb9a942d1d8d0b9baa
                            • MD5 SHA1 SHA512 SSDEEP

                            win32api.pyd

                            • Path C:\Users\Admin\AppData\Local\Temp\_MEI25962\win32\win32api.pyd
                            • Size 130KB
                            • SHA256 b938c8cd68b15ec62f053045a764d8dd38162a75373b305b4cf1392ac05df5f9
                            • MD5 SHA1 SHA512 SSDEEP

                            _quoting_c.cp311-win_amd64.pyd

                            • Path C:\Users\Admin\AppData\Local\Temp\_MEI25962\yarl\_quoting_c.cp311-win_amd64.pyd
                            • Size 95KB
                            • SHA256 36975a42953e5b6dea22f1398c20cc44c4881e3e16eef0ca757c27e969ecc6b0
                            • MD5 SHA1 SHA512 SSDEEP

                            INSTALLER

                            • Path C:\Users\Admin\AppData\Local\Temp\_MEI33202\cryptography-44.0.0.dist-info\INSTALLER
                            • Size 4B
                            • SHA256 ceebae7b8927a3227e5303cf5e0f1f7b34bb542ad7250ac03fbcde36ec2f1508
                            • MD5 SHA1 SHA512