Analysis

  • max time kernel
    156s
  • max time network
    161s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20240226-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20240226-enlocale:en-usos:windows10-2004-x64system
  • submitted
    04/04/2024, 22:56

General

  • Target
    c400da7d3b78ed5be349c884bc326780_JaffaCakes118.exe
  • Size 406KB
  • Sample240404-2w5f4add64
  • SHA256 64335d170991053aa432dd2326936e3e7a81480fd3c1c4f8978a2a7abf32ac54
  • MD5 SHA1 SHA512 SSDEEP

Malware Config

Signatures

  • Expiro, m0yv

    Expiro aka m0yv is a multi-functional backdoor written in C++.

  • Expiro payload 5 IoCs
  • Disables taskbar notifications via registry modification
  • Executes dropped EXE 8 IoCs
  • Windows security modification 2 TTPs 2 IoCs
  • Checks installed software on the system 1 TTPs

    Looks up Uninstall key entries in the registry to enumerate software on the system.

  • Enumerates connected drives 3 TTPs 42 IoCs

    Attempts to read the root path of hard drives other than the default C: drive.

  • Drops file in System32 directory 64 IoCs
  • Drops file in Program Files directory 58 IoCs
  • Drops file in Windows directory 4 IoCs
  • Modifies data under HKEY_USERS 5 IoCs
  • Modifies registry class 1 IoCs
  • Suspicious behavior: EnumeratesProcesses 32 IoCs
  • Suspicious behavior: LoadsDriver 2 IoCs
  • Suspicious use of AdjustPrivilegeToken 4 IoCs
  • Suspicious use of SetWindowsHookEx 1 IoCs
  • System policy modification 1 TTPs 2 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\c400da7d3b78ed5be349c884bc326780_JaffaCakes118.exe
    "C:\Users\Admin\AppData\Local\Temp\c400da7d3b78ed5be349c884bc326780_JaffaCakes118.exe"
    1⤵
    • Enumerates connected drives
    • Drops file in System32 directory
    • Drops file in Program Files directory
    • Drops file in Windows directory
    • Suspicious use of AdjustPrivilegeToken
    PID:2604
  • C:\Windows\system32\OpenWith.exe
    C:\Windows\system32\OpenWith.exe -Embedding
    1⤵
    • Modifies registry class
    • Suspicious use of SetWindowsHookEx
    PID:3624
  • C:\Windows\System32\alg.exe
    C:\Windows\System32\alg.exe
    1⤵
    • Executes dropped EXE
    • Windows security modification
    • Enumerates connected drives
    • Drops file in System32 directory
    • Drops file in Program Files directory
    • Drops file in Windows directory
    • Suspicious behavior: EnumeratesProcesses
    • Suspicious use of AdjustPrivilegeToken
    • System policy modification
    PID:2092
  • C:\Windows\system32\DiagSvcs\DiagnosticsHub.StandardCollector.Service.exe
    C:\Windows\system32\DiagSvcs\DiagnosticsHub.StandardCollector.Service.exe
    1⤵
    • Executes dropped EXE
    PID:2776
  • C:\Windows\System32\svchost.exe
    C:\Windows\System32\svchost.exe -k NetworkService -p -s TapiSrv
    1⤵
      PID:4552
    • C:\Windows\system32\fxssvc.exe
      C:\Windows\system32\fxssvc.exe
      1⤵
      • Executes dropped EXE
      • Modifies data under HKEY_USERS
      • Suspicious use of AdjustPrivilegeToken
      PID:2044
    • C:\Program Files\Google\Chrome\Application\106.0.5249.119\elevation_service.exe
      "C:\Program Files\Google\Chrome\Application\106.0.5249.119\elevation_service.exe"
      1⤵
      • Executes dropped EXE
      PID:1464
    • C:\Program Files (x86)\Microsoft\Edge\Application\122.0.2365.52\elevation_service.exe
      "C:\Program Files (x86)\Microsoft\Edge\Application\122.0.2365.52\elevation_service.exe"
      1⤵
      • Executes dropped EXE
      PID:4952
    • C:\Program Files (x86)\Microsoft\Edge\Application\msedge.exe
      "C:\Program Files (x86)\Microsoft\Edge\Application\msedge.exe" --type=utility --utility-sub-type=asset_store.mojom.AssetStoreService --lang=en-US --service-sandbox-type=asset_store_service --no-appcompat-clear --mojo-platform-channel-handle=764 --field-trial-handle=2676,i,447940133669489189,1353734109898858672,262144 --variations-seed-version /prefetch:8
      1⤵
        PID:4356
      • C:\Program Files (x86)\Mozilla Maintenance Service\maintenanceservice.exe
        "C:\Program Files (x86)\Mozilla Maintenance Service\maintenanceservice.exe"
        1⤵
        • Executes dropped EXE
        • Drops file in Program Files directory
        PID:1948
      • C:\Windows\System32\msdtc.exe
        C:\Windows\System32\msdtc.exe
        1⤵
        • Executes dropped EXE
        • Drops file in System32 directory
        • Drops file in Windows directory
        PID:2044
      • C:\Windows\system32\msiexec.exe
        C:\Windows\system32\msiexec.exe /V
        1⤵
        • Executes dropped EXE
        • Suspicious use of AdjustPrivilegeToken
        PID:3100

      Network

            MITRE ATT&CK Enterprise v15

            Replay Monitor

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            Downloads

            bkkfejqa.tmp

            • Path C:\Program Files (x86)\Microsoft\Edge\Application\122.0.2365.52\bkkfejqa.tmp
            • Size 2.0MB
            • SHA256 ce8fc5b080159b17df77b10719c1631544a5513d7d752f0e8cb989247cbbc620
            • MD5 SHA1 SHA512 SSDEEP

            7z.exe

            • Path C:\Program Files\7-Zip\7z.exe
            • Size 940KB
            • SHA256 c6e8c62611217d679fdf399b48f1620e224c4f378cca8a194cf0c310a90fd07c
            • MD5 SHA1 SHA512 SSDEEP

            7zFM.exe

            • Path C:\Program Files\7-Zip\7zFM.exe
            • Size 1.3MB
            • SHA256 f626f1068bed003321ce2798845839860542fbc2ed0a0a79f6ddb0486be3415d
            • MD5 SHA1 SHA512 SSDEEP

            7zG.exe

            • Path C:\Program Files\7-Zip\7zG.exe
            • Size 1.1MB
            • SHA256 e683154f2c6b1658d71089daa06667361eeb92aa804e117a78452ece1899e8ab
            • MD5 SHA1 SHA512 SSDEEP

            Uninstall.exe

            • Path C:\Program Files\7-Zip\Uninstall.exe
            • Size 410KB
            • SHA256 97d771b0efc9dbc341981617839be9154237b16368a1ae38c4ea1e351043f527
            • MD5 SHA1 SHA512 SSDEEP

            AppVShNotify.exe

            • Path C:\Program Files\Common Files\microsoft shared\ClickToRun\AppVShNotify.exe
            • Size 672KB
            • SHA256 afc6a00eb3330922229ae42d9845af99de3cc1ea37fdb9a9b978a0d64604842e
            • MD5 SHA1 SHA512 SSDEEP

            IntegratedOffice.exe

            • Path C:\Program Files\Common Files\microsoft shared\ClickToRun\IntegratedOffice.exe
            • Size 4.5MB
            • SHA256 5c99ee7d0674a2be8b9bed4d39c0d9120763aedcefc70806c204b9b4200dbedc
            • MD5 SHA1 SHA512 SSDEEP

            MavInject32.exe

            • Path C:\Program Files\Common Files\microsoft shared\ClickToRun\MavInject32.exe
            • Size 738KB
            • SHA256 2159d4c19abf2e7a4f1e6472354761db7985220e0bd5efce777bd7b456679747
            • MD5 SHA1 SHA512 SSDEEP

            OfficeC2RClient.exe

            • Path C:\Program Files\Common Files\microsoft shared\ClickToRun\OfficeC2RClient.exe
            • Size 23.8MB
            • SHA256 e52c2ea638ed41d0aa7e6937cc67d2d13a56b042eee6100ff1796a2ebea42b76
            • MD5 SHA1 SHA512 SSDEEP

            appvcleaner.exe

            • Path C:\Program Files\Common Files\microsoft shared\ClickToRun\appvcleaner.exe
            • Size 2.5MB
            • SHA256 45f8b00ba9519898100a461d16eabe58aa7ceaaac096890fe3537e1f9c654649
            • MD5 SHA1 SHA512 SSDEEP

            elevation_service.exe

            • Path C:\Program Files\Google\Chrome\Application\106.0.5249.119\elevation_service.exe
            • Size 2.0MB
            • SHA256 79042032cf1bface0508d9b11befdce2ee04e1892732f0324cda96ae8a2bf27a
            • MD5 SHA1 SHA512 SSDEEP

            dbiljkph.tmp

            • Path C:\Users\Admin\AppData\Local\arrlnmkl\dbiljkph.tmp
            • Size 625KB
            • SHA256 6fa1c7368919df6c61350d5a49dc738f955c8c15948ba212ce12f1d95f256c22
            • MD5 SHA1 SHA512 SSDEEP

            powershell.exe

            • Path C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe
            • Size 818KB
            • SHA256 6ae5baaae8431f56e4fd43ac91b826663c4661f1e0f42a718ec8e075657c65cd
            • MD5 SHA1 SHA512 SSDEEP

            DiagnosticsHub.StandardCollector.Service.exe

            • Path C:\Windows\System32\DiagSvcs\DiagnosticsHub.StandardCollector.Service.exe
            • Size 487KB
            • SHA256 99395099473058dfdc29631022b3aed16a248fee65c5d8ba58d5824545c41512
            • MD5 SHA1 SHA512 SSDEEP

            FXSSVC.exe

            • Path C:\Windows\System32\FXSSVC.exe
            • Size 1.0MB
            • SHA256 1e9203ff791f3191ae04dad9b093342b0f16cab313de59b815f5383cbde2862f
            • MD5 SHA1 SHA512 SSDEEP

            alg.exe

            • Path C:\Windows\System32\alg.exe
            • Size 489KB
            • SHA256 b52133008be95f8e2661c64b875a323549fd8ad591871dedb7237e29b93012a9
            • MD5 SHA1 SHA512 SSDEEP

            msdtc.exe

            • Path C:\Windows\System32\msdtc.exe
            • Size 540KB
            • SHA256 898685bfcf59395ed98f31f236cb783ef9ece1ed6b4cf7d367c0d3ca9d89dcf0
            • MD5 SHA1 SHA512 SSDEEP

            msiexec.exe

            • Path C:\Windows\System32\msiexec.exe
            • Size 463KB
            • SHA256 77135b832cafb142fc4397c3a8f8bcd96be043f8579262e51e09e4506a3a1505
            • MD5 SHA1 SHA512 SSDEEP

            office2016setup.exe

            • Path C:\odt\office2016setup.exe
            • Size 5.4MB
            • SHA256 5048f38d6c515cf2cb640612a151c4aaf1f3fd547387c9567df899af60025b94
            • MD5 SHA1 SHA512 SSDEEP

            maintenanceservice.exe

            • Path \??\c:\program files (x86)\mozilla maintenance service\maintenanceservice.exe
            • Size 613KB
            • SHA256 9d66d6367529d43751890e62853062ad24e00c99bd0de2c92d77562772a439f1
            • MD5 SHA1 SHA512 SSDEEP

            ose.exe

            • Path \??\c:\program files\common files\microsoft shared\source engine\ose.exe
            • Size 637KB
            • SHA256 f562a35471bee57e00475450d1c2ff2260d40c06cef380ed09615d4aecc42018
            • MD5 SHA1 SHA512 SSDEEP

            Appvclient.exe

            • Path \??\c:\windows\system32\Appvclient.exe
            • Size 1.1MB
            • SHA256 db8c94361fd259d562e44def042b9260211be28488f207f7c75e4a8b0030b861
            • MD5 SHA1 SHA512 SSDEEP

            memory/1948-80-0x00007FF7BCDE0000-0x00007FF7BCF37000-memory.dmp

            memory/2044-87-0x0000000140000000-0x0000000140145000-memory.dmp

            memory/2044-49-0x0000000140000000-0x00000001401C2000-memory.dmp

            memory/2044-167-0x0000000140000000-0x0000000140145000-memory.dmp

            memory/2044-51-0x0000000140000000-0x00000001401C2000-memory.dmp

            memory/2092-46-0x0000000140000000-0x0000000140136000-memory.dmp

            memory/2092-103-0x0000000140000000-0x0000000140136000-memory.dmp

            memory/2092-23-0x0000000140000000-0x0000000140136000-memory.dmp

            memory/2604-0-0x0000000000D80000-0x0000000000E7D000-memory.dmp

            memory/2604-64-0x0000000000D80000-0x0000000000E7D000-memory.dmp

            memory/2604-3-0x0000000000D80000-0x0000000000E7D000-memory.dmp

            memory/2604-1-0x0000000000D80000-0x0000000000E7D000-memory.dmp

            memory/2776-116-0x0000000140000000-0x0000000140135000-memory.dmp

            memory/2776-40-0x0000000140000000-0x0000000140135000-memory.dmp

            memory/3100-178-0x0000000140000000-0x0000000140131000-memory.dmp

            memory/3100-104-0x0000000140000000-0x0000000140131000-memory.dmp