Analysis

  • max time kernel
    149s
  • max time network
    156s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20260513-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20260513-enlocale:en-usos:windows10-2004-x64systemwindows
  • submitted
    01/06/2026, 14:34

General

  • Target
    tmpfmbbso0h.msi
  • Size 9.3MB
  • Sample260601-rxea7ahv2q
  • SHA256 747e9cc899e32182bcca6d6bda20cdf87e07efb78fd84b6c305c1e02b22ba04e
  • MD5 SHA1 SHA512 SSDEEP TLSH

Malware Config

Signatures

  • Family: DeerStealer

    DeerStealer is a sophisticated information stealer written in C++.

  • Family: HijackLoader, IDAT loader, Ghostulse,

    HijackLoader is a multi-stage loader, first seen in 2023.

  • Detects DeerStealer 9 IoCs
  • Detects HijackLoader (aka IDAT Loader) 1 IoCs
  • Executes dropped EXE 12 IoCs
  • Loads dropped DLL 12 IoCs
  • Enumerates connected drives 3 TTPs 46 IoCs

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

  • Suspicious use of SetThreadContext 1 IoCs
  • Enumerates physical storage devices 1 TTPs

    Attempts to interact with connected storage/optical drive(s).

  • Event Triggered Execution: Installer Packages 2 TTPs 1 IoCs
  • System Location Discovery: System Language Discovery 1 TTPs 4 IoCs

    Attempt gather information about the system language of a victim in order to infer the geographical location of that host.

  • Suspicious behavior: EnumeratesProcesses 5 IoCs
  • Suspicious behavior: MapViewOfSection 2 IoCs
  • Suspicious use of AdjustPrivilegeToken 64 IoCs
  • Suspicious use of FindShellTrayWindow 2 IoCs
  • Suspicious use of WriteProcessMemory 17 IoCs

Processes

  • C:\Windows\system32\msiexec.exe
    msiexec.exe /I C:\Users\Admin\AppData\Local\Temp\tmpfmbbso0h.msi
    1⤵
    • Enumerates connected drives
    • Event Triggered Execution: Installer Packages
    • Suspicious use of AdjustPrivilegeToken
    • Suspicious use of FindShellTrayWindow
    PID:1616
  • C:\Windows\system32\msiexec.exe
    C:\Windows\system32\msiexec.exe /V
    1⤵
    • Enumerates connected drives
    • Suspicious use of AdjustPrivilegeToken
    • Suspicious use of WriteProcessMemory
    PID:5072
    • C:\Windows\syswow64\MsiExec.exe
      C:\Windows\syswow64\MsiExec.exe -Embedding F0675DC96678D32B982003894D99D197 C
      2⤵
      • Loads dropped DLL
      • System Location Discovery: System Language Discovery
      • Suspicious use of WriteProcessMemory
      PID:936
      • C:\Users\Admin\AppData\Local\Temp\{2A8726FE-BFAC-442C-BD9C-90484E60DFF0}\ISBEW64.exe
        C:\Users\Admin\AppData\Local\Temp\{2A8726FE-BFAC-442C-BD9C-90484E60DFF0}\ISBEW64.exe {EFB7539B-24F3-46B6-AF6E-3B021B51EFEF}:{A7CB4CF0-11DE-4ADF-A3A0-015797A54E74}
        3⤵
        • Executes dropped EXE
        PID:1844
      • C:\Users\Admin\AppData\Local\Temp\{2A8726FE-BFAC-442C-BD9C-90484E60DFF0}\ISBEW64.exe
        C:\Users\Admin\AppData\Local\Temp\{2A8726FE-BFAC-442C-BD9C-90484E60DFF0}\ISBEW64.exe {EFB7539B-24F3-46B6-AF6E-3B021B51EFEF}:{8BF87CE5-0584-411C-B199-DC61D2568FA7}
        3⤵
        • Executes dropped EXE
        PID:5212
      • C:\Users\Admin\AppData\Local\Temp\{2A8726FE-BFAC-442C-BD9C-90484E60DFF0}\ISBEW64.exe
        C:\Users\Admin\AppData\Local\Temp\{2A8726FE-BFAC-442C-BD9C-90484E60DFF0}\ISBEW64.exe {EFB7539B-24F3-46B6-AF6E-3B021B51EFEF}:{FE8E57AC-7761-4605-ADDF-CFFD2FD5CB3D}
        3⤵
        • Executes dropped EXE
        PID:3828
      • C:\Users\Admin\AppData\Local\Temp\{2A8726FE-BFAC-442C-BD9C-90484E60DFF0}\ISBEW64.exe
        C:\Users\Admin\AppData\Local\Temp\{2A8726FE-BFAC-442C-BD9C-90484E60DFF0}\ISBEW64.exe {EFB7539B-24F3-46B6-AF6E-3B021B51EFEF}:{DFDCA60E-DFA4-4089-8A49-EC9E05CA8313}
        3⤵
        • Executes dropped EXE
        PID:1220
      • C:\Users\Admin\AppData\Local\Temp\{2A8726FE-BFAC-442C-BD9C-90484E60DFF0}\ISBEW64.exe
        C:\Users\Admin\AppData\Local\Temp\{2A8726FE-BFAC-442C-BD9C-90484E60DFF0}\ISBEW64.exe {EFB7539B-24F3-46B6-AF6E-3B021B51EFEF}:{3142DF8E-78E5-4109-8E8E-4659B956330F}
        3⤵
        • Executes dropped EXE
        PID:4220
      • C:\Users\Admin\AppData\Local\Temp\{2A8726FE-BFAC-442C-BD9C-90484E60DFF0}\ISBEW64.exe
        C:\Users\Admin\AppData\Local\Temp\{2A8726FE-BFAC-442C-BD9C-90484E60DFF0}\ISBEW64.exe {EFB7539B-24F3-46B6-AF6E-3B021B51EFEF}:{4E04A08F-F8B1-4087-8FA9-02BF9BBEF239}
        3⤵
        • Executes dropped EXE
        PID:3616
      • C:\Users\Admin\AppData\Local\Temp\{2A8726FE-BFAC-442C-BD9C-90484E60DFF0}\ISBEW64.exe
        C:\Users\Admin\AppData\Local\Temp\{2A8726FE-BFAC-442C-BD9C-90484E60DFF0}\ISBEW64.exe {EFB7539B-24F3-46B6-AF6E-3B021B51EFEF}:{D82F7E38-1FE6-4731-9913-8C7881320197}
        3⤵
        • Executes dropped EXE
        PID:5780
      • C:\Users\Admin\AppData\Local\Temp\{2A8726FE-BFAC-442C-BD9C-90484E60DFF0}\ISBEW64.exe
        C:\Users\Admin\AppData\Local\Temp\{2A8726FE-BFAC-442C-BD9C-90484E60DFF0}\ISBEW64.exe {EFB7539B-24F3-46B6-AF6E-3B021B51EFEF}:{75C201C8-7DC7-4720-B47E-3AC553B2B73E}
        3⤵
        • Executes dropped EXE
        PID:2420
      • C:\Users\Admin\AppData\Local\Temp\{2A8726FE-BFAC-442C-BD9C-90484E60DFF0}\ISBEW64.exe
        C:\Users\Admin\AppData\Local\Temp\{2A8726FE-BFAC-442C-BD9C-90484E60DFF0}\ISBEW64.exe {EFB7539B-24F3-46B6-AF6E-3B021B51EFEF}:{F3FB31BA-4AFA-48C1-9F5B-FA7BB4ACD67F}
        3⤵
        • Executes dropped EXE
        PID:4444
      • C:\Users\Admin\AppData\Local\Temp\{2A8726FE-BFAC-442C-BD9C-90484E60DFF0}\ISBEW64.exe
        C:\Users\Admin\AppData\Local\Temp\{2A8726FE-BFAC-442C-BD9C-90484E60DFF0}\ISBEW64.exe {EFB7539B-24F3-46B6-AF6E-3B021B51EFEF}:{776856F7-F3DD-4EBB-9355-4CE332EDA4CC}
        3⤵
        • Executes dropped EXE
        PID:2392
      • C:\Users\Admin\AppData\Local\Temp\{21E1857E-2275-448E-96A5-9E8F9F12BA12}\SplashWin.exe
        C:\Users\Admin\AppData\Local\Temp\{21E1857E-2275-448E-96A5-9E8F9F12BA12}\SplashWin.exe
        3⤵
        • Executes dropped EXE
        • Loads dropped DLL
        • System Location Discovery: System Language Discovery
        • Suspicious behavior: EnumeratesProcesses
        • Suspicious use of WriteProcessMemory
        PID:704
        • C:\Users\Admin\AppData\Roaming\demofirefox\SplashWin.exe
          C:\Users\Admin\AppData\Roaming\demofirefox\SplashWin.exe
          4⤵
          • Executes dropped EXE
          • Loads dropped DLL
          • Suspicious use of SetThreadContext
          • System Location Discovery: System Language Discovery
          • Suspicious behavior: EnumeratesProcesses
          • Suspicious behavior: MapViewOfSection
          • Suspicious use of WriteProcessMemory
          PID:3424
          • C:\Windows\SysWOW64\cmd.exe
            C:\Windows\SysWOW64\cmd.exe
            5⤵
            • System Location Discovery: System Language Discovery
            • Suspicious behavior: EnumeratesProcesses
            • Suspicious behavior: MapViewOfSection
            • Suspicious use of WriteProcessMemory
            PID:3216
            • C:\Users\Admin\AppData\Local\Temp\localUpdate_alpha.exe
              C:\Users\Admin\AppData\Local\Temp\localUpdate_alpha.exe
              6⤵
              • Loads dropped DLL
              PID:5264

Network

        MITRE ATT&CK Enterprise v16

        Replay Monitor

        Loading Replay Monitor...

        Downloads

        MSI932.tmp

        • Path C:\Users\Admin\AppData\Local\Temp\MSI932.tmp
        • Size 171KB
        • SHA256 b8fa7aa425e4084ea3721780a13d11e08b8d53d1c5414b73f22faeca1bfd314f
        • MD5 SHA1 SHA512 SSDEEP TLSH

        MSIB37.tmp

        • Path C:\Users\Admin\AppData\Local\Temp\MSIB37.tmp
        • Size 2.5MB
        • SHA256 315dd6cb35097e0d85c5133048717c0669db06060c15cdc03a995dfdeb9c22ed
        • MD5 SHA1 SHA512 SSDEEP TLSH

        d28e4ccc

        • Path C:\Users\Admin\AppData\Local\Temp\d28e4ccc
        • Size 5.4MB
        • SHA256 fabc27b22b509601dd16ce26e8bc441a2d5d2c403ecb91c0dd19d85a39dc585b
        • MD5 SHA1 SHA512 SSDEEP TLSH

        localUpdate_alpha.exe

        • Path C:\Users\Admin\AppData\Local\Temp\localUpdate_alpha.exe
        • Size 2.3MB
        • SHA256 b22bf1210b5fd173a210ebfa9092390aa0513c41e1914cbe161eb547f049ef91
        • MD5 SHA1 SHA512 SSDEEP TLSH

        DuiLib_u.dll

        • Path C:\Users\Admin\AppData\Local\Temp\{21E1857E-2275-448E-96A5-9E8F9F12BA12}\DuiLib_u.dll
        • Size 840KB
        • SHA256 8d11e5e24f3f4454b3bcddc3b6ad8848c4bc7bdb96bb6375188b1f5d44e84a6a
        • MD5 SHA1 SHA512 SSDEEP TLSH

        SplashWin.exe

        • Path C:\Users\Admin\AppData\Local\Temp\{21E1857E-2275-448E-96A5-9E8F9F12BA12}\SplashWin.exe
        • Size 446KB
        • SHA256 c5e650b331fa5292872fdaede3a75c8167a0f1280ce0cd3d58b880d23854bdb1
        • MD5 SHA1 SHA512 SSDEEP TLSH

        VCRUNTIME140.dll

        • Path C:\Users\Admin\AppData\Local\Temp\{21E1857E-2275-448E-96A5-9E8F9F12BA12}\VCRUNTIME140.dll
        • Size 74KB
        • SHA256 e610cdac0a37147919032d0d723b967276c217ff06ea402f098696ab4112512a
        • MD5 SHA1 SHA512 SSDEEP TLSH

        horoscope.html

        • Path C:\Users\Admin\AppData\Local\Temp\{21E1857E-2275-448E-96A5-9E8F9F12BA12}\horoscope.html
        • Size 45KB
        • SHA256 f709a1b33efaa8ecd4070193803aea5986c4ddacb8846ad8612605679b1096c5
        • MD5 SHA1 SHA512 SSDEEP TLSH

        msvcp140.dll

        • Path C:\Users\Admin\AppData\Local\Temp\{21E1857E-2275-448E-96A5-9E8F9F12BA12}\msvcp140.dll
        • Size 437KB
        • SHA256 4cb882621a3d1c6283570447f842801b396db1b3dcd2e01c2f7002efd66a0a97
        • MD5 SHA1 SHA512 SSDEEP TLSH

        reremouse.apk

        • Path C:\Users\Admin\AppData\Local\Temp\{21E1857E-2275-448E-96A5-9E8F9F12BA12}\reremouse.apk
        • Size 4.3MB
        • SHA256 a6151658dbac3f241832c9e0059a35cad1346f37796485d2ebbd993a94f4f255
        • MD5 SHA1 SHA512 SSDEEP TLSH

        ISBEW64.exe

        • Path C:\Users\Admin\AppData\Local\Temp\{2A8726FE-BFAC-442C-BD9C-90484E60DFF0}\ISBEW64.exe
        • Size 178KB
        • SHA256 561f14cdece85b38617403e1c525ff0b1b752303797894607a4615d0bd66f97f
        • MD5 SHA1 SHA512 SSDEEP TLSH

        ISRT.dll

        • Path C:\Users\Admin\AppData\Local\Temp\{2A8726FE-BFAC-442C-BD9C-90484E60DFF0}\ISRT.dll
        • Size 426KB
        • SHA256 58a724d23c63387a2dda27ccfdbc8ca87fd4db671bea8bb636247667f6a5a11e
        • MD5 SHA1 SHA512 SSDEEP TLSH

        _isres_0x0409.dll

        • Path C:\Users\Admin\AppData\Local\Temp\{2A8726FE-BFAC-442C-BD9C-90484E60DFF0}\_isres_0x0409.dll
        • Size 1.8MB
        • SHA256 bd32468ee7e8885323f22eabbff9763a0f6ffef3cc151e0bd0481df5888f4152
        • MD5 SHA1 SHA512 SSDEEP TLSH

        memory/704-60-0x0000000074030000-0x00000000741AB000-memory.dmp

        memory/704-61-0x00007FFED10B0000-0x00007FFED12A5000-memory.dmp

        memory/936-39-0x0000000003760000-0x0000000003927000-memory.dmp

        memory/936-34-0x0000000010000000-0x0000000010114000-memory.dmp

        memory/3216-89-0x00007FFED10B0000-0x00007FFED12A5000-memory.dmp

        memory/3216-92-0x00000000756C0000-0x000000007583B000-memory.dmp

        memory/3424-85-0x00007FFED10B0000-0x00007FFED12A5000-memory.dmp

        memory/3424-86-0x00000000756C0000-0x000000007583B000-memory.dmp

        memory/3424-84-0x00000000756C0000-0x000000007583B000-memory.dmp

        memory/5264-99-0x00007FF6B0490000-0x00007FF6B079E000-memory.dmp

        memory/5264-100-0x00007FF6B0490000-0x00007FF6B079E000-memory.dmp

        memory/5264-101-0x00007FF6B0490000-0x00007FF6B079E000-memory.dmp

        memory/5264-108-0x00007FF6B0490000-0x00007FF6B079E000-memory.dmp

        memory/5264-110-0x00007FF6B0490000-0x00007FF6B079E000-memory.dmp

        memory/5264-113-0x00007FF6B0490000-0x00007FF6B079E000-memory.dmp

        memory/5264-114-0x00007FF6B0490000-0x00007FF6B079E000-memory.dmp

        memory/5264-115-0x00007FF6B0490000-0x00007FF6B079E000-memory.dmp

        memory/5264-117-0x00007FF6B0490000-0x00007FF6B079E000-memory.dmp

        memory/5264-119-0x00007FF6B0490000-0x00007FF6B079E000-memory.dmp

        memory/5264-120-0x00007FF6B0490000-0x00007FF6B079E000-memory.dmp