Analysis

  • max time kernel
    141s
  • max time network
    134s
  • platform
    windows7_x64
  • resource
    win7-20241010-en
  • resource tags

    arch:x64arch:x86image:win7-20241010-enlocale:en-usos:windows7-x64system
  • submitted
    04/01/2025, 01:03

General

  • Target
    DOCUMENT.exe
  • Size 941KB
  • Sample250104-bevx8asphx
  • SHA256 7b6570a85ef1600456266810593fd5e2de186f34ed7868ace12148ec14f8812e
  • MD5 SHA1 SHA512 SSDEEP

Malware Config

Signatures

  • ISR Stealer

    ISR Stealer is a modified version of Hackhound Stealer written in visual basic.

  • ISR Stealer payload 1 IoCs
  • Isrstealer family
  • Modifies visiblity of hidden/system files in Explorer 2 TTPs 3 IoCs
  • Detected Nirsoft tools 3 IoCs

    Free utilities often used by attackers which can steal passwords, product keys, etc.

  • NirSoft MailPassView 3 IoCs

    Password recovery tool for various email clients

  • Executes dropped EXE 4 IoCs
  • Loads dropped DLL 7 IoCs
  • Accesses Microsoft Outlook accounts 1 TTPs 3 IoCs
  • Adds Run key to start application 2 TTPs 3 IoCs
  • Checks whether UAC is enabled 1 TTPs 3 IoCs
  • Suspicious use of SetThreadContext 9 IoCs
  • UPX packed file 20 IoCs

    Detects executables packed with UPX/modified UPX open source packer.

  • Enumerates physical storage devices 1 TTPs

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

  • System Location Discovery: System Language Discovery 1 TTPs 17 IoCs

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

  • Suspicious behavior: EnumeratesProcesses 64 IoCs
  • Suspicious use of AdjustPrivilegeToken 3 IoCs
  • Suspicious use of SetWindowsHookEx 3 IoCs
  • Suspicious use of WriteProcessMemory 64 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\DOCUMENT.exe
    "C:\Users\Admin\AppData\Local\Temp\DOCUMENT.exe"
    1⤵
    • Loads dropped DLL
    • System Location Discovery: System Language Discovery
    • Suspicious use of WriteProcessMemory
    PID:2888
    • C:\Users\Admin\AcrbRd32.exe
      "C:\Users\Admin\AcrbRd32.exe" qVyh.BVI
      2⤵
      • Modifies visiblity of hidden/system files in Explorer
      • Executes dropped EXE
      • Adds Run key to start application
      • Checks whether UAC is enabled
      • Suspicious use of SetThreadContext
      • System Location Discovery: System Language Discovery
      • Suspicious behavior: EnumeratesProcesses
      • Suspicious use of AdjustPrivilegeToken
      • Suspicious use of WriteProcessMemory
      PID:688
      • C:\Windows\Microsoft.NET\Framework\v2.0.50727\RegSvcs.exe
        "C:\Windows\Microsoft.NET\Framework\v2.0.50727\RegSvcs.exe"
        3⤵
        • Suspicious use of SetThreadContext
        • System Location Discovery: System Language Discovery
        • Suspicious use of SetWindowsHookEx
        • Suspicious use of WriteProcessMemory
        PID:2716
        • C:\Windows\Microsoft.NET\Framework\v2.0.50727\RegSvcs.exe
          /scomma "C:\Users\Admin\AppData\Local\Temp\jNpg9diLcC.ini"
          4⤵
          • System Location Discovery: System Language Discovery
          PID:2552
        • C:\Windows\Microsoft.NET\Framework\v2.0.50727\RegSvcs.exe
          /scomma "C:\Users\Admin\AppData\Local\Temp\IuEgIvL7tm.ini"
          4⤵
          • Accesses Microsoft Outlook accounts
          • System Location Discovery: System Language Discovery
          PID:1428
      • C:\Windows\SysWOW64\WScript.exe
        "C:\Windows\System32\WScript.exe" "C:\Users\Admin\run.vbs"
        3⤵
        • Loads dropped DLL
        • System Location Discovery: System Language Discovery
        • Suspicious use of WriteProcessMemory
        PID:2264
        • C:\Users\Admin\AcrbRd32.exe
          "C:\Users\Admin\AcrbRd32.exe" qVyh.BVI
          4⤵
          • Modifies visiblity of hidden/system files in Explorer
          • Executes dropped EXE
          • Adds Run key to start application
          • Checks whether UAC is enabled
          • Suspicious use of SetThreadContext
          • System Location Discovery: System Language Discovery
          • Suspicious behavior: EnumeratesProcesses
          • Suspicious use of AdjustPrivilegeToken
          • Suspicious use of WriteProcessMemory
          PID:2744
          • C:\Windows\Microsoft.NET\Framework\v2.0.50727\RegSvcs.exe
            "C:\Windows\Microsoft.NET\Framework\v2.0.50727\RegSvcs.exe"
            5⤵
            • Suspicious use of SetThreadContext
            • System Location Discovery: System Language Discovery
            • Suspicious use of SetWindowsHookEx
            • Suspicious use of WriteProcessMemory
            PID:2020
            • C:\Windows\Microsoft.NET\Framework\v2.0.50727\RegSvcs.exe
              /scomma "C:\Users\Admin\AppData\Local\Temp\XH8j8G7K1o.ini"
              6⤵
              • System Location Discovery: System Language Discovery
              PID:1924
            • C:\Windows\Microsoft.NET\Framework\v2.0.50727\RegSvcs.exe
              /scomma "C:\Users\Admin\AppData\Local\Temp\bNdwxZSYHU.ini"
              6⤵
              • Accesses Microsoft Outlook accounts
              • System Location Discovery: System Language Discovery
              PID:1684
          • C:\Windows\SysWOW64\WScript.exe
            "C:\Windows\System32\WScript.exe" "C:\Users\Admin\run.vbs"
            5⤵
            • Loads dropped DLL
            • System Location Discovery: System Language Discovery
            PID:2356
            • C:\Users\Admin\AcrbRd32.exe
              "C:\Users\Admin\AcrbRd32.exe" qVyh.BVI
              6⤵
              • Modifies visiblity of hidden/system files in Explorer
              • Executes dropped EXE
              • Adds Run key to start application
              • Checks whether UAC is enabled
              • Suspicious use of SetThreadContext
              • System Location Discovery: System Language Discovery
              • Suspicious behavior: EnumeratesProcesses
              • Suspicious use of AdjustPrivilegeToken
              PID:2396
              • C:\Windows\Microsoft.NET\Framework\v2.0.50727\RegSvcs.exe
                "C:\Windows\Microsoft.NET\Framework\v2.0.50727\RegSvcs.exe"
                7⤵
                • Suspicious use of SetThreadContext
                • System Location Discovery: System Language Discovery
                • Suspicious use of SetWindowsHookEx
                PID:2944
                • C:\Windows\Microsoft.NET\Framework\v2.0.50727\RegSvcs.exe
                  /scomma "C:\Users\Admin\AppData\Local\Temp\NkpO14G49R.ini"
                  8⤵
                  • System Location Discovery: System Language Discovery
                  PID:2956
                • C:\Windows\Microsoft.NET\Framework\v2.0.50727\RegSvcs.exe
                  /scomma "C:\Users\Admin\AppData\Local\Temp\IBZBDvyFMd.ini"
                  8⤵
                  • Accesses Microsoft Outlook accounts
                  • System Location Discovery: System Language Discovery
                  PID:2848
              • C:\Windows\SysWOW64\WScript.exe
                "C:\Windows\System32\WScript.exe" "C:\Users\Admin\run.vbs"
                7⤵
                • Loads dropped DLL
                • System Location Discovery: System Language Discovery
                PID:2628
                • C:\Users\Admin\AcrbRd32.exe
                  "C:\Users\Admin\AcrbRd32.exe" qVyh.BVI
                  8⤵
                  • Executes dropped EXE
                  • System Location Discovery: System Language Discovery
                  PID:768

Network

        MITRE ATT&CK Enterprise v15

        Replay Monitor

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        Downloads

        jNpg9diLcC.ini

        • Path C:\Users\Admin\AppData\Local\Temp\jNpg9diLcC.ini
        • Size 5B
        • SHA256 fcdcc2c46896915a1c695d6231f0fee336a668531b7a3da46178c80362546dba
        • MD5 SHA1 SHA512

        start.lnk

        • Path C:\Users\Admin\AppData\Roaming\MICROS~1\Windows\STARTM~1\Programs\Startup\start.lnk
        • Size 762B
        • SHA256 87270404a842beee65835cea037944c4f2d505dd1cc85504316e0e7d664941f0
        • MD5 SHA1 SHA512

        fqNvzVucd.WFW

        • Path C:\Users\Admin\fqNvzVucd.WFW
        • Size 176B
        • SHA256 5fb2f55f742ac03bd5a3abe456d0d20759d7edfe28019d7c1e537207371b51e1
        • MD5 SHA1 SHA512

        hfOIwMh.IYB

        • Path C:\Users\Admin\hfOIwMh.IYB
        • Size 260KB
        • SHA256 2242aee6f8ecb743d05f06dddd20545d833bf1b11362b9f8cead0b2791eb8ecc
        • MD5 SHA1 SHA512 SSDEEP

        qVyh.BVI

        • Path C:\Users\Admin\qVyh.BVI
        • Size 32.7MB
        • SHA256 653506def41220c523a49df251f861a84507174ff1e7bf0e5a2c4e662d30f8f0
        • MD5 SHA1 SHA512 SSDEEP

        run.vbs

        • Path C:\Users\Admin\run.vbs
        • Size 89B
        • SHA256 0738ae023c1220e39d62a54db1f19f8eab832c1e8787b0858574056bf2cfc43c
        • MD5 SHA1 SHA512

        AcrbRd32.exe

        • Path \Users\Admin\AcrbRd32.exe
        • Size 915KB
        • SHA256 66c1f3e71685f81f836e29e77844c737ceaa47ff787d6b233b05166973fa73ba
        • MD5 SHA1 SHA512 SSDEEP

        memory/1428-41-0x0000000000400000-0x000000000041F000-memory.dmp

        memory/1428-43-0x0000000000400000-0x000000000041F000-memory.dmp

        memory/1428-42-0x0000000000400000-0x000000000041F000-memory.dmp

        memory/1428-40-0x0000000000400000-0x000000000041F000-memory.dmp

        memory/1684-68-0x0000000000400000-0x000000000041F000-memory.dmp

        memory/1684-67-0x0000000000400000-0x000000000041F000-memory.dmp

        memory/1684-69-0x0000000000400000-0x000000000041F000-memory.dmp

        memory/1924-59-0x0000000000400000-0x0000000000453000-memory.dmp

        memory/1924-60-0x0000000000400000-0x0000000000453000-memory.dmp

        memory/1924-61-0x0000000000400000-0x0000000000453000-memory.dmp

        memory/2020-53-0x000000007EFDE000-0x000000007EFDF000-memory.dmp

        memory/2552-34-0x0000000000400000-0x0000000000453000-memory.dmp

        memory/2552-33-0x0000000000400000-0x0000000000453000-memory.dmp

        memory/2552-32-0x0000000000400000-0x0000000000453000-memory.dmp

        memory/2552-35-0x0000000000400000-0x0000000000453000-memory.dmp

        memory/2716-27-0x0000000000400000-0x0000000000442000-memory.dmp

        memory/2716-26-0x000000007EFDE000-0x000000007EFDF000-memory.dmp

        memory/2716-25-0x0000000000400000-0x0000000000442000-memory.dmp

        memory/2848-90-0x0000000000400000-0x000000000041F000-memory.dmp

        memory/2848-89-0x0000000000400000-0x000000000041F000-memory.dmp

        memory/2848-91-0x0000000000400000-0x000000000041F000-memory.dmp

        memory/2944-75-0x000000007EFDE000-0x000000007EFDF000-memory.dmp

        memory/2956-81-0x0000000000400000-0x0000000000453000-memory.dmp

        memory/2956-82-0x0000000000400000-0x0000000000453000-memory.dmp

        memory/2956-83-0x0000000000400000-0x0000000000453000-memory.dmp