Analysis

  • max time kernel
    151s
  • max time network
    156s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20220901-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20220901-enlocale:en-usos:windows10-2004-x64system
  • submitted
    06-11-2022 08:58

General

  • Target

    4d9e8df04a11f124a839d4c3e59eeba7302e9c26e06b31dd561eb446ae267a07.exe

  • Size

    358KB

  • MD5

    5709c6a4da3cea082e45480ce2f97a60

  • SHA1

    6d8eed5918879e75ff3e3e80dd4f5dc87ac14355

  • SHA256

    4d9e8df04a11f124a839d4c3e59eeba7302e9c26e06b31dd561eb446ae267a07

  • SHA512

    5ab1ae6b66ca7e5fb6cf11037e27d8b1b7f00bbd0f96ca6827116714429314c7435a64a65efb6f85cf6198198d52559c621485c284249fb8cf082639c5f252b5

  • SSDEEP

    6144:XABPDbnTXGxIBtPr+wKVa10gJDfIiFIULcnw5KrTsioFaj0uCDHphVmMjX58:XABPDbTXGxIBZSwb1ZfZsrToF00uCDN5

Malware Config

Signatures

  • ISR Stealer

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

  • ISR Stealer payload 4 IoCs
  • NirSoft MailPassView 2 IoCs

    Password recovery tool for various email clients

  • Nirsoft 2 IoCs
  • Executes dropped EXE 5 IoCs
  • UPX packed file 4 IoCs

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

  • Checks computer location settings 2 TTPs 1 IoCs

    Looks up country code configured in the registry, likely geofence.

  • Accesses Microsoft Outlook accounts 1 TTPs 1 IoCs
  • Suspicious use of SetThreadContext 4 IoCs
  • Enumerates physical storage devices 1 TTPs

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

  • Program crash 1 IoCs
  • Suspicious behavior: EnumeratesProcesses 64 IoCs
  • Suspicious use of AdjustPrivilegeToken 3 IoCs
  • Suspicious use of SetWindowsHookEx 1 IoCs
  • Suspicious use of WriteProcessMemory 36 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\4d9e8df04a11f124a839d4c3e59eeba7302e9c26e06b31dd561eb446ae267a07.exe
    "C:\Users\Admin\AppData\Local\Temp\4d9e8df04a11f124a839d4c3e59eeba7302e9c26e06b31dd561eb446ae267a07.exe"
    1⤵
    • Checks computer location settings
    • Suspicious use of SetThreadContext
    • Suspicious behavior: EnumeratesProcesses
    • Suspicious use of AdjustPrivilegeToken
    • Suspicious use of WriteProcessMemory
    PID:4948
    • C:\Users\Admin\AppData\Local\Temp\4d9e8df04a11f124a839d4c3e59eeba7302e9c26e06b31dd561eb446ae267a07.exe
      "C:\Users\Admin\AppData\Local\Temp\4d9e8df04a11f124a839d4c3e59eeba7302e9c26e06b31dd561eb446ae267a07.exe"
      2⤵
        PID:3496
      • C:\Users\Admin\AppData\Roaming\Microsoft\Windows\CryptSvc.exe
        "C:\Users\Admin\AppData\Roaming\Microsoft\Windows\CryptSvc.exe"
        2⤵
        • Executes dropped EXE
        • Suspicious behavior: EnumeratesProcesses
        • Suspicious use of AdjustPrivilegeToken
        • Suspicious use of WriteProcessMemory
        PID:4392
        • C:\Users\Admin\AppData\Roaming\Microsoft\Windows\EFS.exe
          C:\Users\Admin\AppData\Roaming\Microsoft\Windows\EFS.exe
          3⤵
          • Executes dropped EXE
          • Suspicious use of SetThreadContext
          • Suspicious use of AdjustPrivilegeToken
          • Suspicious use of WriteProcessMemory
          PID:2700
          • C:\Users\Admin\AppData\Roaming\Microsoft\Windows\EFS.exe
            "C:\Users\Admin\AppData\Roaming\Microsoft\Windows\EFS.exe"
            4⤵
            • Executes dropped EXE
            • Suspicious use of SetThreadContext
            • Suspicious use of SetWindowsHookEx
            • Suspicious use of WriteProcessMemory
            PID:4260
            • C:\Users\Admin\AppData\Roaming\Microsoft\Windows\EFS.exe
              /scomma "C:\Users\Admin\AppData\Local\Temp\mBWK4LB8aG.ini"
              5⤵
              • Executes dropped EXE
              PID:1916
              • C:\Windows\SysWOW64\WerFault.exe
                C:\Windows\SysWOW64\WerFault.exe -u -p 1916 -s 80
                6⤵
                • Program crash
                PID:4832
            • C:\Users\Admin\AppData\Roaming\Microsoft\Windows\EFS.exe
              /scomma "C:\Users\Admin\AppData\Local\Temp\IuEeNg3yIY.ini"
              5⤵
              • Executes dropped EXE
              • Accesses Microsoft Outlook accounts
              PID:4368
    • C:\Windows\SysWOW64\WerFault.exe
      C:\Windows\SysWOW64\WerFault.exe -pss -s 408 -p 1916 -ip 1916
      1⤵
        PID:4048

      Network

      MITRE ATT&CK Enterprise v6

      Replay Monitor

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      Downloads

      • C:\Users\Admin\AppData\Roaming\Microsoft\Windows\CryptSvc.exe

        Filesize

        9KB

        MD5

        cd53082af28f46603b899c69fb8e449f

        SHA1

        d0034c9b7427cc0e045a5a5696870d988f96fbd1

        SHA256

        30ef28dbc8c9e308ae559d1bce7c4338c1c4d94ee3700bfe09dfc5b816bb5704

        SHA512

        cf62c72a417d2fb473fdc721b0c88d9cad8527d18658021af2ad825c8de1c1cb1544593aa4b1519f9a1d1401959efa21954cdb9065753a91922b520f96f5478e

      • C:\Users\Admin\AppData\Roaming\Microsoft\Windows\CryptSvc.exe

        Filesize

        9KB

        MD5

        cd53082af28f46603b899c69fb8e449f

        SHA1

        d0034c9b7427cc0e045a5a5696870d988f96fbd1

        SHA256

        30ef28dbc8c9e308ae559d1bce7c4338c1c4d94ee3700bfe09dfc5b816bb5704

        SHA512

        cf62c72a417d2fb473fdc721b0c88d9cad8527d18658021af2ad825c8de1c1cb1544593aa4b1519f9a1d1401959efa21954cdb9065753a91922b520f96f5478e

      • C:\Users\Admin\AppData\Roaming\Microsoft\Windows\EFS.exe

        Filesize

        358KB

        MD5

        5709c6a4da3cea082e45480ce2f97a60

        SHA1

        6d8eed5918879e75ff3e3e80dd4f5dc87ac14355

        SHA256

        4d9e8df04a11f124a839d4c3e59eeba7302e9c26e06b31dd561eb446ae267a07

        SHA512

        5ab1ae6b66ca7e5fb6cf11037e27d8b1b7f00bbd0f96ca6827116714429314c7435a64a65efb6f85cf6198198d52559c621485c284249fb8cf082639c5f252b5

      • C:\Users\Admin\AppData\Roaming\Microsoft\Windows\EFS.exe

        Filesize

        358KB

        MD5

        5709c6a4da3cea082e45480ce2f97a60

        SHA1

        6d8eed5918879e75ff3e3e80dd4f5dc87ac14355

        SHA256

        4d9e8df04a11f124a839d4c3e59eeba7302e9c26e06b31dd561eb446ae267a07

        SHA512

        5ab1ae6b66ca7e5fb6cf11037e27d8b1b7f00bbd0f96ca6827116714429314c7435a64a65efb6f85cf6198198d52559c621485c284249fb8cf082639c5f252b5

      • C:\Users\Admin\AppData\Roaming\Microsoft\Windows\EFS.exe

        Filesize

        358KB

        MD5

        5709c6a4da3cea082e45480ce2f97a60

        SHA1

        6d8eed5918879e75ff3e3e80dd4f5dc87ac14355

        SHA256

        4d9e8df04a11f124a839d4c3e59eeba7302e9c26e06b31dd561eb446ae267a07

        SHA512

        5ab1ae6b66ca7e5fb6cf11037e27d8b1b7f00bbd0f96ca6827116714429314c7435a64a65efb6f85cf6198198d52559c621485c284249fb8cf082639c5f252b5

      • C:\Users\Admin\AppData\Roaming\Microsoft\Windows\EFS.exe

        Filesize

        358KB

        MD5

        5709c6a4da3cea082e45480ce2f97a60

        SHA1

        6d8eed5918879e75ff3e3e80dd4f5dc87ac14355

        SHA256

        4d9e8df04a11f124a839d4c3e59eeba7302e9c26e06b31dd561eb446ae267a07

        SHA512

        5ab1ae6b66ca7e5fb6cf11037e27d8b1b7f00bbd0f96ca6827116714429314c7435a64a65efb6f85cf6198198d52559c621485c284249fb8cf082639c5f252b5

      • C:\Users\Admin\AppData\Roaming\Microsoft\Windows\EFS.exe

        Filesize

        358KB

        MD5

        5709c6a4da3cea082e45480ce2f97a60

        SHA1

        6d8eed5918879e75ff3e3e80dd4f5dc87ac14355

        SHA256

        4d9e8df04a11f124a839d4c3e59eeba7302e9c26e06b31dd561eb446ae267a07

        SHA512

        5ab1ae6b66ca7e5fb6cf11037e27d8b1b7f00bbd0f96ca6827116714429314c7435a64a65efb6f85cf6198198d52559c621485c284249fb8cf082639c5f252b5

      • memory/2700-148-0x0000000074F90000-0x0000000075541000-memory.dmp

        Filesize

        5.7MB

      • memory/2700-146-0x0000000074F90000-0x0000000075541000-memory.dmp

        Filesize

        5.7MB

      • memory/3496-136-0x0000000000780000-0x00000000007C2000-memory.dmp

        Filesize

        264KB

      • memory/4260-160-0x0000000000400000-0x0000000000442000-memory.dmp

        Filesize

        264KB

      • memory/4260-168-0x0000000000400000-0x0000000000442000-memory.dmp

        Filesize

        264KB

      • memory/4260-154-0x0000000000400000-0x0000000000442000-memory.dmp

        Filesize

        264KB

      • memory/4368-167-0x0000000000400000-0x000000000041F000-memory.dmp

        Filesize

        124KB

      • memory/4368-166-0x0000000000400000-0x000000000041F000-memory.dmp

        Filesize

        124KB

      • memory/4368-165-0x0000000000400000-0x000000000041F000-memory.dmp

        Filesize

        124KB

      • memory/4368-162-0x0000000000400000-0x000000000041F000-memory.dmp

        Filesize

        124KB

      • memory/4392-142-0x0000000074F90000-0x0000000075541000-memory.dmp

        Filesize

        5.7MB

      • memory/4392-141-0x0000000074F90000-0x0000000075541000-memory.dmp

        Filesize

        5.7MB

      • memory/4392-147-0x0000000074F90000-0x0000000075541000-memory.dmp

        Filesize

        5.7MB

      • memory/4948-132-0x0000000074F90000-0x0000000075541000-memory.dmp

        Filesize

        5.7MB

      • memory/4948-133-0x0000000074F90000-0x0000000075541000-memory.dmp

        Filesize

        5.7MB

      • memory/4948-149-0x0000000074F90000-0x0000000075541000-memory.dmp

        Filesize

        5.7MB