Analysis

  • max time kernel
    72s
  • max time network
    149s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20220812-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20220812-enlocale:en-usos:windows10-2004-x64system
  • submitted
    23/12/2022, 08:46

General

  • Target

    file.exe

  • Size

    1.9MB

  • MD5

    ee462a073733b708fe893763a74df0ca

  • SHA1

    7fd26ac78dc92596084a420146a887903f827049

  • SHA256

    227636537279b4f263ea16cd1fb60b11cd0086769e165bd381bd2603c73c7eea

  • SHA512

    bfa2227b294a5d5ab43f945b17764ccb422b3d2872cbbaee256b9e6904b8ac741e0eb629277f40b847d2ef5b30859805fd877e262af1efd534dc5a06e2cff625

  • SSDEEP

    49152:/duFwjaEQRW247LLtWUXK7DVUT4/Fl8z70JbPcSz/pja0WP7p3N:/duKGEQcUNf6AbEshhGdN

Score
10/10

Malware Config

Extracted

Family

nymaim

C2

45.139.105.171

85.31.46.167

Signatures

  • NyMaim

    NyMaim is a malware with various capabilities written in C++ and first seen in 2013.

  • Executes dropped EXE 3 IoCs
  • Checks computer location settings 2 TTPs 1 IoCs

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

  • Loads dropped DLL 1 IoCs
  • Checks installed software on the system 1 TTPs

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

  • Drops file in Program Files directory 17 IoCs
  • Enumerates physical storage devices 1 TTPs

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

  • Kills process with taskkill 1 IoCs
  • Suspicious behavior: EnumeratesProcesses 6 IoCs
  • Suspicious use of AdjustPrivilegeToken 1 IoCs
  • Suspicious use of WriteProcessMemory 15 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\file.exe
    "C:\Users\Admin\AppData\Local\Temp\file.exe"
    1⤵
    • Suspicious use of WriteProcessMemory
    PID:2368
    • C:\Users\Admin\AppData\Local\Temp\is-F1BOD.tmp\is-DMTG0.tmp
      "C:\Users\Admin\AppData\Local\Temp\is-F1BOD.tmp\is-DMTG0.tmp" /SL4 $701F2 "C:\Users\Admin\AppData\Local\Temp\file.exe" 1788156 133120
      2⤵
      • Executes dropped EXE
      • Loads dropped DLL
      • Drops file in Program Files directory
      • Suspicious use of WriteProcessMemory
      PID:4236
      • C:\Program Files (x86)\Split Files\SplitFiles118.exe
        "C:\Program Files (x86)\Split Files\SplitFiles118.exe"
        3⤵
        • Executes dropped EXE
        • Checks computer location settings
        • Suspicious behavior: EnumeratesProcesses
        • Suspicious use of WriteProcessMemory
        PID:4224
        • C:\Users\Admin\AppData\Roaming\{99cae5c0-1ab4-11ed-899c-806e6f6e6963}\rruxlkk1R.exe
          4⤵
          • Executes dropped EXE
          PID:1216
        • C:\Windows\SysWOW64\cmd.exe
          "C:\Windows\System32\cmd.exe" /c taskkill /im "SplitFiles118.exe" /f & erase "C:\Program Files (x86)\Split Files\SplitFiles118.exe" & exit
          4⤵
          • Suspicious use of WriteProcessMemory
          PID:2236
          • C:\Windows\SysWOW64\taskkill.exe
            taskkill /im "SplitFiles118.exe" /f
            5⤵
            • Kills process with taskkill
            • Suspicious use of AdjustPrivilegeToken
            PID:4952

Network

        MITRE ATT&CK Enterprise v6

        Replay Monitor

        Loading Replay Monitor...

        Downloads

        • C:\Program Files (x86)\Split Files\SplitFiles118.exe

          Filesize

          3.3MB

          MD5

          a41341f861fb5f7b9782154af3f08bc1

          SHA1

          f353b3531ea73e728fc45372316b4ae4fa1710ee

          SHA256

          a3bbe8d481b68487f0e5522b14232d43b02dd1979ec18892a4f4207796d94e69

          SHA512

          5417c2116e4e0aded40f3402210c85087a4dabe43ba55d888b16ebd80390d0ccb4cb46acbe36935af0428cb1d7351bdbf067081a2c1ccfc749959badd385a68d

        • C:\Program Files (x86)\Split Files\SplitFiles118.exe

          Filesize

          3.3MB

          MD5

          a41341f861fb5f7b9782154af3f08bc1

          SHA1

          f353b3531ea73e728fc45372316b4ae4fa1710ee

          SHA256

          a3bbe8d481b68487f0e5522b14232d43b02dd1979ec18892a4f4207796d94e69

          SHA512

          5417c2116e4e0aded40f3402210c85087a4dabe43ba55d888b16ebd80390d0ccb4cb46acbe36935af0428cb1d7351bdbf067081a2c1ccfc749959badd385a68d

        • C:\Users\Admin\AppData\Local\Temp\is-F1BOD.tmp\is-DMTG0.tmp

          Filesize

          723KB

          MD5

          703b4da86c2d38881230d26bc1051cb2

          SHA1

          13b9e7582e94cb6e4f703bc08a28c53cdc003019

          SHA256

          90b8f255f68be9f092608be15074b6fc3c4be724ae82dae5adb390307b121c89

          SHA512

          e3d80bc78b41e24450effe46f713e9bf7fcd376141a3c6b3f20e3ec81c9c3ab85d300104b2dbbef9512f92a2b613dbc326899e442dc669490c1e192f79a7363b

        • C:\Users\Admin\AppData\Local\Temp\is-F1BOD.tmp\is-DMTG0.tmp

          Filesize

          723KB

          MD5

          703b4da86c2d38881230d26bc1051cb2

          SHA1

          13b9e7582e94cb6e4f703bc08a28c53cdc003019

          SHA256

          90b8f255f68be9f092608be15074b6fc3c4be724ae82dae5adb390307b121c89

          SHA512

          e3d80bc78b41e24450effe46f713e9bf7fcd376141a3c6b3f20e3ec81c9c3ab85d300104b2dbbef9512f92a2b613dbc326899e442dc669490c1e192f79a7363b

        • C:\Users\Admin\AppData\Local\Temp\is-LTKI7.tmp\_iscrypt.dll

          Filesize

          2KB

          MD5

          a69559718ab506675e907fe49deb71e9

          SHA1

          bc8f404ffdb1960b50c12ff9413c893b56f2e36f

          SHA256

          2f6294f9aa09f59a574b5dcd33be54e16b39377984f3d5658cda44950fa0f8fc

          SHA512

          e52e0aa7fe3f79e36330c455d944653d449ba05b2f9abee0914a0910c3452cfa679a40441f9ac696b3ccf9445cbb85095747e86153402fc362bb30ac08249a63

        • C:\Users\Admin\AppData\Roaming\{99cae5c0-1ab4-11ed-899c-806e6f6e6963}\rruxlkk1R.exe

          Filesize

          72KB

          MD5

          3fb36cb0b7172e5298d2992d42984d06

          SHA1

          439827777df4a337cbb9fa4a4640d0d3fa1738b7

          SHA256

          27ae813ceff8aa56e9fa68c8e50bb1c6c4a01636015eac4bd8bf444afb7020d6

          SHA512

          6b39cb32d77200209a25080ac92bc71b1f468e2946b651023793f3585ee6034adc70924dbd751cf4a51b5e71377854f1ab43c2dd287d4837e7b544ff886f470c

        • C:\Users\Admin\AppData\Roaming\{99cae5c0-1ab4-11ed-899c-806e6f6e6963}\rruxlkk1R.exe

          Filesize

          72KB

          MD5

          3fb36cb0b7172e5298d2992d42984d06

          SHA1

          439827777df4a337cbb9fa4a4640d0d3fa1738b7

          SHA256

          27ae813ceff8aa56e9fa68c8e50bb1c6c4a01636015eac4bd8bf444afb7020d6

          SHA512

          6b39cb32d77200209a25080ac92bc71b1f468e2946b651023793f3585ee6034adc70924dbd751cf4a51b5e71377854f1ab43c2dd287d4837e7b544ff886f470c

        • memory/2368-159-0x0000000000400000-0x0000000000427000-memory.dmp

          Filesize

          156KB

        • memory/2368-141-0x0000000000400000-0x0000000000427000-memory.dmp

          Filesize

          156KB

        • memory/2368-135-0x0000000000400000-0x0000000000427000-memory.dmp

          Filesize

          156KB

        • memory/4224-146-0x0000000000400000-0x000000000154D000-memory.dmp

          Filesize

          17.3MB

        • memory/4224-147-0x0000000000400000-0x000000000154D000-memory.dmp

          Filesize

          17.3MB

        • memory/4224-145-0x0000000000400000-0x000000000154D000-memory.dmp

          Filesize

          17.3MB

        • memory/4224-151-0x0000000010000000-0x000000001001B000-memory.dmp

          Filesize

          108KB

        • memory/4224-155-0x0000000000400000-0x000000000154D000-memory.dmp

          Filesize

          17.3MB

        • memory/4224-158-0x0000000000400000-0x000000000154D000-memory.dmp

          Filesize

          17.3MB