Analysis

  • max time kernel
    91s
  • max time network
    139s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20221111-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20221111-enlocale:en-usos:windows10-2004-x64system
  • submitted
    29/12/2022, 03:49

General

  • Target

    file.exe

  • Size

    1.8MB

  • MD5

    96757e2b793503f1cf50e83e0c8158b3

  • SHA1

    0e81c657f632530055f976cb7f8de7245afe9762

  • SHA256

    e1e7b51b3fd1919a8fbd6deef2c1d1e8378c5d02a33610da31009c005b2bb64d

  • SHA512

    3157c38edc91bc3aa4c0060c1b747467320dba78ae6a06791701ea3946a2d5edea15f8d937dc6dc275f29e2af908eaab4a4803044fd13fd6336bda9373e11364

  • SSDEEP

    24576:CpniMxYPigDGbDDO1XXHZuRWQIEUYbbLtL+hUb1rtuKwPQ1LT4+ZlJruoPpMqa7B:gi9YDqNXHMsqEW3Rw2A4DuoPpMv7NL

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:2420
    • C:\Users\Admin\AppData\Local\Temp\is-QB85N.tmp\is-5N9AN.tmp
      "C:\Users\Admin\AppData\Local\Temp\is-QB85N.tmp\is-5N9AN.tmp" /SL4 $701D8 "C:\Users\Admin\AppData\Local\Temp\file.exe" 1588479 96768
      2⤵
      • Executes dropped EXE
      • Loads dropped DLL
      • Drops file in Program Files directory
      • Suspicious use of WriteProcessMemory
      PID:780
      • C:\Program Files (x86)\Split Files\SplitFiles124.exe
        "C:\Program Files (x86)\Split Files\SplitFiles124.exe"
        3⤵
        • Executes dropped EXE
        • Checks computer location settings
        • Suspicious behavior: EnumeratesProcesses
        • Suspicious use of WriteProcessMemory
        PID:1140
        • C:\Users\Admin\AppData\Roaming\{6cebb340-6208-11ed-bf50-806e6f6e6963}\N4ZzEMeML.exe
          4⤵
          • Executes dropped EXE
          PID:2784
        • C:\Windows\SysWOW64\cmd.exe
          "C:\Windows\System32\cmd.exe" /c taskkill /im "SplitFiles124.exe" /f & erase "C:\Program Files (x86)\Split Files\SplitFiles124.exe" & exit
          4⤵
          • Suspicious use of WriteProcessMemory
          PID:2632
          • C:\Windows\SysWOW64\taskkill.exe
            taskkill /im "SplitFiles124.exe" /f
            5⤵
            • Kills process with taskkill
            • Suspicious use of AdjustPrivilegeToken
            PID:2288

Network

MITRE ATT&CK Enterprise v6

Replay Monitor

Loading Replay Monitor...

Downloads

  • C:\Program Files (x86)\Split Files\SplitFiles124.exe

    Filesize

    3.1MB

    MD5

    30af2330d59fdc942c3fc9169d2c562d

    SHA1

    9558de6dc2846f85a601d2c629afba6ac22482a7

    SHA256

    bbc1e7d208cdc7a998588a662623f065fd52f32b16fec963c89ea02d9227d03c

    SHA512

    8af5c5c196ab65461b8d92b1ae7faaaff62a404a456af9c782cf90b470aea94d8b58ad9fe85f4cb1011f9884fec17577dd702944695f4462ecd53faf180fa4d0

  • C:\Program Files (x86)\Split Files\SplitFiles124.exe

    Filesize

    3.1MB

    MD5

    30af2330d59fdc942c3fc9169d2c562d

    SHA1

    9558de6dc2846f85a601d2c629afba6ac22482a7

    SHA256

    bbc1e7d208cdc7a998588a662623f065fd52f32b16fec963c89ea02d9227d03c

    SHA512

    8af5c5c196ab65461b8d92b1ae7faaaff62a404a456af9c782cf90b470aea94d8b58ad9fe85f4cb1011f9884fec17577dd702944695f4462ecd53faf180fa4d0

  • C:\Users\Admin\AppData\Local\Temp\is-FHT33.tmp\_iscrypt.dll

    Filesize

    2KB

    MD5

    a69559718ab506675e907fe49deb71e9

    SHA1

    bc8f404ffdb1960b50c12ff9413c893b56f2e36f

    SHA256

    2f6294f9aa09f59a574b5dcd33be54e16b39377984f3d5658cda44950fa0f8fc

    SHA512

    e52e0aa7fe3f79e36330c455d944653d449ba05b2f9abee0914a0910c3452cfa679a40441f9ac696b3ccf9445cbb85095747e86153402fc362bb30ac08249a63

  • C:\Users\Admin\AppData\Local\Temp\is-QB85N.tmp\is-5N9AN.tmp

    Filesize

    688KB

    MD5

    807603f3a565337ee2ac3e819b25ee58

    SHA1

    5cc4e6c82fbdda6697a1117561f23731d51baacd

    SHA256

    682dd0a4ea6b0d763a1adb14def8657518a4879e454c7ece43505910dd448423

    SHA512

    252831b5fe5869c0abd25f246fe161e5b8218e9c54231fa9c5c78d5ffe6ff0c8e3d1f9ea3316f74b47ce372f1f8f06edd8e147711633f4028acd0cf7d5cd946d

  • C:\Users\Admin\AppData\Local\Temp\is-QB85N.tmp\is-5N9AN.tmp

    Filesize

    688KB

    MD5

    807603f3a565337ee2ac3e819b25ee58

    SHA1

    5cc4e6c82fbdda6697a1117561f23731d51baacd

    SHA256

    682dd0a4ea6b0d763a1adb14def8657518a4879e454c7ece43505910dd448423

    SHA512

    252831b5fe5869c0abd25f246fe161e5b8218e9c54231fa9c5c78d5ffe6ff0c8e3d1f9ea3316f74b47ce372f1f8f06edd8e147711633f4028acd0cf7d5cd946d

  • C:\Users\Admin\AppData\Roaming\{6cebb340-6208-11ed-bf50-806e6f6e6963}\N4ZzEMeML.exe

    Filesize

    72KB

    MD5

    3fb36cb0b7172e5298d2992d42984d06

    SHA1

    439827777df4a337cbb9fa4a4640d0d3fa1738b7

    SHA256

    27ae813ceff8aa56e9fa68c8e50bb1c6c4a01636015eac4bd8bf444afb7020d6

    SHA512

    6b39cb32d77200209a25080ac92bc71b1f468e2946b651023793f3585ee6034adc70924dbd751cf4a51b5e71377854f1ab43c2dd287d4837e7b544ff886f470c

  • C:\Users\Admin\AppData\Roaming\{6cebb340-6208-11ed-bf50-806e6f6e6963}\N4ZzEMeML.exe

    Filesize

    72KB

    MD5

    3fb36cb0b7172e5298d2992d42984d06

    SHA1

    439827777df4a337cbb9fa4a4640d0d3fa1738b7

    SHA256

    27ae813ceff8aa56e9fa68c8e50bb1c6c4a01636015eac4bd8bf444afb7020d6

    SHA512

    6b39cb32d77200209a25080ac92bc71b1f468e2946b651023793f3585ee6034adc70924dbd751cf4a51b5e71377854f1ab43c2dd287d4837e7b544ff886f470c

  • memory/1140-143-0x0000000000400000-0x000000000151A000-memory.dmp

    Filesize

    17.1MB

  • memory/1140-142-0x0000000000400000-0x000000000151A000-memory.dmp

    Filesize

    17.1MB

  • memory/1140-147-0x0000000010000000-0x000000001001B000-memory.dmp

    Filesize

    108KB

  • memory/1140-152-0x0000000000400000-0x000000000151A000-memory.dmp

    Filesize

    17.1MB

  • memory/1140-155-0x0000000000400000-0x000000000151A000-memory.dmp

    Filesize

    17.1MB

  • memory/2420-132-0x0000000000400000-0x000000000041E000-memory.dmp

    Filesize

    120KB

  • memory/2420-134-0x0000000000400000-0x000000000041E000-memory.dmp

    Filesize

    120KB

  • memory/2420-151-0x0000000000400000-0x000000000041E000-memory.dmp

    Filesize

    120KB

  • memory/2420-156-0x0000000000400000-0x000000000041E000-memory.dmp

    Filesize

    120KB