Analysis

  • max time kernel
    77s
  • max time network
    145s
  • 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, 12:23

General

  • Target

    aad7787a0a697a883ada1a7e82ca9050.exe

  • Size

    1.9MB

  • MD5

    aad7787a0a697a883ada1a7e82ca9050

  • SHA1

    ad8b712f43a7f9847fcf7a705a8e3274041116fb

  • SHA256

    40d054629a498bc0d0d9f21d241d719da13b6d873aa6ad1dcb7ef95c3170d620

  • SHA512

    27ec87c05933bf0e6ac116c1d9048d8fa0fced4595abba267a5a700565cac4e8c197212cd89633866aeda1d65697f8ef906c9f8f0cd8ea3bfa5b916f4c4e7163

  • SSDEEP

    49152:oivUC1KsdLBlgMn1/oqE1hGzsO/TLu7FlaBSX9SNG:oiM8KslBlJoqEuLcA0B

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\aad7787a0a697a883ada1a7e82ca9050.exe
    "C:\Users\Admin\AppData\Local\Temp\aad7787a0a697a883ada1a7e82ca9050.exe"
    1⤵
    • Suspicious use of WriteProcessMemory
    PID:1712
    • C:\Users\Admin\AppData\Local\Temp\is-FKQNJ.tmp\is-PLVTS.tmp
      "C:\Users\Admin\AppData\Local\Temp\is-FKQNJ.tmp\is-PLVTS.tmp" /SL4 $701CA "C:\Users\Admin\AppData\Local\Temp\aad7787a0a697a883ada1a7e82ca9050.exe" 1781150 96768
      2⤵
      • Executes dropped EXE
      • Loads dropped DLL
      • Drops file in Program Files directory
      • Suspicious use of WriteProcessMemory
      PID:4736
      • 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:4340
        • C:\Users\Admin\AppData\Roaming\{6eb576c0-6208-11ed-9190-806e6f6e6963}\WWCIsnXXe.exe
          4⤵
          • Executes dropped EXE
          PID:2700
        • 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:3596
          • C:\Windows\SysWOW64\taskkill.exe
            taskkill /im "SplitFiles124.exe" /f
            5⤵
            • Kills process with taskkill
            • Suspicious use of AdjustPrivilegeToken
            PID:4152

Network

MITRE ATT&CK Enterprise v6

Replay Monitor

Loading Replay Monitor...

Downloads

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

    Filesize

    3.3MB

    MD5

    06fec979118967cee23ba7b10e41efd5

    SHA1

    ac1e55d9058671eb34af7a3b6bdfdea9b74125f6

    SHA256

    8c2aad572700b50f3b3792b4a1827ed036e68502f02d1230e19cc4d3896a25df

    SHA512

    d7fa49c0e92bdaa430a31ae52cfd384f804f7753a1ec9c52d981ba0bcccae6258563fff3faa03ac1bb849f249d88514d10a75e06c5e98f12cd0264023750db85

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

    Filesize

    3.3MB

    MD5

    06fec979118967cee23ba7b10e41efd5

    SHA1

    ac1e55d9058671eb34af7a3b6bdfdea9b74125f6

    SHA256

    8c2aad572700b50f3b3792b4a1827ed036e68502f02d1230e19cc4d3896a25df

    SHA512

    d7fa49c0e92bdaa430a31ae52cfd384f804f7753a1ec9c52d981ba0bcccae6258563fff3faa03ac1bb849f249d88514d10a75e06c5e98f12cd0264023750db85

  • C:\Users\Admin\AppData\Local\Temp\is-FKQNJ.tmp\is-PLVTS.tmp

    Filesize

    688KB

    MD5

    807603f3a565337ee2ac3e819b25ee58

    SHA1

    5cc4e6c82fbdda6697a1117561f23731d51baacd

    SHA256

    682dd0a4ea6b0d763a1adb14def8657518a4879e454c7ece43505910dd448423

    SHA512

    252831b5fe5869c0abd25f246fe161e5b8218e9c54231fa9c5c78d5ffe6ff0c8e3d1f9ea3316f74b47ce372f1f8f06edd8e147711633f4028acd0cf7d5cd946d

  • C:\Users\Admin\AppData\Local\Temp\is-FKQNJ.tmp\is-PLVTS.tmp

    Filesize

    688KB

    MD5

    807603f3a565337ee2ac3e819b25ee58

    SHA1

    5cc4e6c82fbdda6697a1117561f23731d51baacd

    SHA256

    682dd0a4ea6b0d763a1adb14def8657518a4879e454c7ece43505910dd448423

    SHA512

    252831b5fe5869c0abd25f246fe161e5b8218e9c54231fa9c5c78d5ffe6ff0c8e3d1f9ea3316f74b47ce372f1f8f06edd8e147711633f4028acd0cf7d5cd946d

  • C:\Users\Admin\AppData\Local\Temp\is-MH3HC.tmp\_iscrypt.dll

    Filesize

    2KB

    MD5

    a69559718ab506675e907fe49deb71e9

    SHA1

    bc8f404ffdb1960b50c12ff9413c893b56f2e36f

    SHA256

    2f6294f9aa09f59a574b5dcd33be54e16b39377984f3d5658cda44950fa0f8fc

    SHA512

    e52e0aa7fe3f79e36330c455d944653d449ba05b2f9abee0914a0910c3452cfa679a40441f9ac696b3ccf9445cbb85095747e86153402fc362bb30ac08249a63

  • C:\Users\Admin\AppData\Roaming\{6eb576c0-6208-11ed-9190-806e6f6e6963}\WWCIsnXXe.exe

    Filesize

    72KB

    MD5

    3fb36cb0b7172e5298d2992d42984d06

    SHA1

    439827777df4a337cbb9fa4a4640d0d3fa1738b7

    SHA256

    27ae813ceff8aa56e9fa68c8e50bb1c6c4a01636015eac4bd8bf444afb7020d6

    SHA512

    6b39cb32d77200209a25080ac92bc71b1f468e2946b651023793f3585ee6034adc70924dbd751cf4a51b5e71377854f1ab43c2dd287d4837e7b544ff886f470c

  • C:\Users\Admin\AppData\Roaming\{6eb576c0-6208-11ed-9190-806e6f6e6963}\WWCIsnXXe.exe

    Filesize

    72KB

    MD5

    3fb36cb0b7172e5298d2992d42984d06

    SHA1

    439827777df4a337cbb9fa4a4640d0d3fa1738b7

    SHA256

    27ae813ceff8aa56e9fa68c8e50bb1c6c4a01636015eac4bd8bf444afb7020d6

    SHA512

    6b39cb32d77200209a25080ac92bc71b1f468e2946b651023793f3585ee6034adc70924dbd751cf4a51b5e71377854f1ab43c2dd287d4837e7b544ff886f470c

  • memory/1712-155-0x0000000000400000-0x000000000041E000-memory.dmp

    Filesize

    120KB

  • memory/1712-137-0x0000000000400000-0x000000000041E000-memory.dmp

    Filesize

    120KB

  • memory/1712-132-0x0000000000400000-0x000000000041E000-memory.dmp

    Filesize

    120KB

  • memory/4340-143-0x0000000000400000-0x000000000154C000-memory.dmp

    Filesize

    17.3MB

  • memory/4340-147-0x0000000010000000-0x000000001001B000-memory.dmp

    Filesize

    108KB

  • memory/4340-151-0x0000000000400000-0x000000000154C000-memory.dmp

    Filesize

    17.3MB

  • memory/4340-142-0x0000000000400000-0x000000000154C000-memory.dmp

    Filesize

    17.3MB

  • memory/4340-154-0x0000000000400000-0x000000000154C000-memory.dmp

    Filesize

    17.3MB