Analysis

  • max time kernel
    61s
  • max time network
    148s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20220812-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20220812-enlocale:en-usos:windows10-2004-x64system
  • submitted
    29/12/2022, 03:01

General

  • Target

    file.exe

  • Size

    1.7MB

  • MD5

    7259a7741234e85560130ffb945bb2c8

  • SHA1

    74841b32e49e5cc8bf59791fe81869b991066d62

  • SHA256

    1aa3ec37c3a65c614d8e5d4ed78db075dc1deb0960aaece81baab114cde36ed7

  • SHA512

    4328cec55a9b30614204d99f816b92d20083eb223e5c5996042704973791fd0bed7396d13ccc1c318975f7ba1b53d388ad428f958a3dd8e37ebeecb7dbb084d2

  • SSDEEP

    24576:Wpnif9g2szGrcc0Mwkwi+ibTOtDnQIDDxCzKUYYkRpWhn7uhqhfY9jSHOHJ6rfBI:8if5szmckkim3DBUnZvoQrteON2

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:716
    • C:\Users\Admin\AppData\Local\Temp\is-P1IBU.tmp\is-4ES66.tmp
      "C:\Users\Admin\AppData\Local\Temp\is-P1IBU.tmp\is-4ES66.tmp" /SL4 $501EC "C:\Users\Admin\AppData\Local\Temp\file.exe" 1582727 96768
      2⤵
      • Executes dropped EXE
      • Loads dropped DLL
      • Drops file in Program Files directory
      • Suspicious use of WriteProcessMemory
      PID:5100
      • C:\Program Files (x86)\Split Files\SplitFiles123.exe
        "C:\Program Files (x86)\Split Files\SplitFiles123.exe"
        3⤵
        • Executes dropped EXE
        • Checks computer location settings
        • Suspicious behavior: EnumeratesProcesses
        • Suspicious use of WriteProcessMemory
        PID:2556
        • C:\Users\Admin\AppData\Roaming\{cd0d74c0-1ab4-11ed-b686-806e6f6e6963}\VYeiVoDNyxj.exe
          4⤵
          • Executes dropped EXE
          PID:384
        • C:\Windows\SysWOW64\cmd.exe
          "C:\Windows\System32\cmd.exe" /c taskkill /im "SplitFiles123.exe" /f & erase "C:\Program Files (x86)\Split Files\SplitFiles123.exe" & exit
          4⤵
          • Suspicious use of WriteProcessMemory
          PID:1428
          • C:\Windows\SysWOW64\taskkill.exe
            taskkill /im "SplitFiles123.exe" /f
            5⤵
            • Kills process with taskkill
            • Suspicious use of AdjustPrivilegeToken
            PID:1964

Network

MITRE ATT&CK Enterprise v6

Replay Monitor

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Downloads

  • C:\Program Files (x86)\Split Files\SplitFiles123.exe

    Filesize

    3.1MB

    MD5

    70a6c9f69b93a2ec88fbf2e9ac4b6227

    SHA1

    7ca07d45ffc70792403390b0b34811d072decbfd

    SHA256

    b8d292eb95a313d413656731e928b0d88a6ed59c05b8a339e992fdd898d39f20

    SHA512

    70b0f45601862a53684875aedf3f5d2e58ee00a63cd49782764a59c6ef9bd8157246c7f68608584f5430b927c6b845e3c02ba130b70bbc4b3c677f7d5625849c

  • C:\Program Files (x86)\Split Files\SplitFiles123.exe

    Filesize

    3.1MB

    MD5

    70a6c9f69b93a2ec88fbf2e9ac4b6227

    SHA1

    7ca07d45ffc70792403390b0b34811d072decbfd

    SHA256

    b8d292eb95a313d413656731e928b0d88a6ed59c05b8a339e992fdd898d39f20

    SHA512

    70b0f45601862a53684875aedf3f5d2e58ee00a63cd49782764a59c6ef9bd8157246c7f68608584f5430b927c6b845e3c02ba130b70bbc4b3c677f7d5625849c

  • C:\Users\Admin\AppData\Local\Temp\is-FRN1N.tmp\_iscrypt.dll

    Filesize

    2KB

    MD5

    a69559718ab506675e907fe49deb71e9

    SHA1

    bc8f404ffdb1960b50c12ff9413c893b56f2e36f

    SHA256

    2f6294f9aa09f59a574b5dcd33be54e16b39377984f3d5658cda44950fa0f8fc

    SHA512

    e52e0aa7fe3f79e36330c455d944653d449ba05b2f9abee0914a0910c3452cfa679a40441f9ac696b3ccf9445cbb85095747e86153402fc362bb30ac08249a63

  • C:\Users\Admin\AppData\Local\Temp\is-P1IBU.tmp\is-4ES66.tmp

    Filesize

    688KB

    MD5

    807603f3a565337ee2ac3e819b25ee58

    SHA1

    5cc4e6c82fbdda6697a1117561f23731d51baacd

    SHA256

    682dd0a4ea6b0d763a1adb14def8657518a4879e454c7ece43505910dd448423

    SHA512

    252831b5fe5869c0abd25f246fe161e5b8218e9c54231fa9c5c78d5ffe6ff0c8e3d1f9ea3316f74b47ce372f1f8f06edd8e147711633f4028acd0cf7d5cd946d

  • C:\Users\Admin\AppData\Local\Temp\is-P1IBU.tmp\is-4ES66.tmp

    Filesize

    688KB

    MD5

    807603f3a565337ee2ac3e819b25ee58

    SHA1

    5cc4e6c82fbdda6697a1117561f23731d51baacd

    SHA256

    682dd0a4ea6b0d763a1adb14def8657518a4879e454c7ece43505910dd448423

    SHA512

    252831b5fe5869c0abd25f246fe161e5b8218e9c54231fa9c5c78d5ffe6ff0c8e3d1f9ea3316f74b47ce372f1f8f06edd8e147711633f4028acd0cf7d5cd946d

  • C:\Users\Admin\AppData\Roaming\{cd0d74c0-1ab4-11ed-b686-806e6f6e6963}\VYeiVoDNyxj.exe

    Filesize

    72KB

    MD5

    3fb36cb0b7172e5298d2992d42984d06

    SHA1

    439827777df4a337cbb9fa4a4640d0d3fa1738b7

    SHA256

    27ae813ceff8aa56e9fa68c8e50bb1c6c4a01636015eac4bd8bf444afb7020d6

    SHA512

    6b39cb32d77200209a25080ac92bc71b1f468e2946b651023793f3585ee6034adc70924dbd751cf4a51b5e71377854f1ab43c2dd287d4837e7b544ff886f470c

  • C:\Users\Admin\AppData\Roaming\{cd0d74c0-1ab4-11ed-b686-806e6f6e6963}\VYeiVoDNyxj.exe

    Filesize

    72KB

    MD5

    3fb36cb0b7172e5298d2992d42984d06

    SHA1

    439827777df4a337cbb9fa4a4640d0d3fa1738b7

    SHA256

    27ae813ceff8aa56e9fa68c8e50bb1c6c4a01636015eac4bd8bf444afb7020d6

    SHA512

    6b39cb32d77200209a25080ac92bc71b1f468e2946b651023793f3585ee6034adc70924dbd751cf4a51b5e71377854f1ab43c2dd287d4837e7b544ff886f470c

  • memory/716-155-0x0000000000400000-0x000000000041E000-memory.dmp

    Filesize

    120KB

  • memory/716-138-0x0000000000400000-0x000000000041E000-memory.dmp

    Filesize

    120KB

  • memory/716-132-0x0000000000400000-0x000000000041E000-memory.dmp

    Filesize

    120KB

  • memory/2556-143-0x0000000000400000-0x000000000151A000-memory.dmp

    Filesize

    17.1MB

  • memory/2556-147-0x0000000010000000-0x000000001001B000-memory.dmp

    Filesize

    108KB

  • memory/2556-151-0x0000000000400000-0x000000000151A000-memory.dmp

    Filesize

    17.1MB

  • memory/2556-142-0x0000000000400000-0x000000000151A000-memory.dmp

    Filesize

    17.1MB

  • memory/2556-154-0x0000000000400000-0x000000000151A000-memory.dmp

    Filesize

    17.1MB