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Analysis

  • max time kernel
    106s
  • max time network
    149s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20221111-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20221111-enlocale:en-usos:windows10-2004-x64system
  • submitted
    27/12/2022, 04:33

General

  • Target

    file.exe

  • Size

    1.9MB

  • MD5

    f7c0326793465619ece15ae1f5809fa2

  • SHA1

    3183245da3a06712cfd4beafe39fdde12efe3d5a

  • SHA256

    6502478e95ad00c37bcba9820c2e43d62d7408b583e4f97fdc81f0ca85030873

  • SHA512

    294457f7e86ca5a3448f90e2f94422a7187cc16e4a509cc57320cdc40bca69c9b604771e252a10a74ec12d77f365c9b0f31b2fe444a76f4b9ce7bd4c3c11cab1

  • SSDEEP

    49152:0VqfC8dwexVHEcq3YzKvlTndv6nMkAgvJ4J76aS0qPh:0YfC8dZREK86nMkzEutZ

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:3388
    • C:\Users\Admin\AppData\Local\Temp\is-C8K0M.tmp\is-MOG1S.tmp
      "C:\Users\Admin\AppData\Local\Temp\is-C8K0M.tmp\is-MOG1S.tmp" /SL4 $90040 "C:\Users\Admin\AppData\Local\Temp\file.exe" 1737205 181248
      2⤵
      • Executes dropped EXE
      • Loads dropped DLL
      • Drops file in Program Files directory
      • Suspicious use of WriteProcessMemory
      PID:4416
      • C:\Program Files (x86)\Split Files\SplitFiles122.exe
        "C:\Program Files (x86)\Split Files\SplitFiles122.exe"
        3⤵
        • Executes dropped EXE
        • Checks computer location settings
        • Suspicious behavior: EnumeratesProcesses
        • Suspicious use of WriteProcessMemory
        PID:2864
        • C:\Users\Admin\AppData\Roaming\{6e1ce040-6208-11ed-b5ce-806e6f6e6963}\QaqY9Z7RSSkmCp.exe
          4⤵
          • Executes dropped EXE
          PID:4348
        • C:\Windows\SysWOW64\cmd.exe
          "C:\Windows\System32\cmd.exe" /c taskkill /im "SplitFiles122.exe" /f & erase "C:\Program Files (x86)\Split Files\SplitFiles122.exe" & exit
          4⤵
          • Suspicious use of WriteProcessMemory
          PID:3056
          • C:\Windows\SysWOW64\taskkill.exe
            taskkill /im "SplitFiles122.exe" /f
            5⤵
            • Kills process with taskkill
            • Suspicious use of AdjustPrivilegeToken
            PID:4604

Network

MITRE ATT&CK Enterprise v6

Replay Monitor

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Downloads

  • C:\Program Files (x86)\Split Files\SplitFiles122.exe

    Filesize

    3.2MB

    MD5

    97e6a6a8ed286ae4eac4c0bf8bfabcbf

    SHA1

    7efa7b85b98a24c080346224ad835644108f0c50

    SHA256

    25d8467172c3bfbd25c5b3e3be6b876dd5336941e6280db445fd44f70e8e51cc

    SHA512

    31bf54cbb821114b999f16bc20bf23e7f06ce82e4876ade80278b5d56f801c12d0ee85733c0b095f05906317914b635a5109343354f90a81ac3a88a23c3e3cab

  • C:\Program Files (x86)\Split Files\SplitFiles122.exe

    Filesize

    3.2MB

    MD5

    97e6a6a8ed286ae4eac4c0bf8bfabcbf

    SHA1

    7efa7b85b98a24c080346224ad835644108f0c50

    SHA256

    25d8467172c3bfbd25c5b3e3be6b876dd5336941e6280db445fd44f70e8e51cc

    SHA512

    31bf54cbb821114b999f16bc20bf23e7f06ce82e4876ade80278b5d56f801c12d0ee85733c0b095f05906317914b635a5109343354f90a81ac3a88a23c3e3cab

  • C:\Users\Admin\AppData\Local\Temp\is-C8K0M.tmp\is-MOG1S.tmp

    Filesize

    770KB

    MD5

    a40f6e5d65178feb9ba406771470f1e9

    SHA1

    1e247679ffeffd6908aa2d67e6033fec40fc46d0

    SHA256

    60cd72b4c6b2ce840221b05474286810bed585376a9e0c36fb63ec387284b59e

    SHA512

    dfafa1884102b7ef09c53820e90effea64c1b89fd06eabc0f9d6eca804def9a3798fdd51915d9dc9a632e1d1c2588a7d164e393a4aff72965aeca210673c1386

  • C:\Users\Admin\AppData\Local\Temp\is-C8K0M.tmp\is-MOG1S.tmp

    Filesize

    770KB

    MD5

    a40f6e5d65178feb9ba406771470f1e9

    SHA1

    1e247679ffeffd6908aa2d67e6033fec40fc46d0

    SHA256

    60cd72b4c6b2ce840221b05474286810bed585376a9e0c36fb63ec387284b59e

    SHA512

    dfafa1884102b7ef09c53820e90effea64c1b89fd06eabc0f9d6eca804def9a3798fdd51915d9dc9a632e1d1c2588a7d164e393a4aff72965aeca210673c1386

  • C:\Users\Admin\AppData\Local\Temp\is-LK8J3.tmp\_iscrypt.dll

    Filesize

    2KB

    MD5

    a69559718ab506675e907fe49deb71e9

    SHA1

    bc8f404ffdb1960b50c12ff9413c893b56f2e36f

    SHA256

    2f6294f9aa09f59a574b5dcd33be54e16b39377984f3d5658cda44950fa0f8fc

    SHA512

    e52e0aa7fe3f79e36330c455d944653d449ba05b2f9abee0914a0910c3452cfa679a40441f9ac696b3ccf9445cbb85095747e86153402fc362bb30ac08249a63

  • C:\Users\Admin\AppData\Roaming\{6e1ce040-6208-11ed-b5ce-806e6f6e6963}\QaqY9Z7RSSkmCp.exe

    Filesize

    72KB

    MD5

    3fb36cb0b7172e5298d2992d42984d06

    SHA1

    439827777df4a337cbb9fa4a4640d0d3fa1738b7

    SHA256

    27ae813ceff8aa56e9fa68c8e50bb1c6c4a01636015eac4bd8bf444afb7020d6

    SHA512

    6b39cb32d77200209a25080ac92bc71b1f468e2946b651023793f3585ee6034adc70924dbd751cf4a51b5e71377854f1ab43c2dd287d4837e7b544ff886f470c

  • C:\Users\Admin\AppData\Roaming\{6e1ce040-6208-11ed-b5ce-806e6f6e6963}\QaqY9Z7RSSkmCp.exe

    Filesize

    72KB

    MD5

    3fb36cb0b7172e5298d2992d42984d06

    SHA1

    439827777df4a337cbb9fa4a4640d0d3fa1738b7

    SHA256

    27ae813ceff8aa56e9fa68c8e50bb1c6c4a01636015eac4bd8bf444afb7020d6

    SHA512

    6b39cb32d77200209a25080ac92bc71b1f468e2946b651023793f3585ee6034adc70924dbd751cf4a51b5e71377854f1ab43c2dd287d4837e7b544ff886f470c

  • memory/2864-142-0x0000000000400000-0x000000000152F000-memory.dmp

    Filesize

    17.2MB

  • memory/2864-148-0x0000000010000000-0x000000001001B000-memory.dmp

    Filesize

    108KB

  • memory/2864-143-0x0000000000400000-0x000000000152F000-memory.dmp

    Filesize

    17.2MB

  • memory/2864-155-0x0000000000400000-0x000000000152F000-memory.dmp

    Filesize

    17.2MB

  • memory/2864-144-0x0000000000400000-0x000000000152F000-memory.dmp

    Filesize

    17.2MB

  • memory/2864-152-0x0000000000400000-0x000000000152F000-memory.dmp

    Filesize

    17.2MB

  • memory/3388-137-0x0000000000400000-0x0000000000433000-memory.dmp

    Filesize

    204KB

  • memory/3388-132-0x0000000000400000-0x0000000000433000-memory.dmp

    Filesize

    204KB

  • memory/3388-156-0x0000000000400000-0x0000000000433000-memory.dmp

    Filesize

    204KB