Analysis

  • max time kernel
    92s
  • max time network
    150s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20220812-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20220812-enlocale:en-usos:windows10-2004-x64system
  • submitted
    28/12/2022, 23:18

General

  • Target

    7a9e33c5307748d5eda1d300f55a0d5efa045edce88bf6d4e2806393f65580b8.exe

  • Size

    2.1MB

  • MD5

    c9047d22ee6551b3d663d7084f3d1ed1

  • SHA1

    b9c1320eff08005e55334ad374260d8cd3d787ca

  • SHA256

    7a9e33c5307748d5eda1d300f55a0d5efa045edce88bf6d4e2806393f65580b8

  • SHA512

    504157f7f4d0d5fbc029a491f87a49f24c3c5f45ce7fb32ecb8fce5451912c84b06cb47f3ed0741148b0df6a362c2828dbf7fb948cc5f94622f10f74c9b49c3d

  • SSDEEP

    49152:2ivLILyzK1IFS97Cyy1W1YPYkakGsbvjCYef0C6sBCu319UDXKY:2iv8pK8eyy1ZPZakXyOs0

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\7a9e33c5307748d5eda1d300f55a0d5efa045edce88bf6d4e2806393f65580b8.exe
    "C:\Users\Admin\AppData\Local\Temp\7a9e33c5307748d5eda1d300f55a0d5efa045edce88bf6d4e2806393f65580b8.exe"
    1⤵
    • Suspicious use of WriteProcessMemory
    PID:1932
    • C:\Users\Admin\AppData\Local\Temp\is-TDBU2.tmp\is-4IQFU.tmp
      "C:\Users\Admin\AppData\Local\Temp\is-TDBU2.tmp\is-4IQFU.tmp" /SL4 $9006C "C:\Users\Admin\AppData\Local\Temp\7a9e33c5307748d5eda1d300f55a0d5efa045edce88bf6d4e2806393f65580b8.exe" 1837330 217600
      2⤵
      • Executes dropped EXE
      • Loads dropped DLL
      • Drops file in Program Files directory
      • Suspicious use of WriteProcessMemory
      PID:5068
      • 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:4912
        • C:\Users\Admin\AppData\Roaming\{99cae5c0-1ab4-11ed-899c-806e6f6e6963}\4MEfE6KBD7red.exe
          4⤵
          • Executes dropped EXE
          PID:4472
        • 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:2596
          • C:\Windows\SysWOW64\taskkill.exe
            taskkill /im "SplitFiles123.exe" /f
            5⤵
            • Kills process with taskkill
            • Suspicious use of AdjustPrivilegeToken
            PID:4408

Network

MITRE ATT&CK Enterprise v6

Replay Monitor

Loading Replay Monitor...

Downloads

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

    Filesize

    3.2MB

    MD5

    ed6b7e901e1bb5d2f621de3302069796

    SHA1

    c9ef00f91c1b3d1115f3258a9367b1b578594289

    SHA256

    cfca78bd05c37a53f833dbce3f17313d813b3986e56265f37ce1c2a5f175d878

    SHA512

    fd3fc1db8e3e1ceb7bf8a4c7de26cd3dc880543735f8a591248f6a2a608f2dccb67c858cec8a973aecd96355d0d37ee646bac592106066471ee90f7729eea91e

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

    Filesize

    3.2MB

    MD5

    ed6b7e901e1bb5d2f621de3302069796

    SHA1

    c9ef00f91c1b3d1115f3258a9367b1b578594289

    SHA256

    cfca78bd05c37a53f833dbce3f17313d813b3986e56265f37ce1c2a5f175d878

    SHA512

    fd3fc1db8e3e1ceb7bf8a4c7de26cd3dc880543735f8a591248f6a2a608f2dccb67c858cec8a973aecd96355d0d37ee646bac592106066471ee90f7729eea91e

  • C:\Users\Admin\AppData\Local\Temp\is-61CO9.tmp\_iscrypt.dll

    Filesize

    2KB

    MD5

    a69559718ab506675e907fe49deb71e9

    SHA1

    bc8f404ffdb1960b50c12ff9413c893b56f2e36f

    SHA256

    2f6294f9aa09f59a574b5dcd33be54e16b39377984f3d5658cda44950fa0f8fc

    SHA512

    e52e0aa7fe3f79e36330c455d944653d449ba05b2f9abee0914a0910c3452cfa679a40441f9ac696b3ccf9445cbb85095747e86153402fc362bb30ac08249a63

  • C:\Users\Admin\AppData\Local\Temp\is-TDBU2.tmp\is-4IQFU.tmp

    Filesize

    806KB

    MD5

    4f3db9263ab998737f14cfb0cc7da686

    SHA1

    1f3947a6b5c900f28a93abb7a097aea5efa76f58

    SHA256

    f8ce6681396db8b8a95cdf7dbf02b68c847922aeacd0277a52a4e5ca399f87aa

    SHA512

    60d5207b7af2dadf63aeb6123ed466e779cc9b04ca15f303416b348b8e5ee9c147ee578d5e586df749d1facf460c84090436a0d4944fdebd334373f0f6c18f8d

  • C:\Users\Admin\AppData\Local\Temp\is-TDBU2.tmp\is-4IQFU.tmp

    Filesize

    806KB

    MD5

    4f3db9263ab998737f14cfb0cc7da686

    SHA1

    1f3947a6b5c900f28a93abb7a097aea5efa76f58

    SHA256

    f8ce6681396db8b8a95cdf7dbf02b68c847922aeacd0277a52a4e5ca399f87aa

    SHA512

    60d5207b7af2dadf63aeb6123ed466e779cc9b04ca15f303416b348b8e5ee9c147ee578d5e586df749d1facf460c84090436a0d4944fdebd334373f0f6c18f8d

  • C:\Users\Admin\AppData\Roaming\{99cae5c0-1ab4-11ed-899c-806e6f6e6963}\4MEfE6KBD7red.exe

    Filesize

    72KB

    MD5

    3fb36cb0b7172e5298d2992d42984d06

    SHA1

    439827777df4a337cbb9fa4a4640d0d3fa1738b7

    SHA256

    27ae813ceff8aa56e9fa68c8e50bb1c6c4a01636015eac4bd8bf444afb7020d6

    SHA512

    6b39cb32d77200209a25080ac92bc71b1f468e2946b651023793f3585ee6034adc70924dbd751cf4a51b5e71377854f1ab43c2dd287d4837e7b544ff886f470c

  • C:\Users\Admin\AppData\Roaming\{99cae5c0-1ab4-11ed-899c-806e6f6e6963}\4MEfE6KBD7red.exe

    Filesize

    72KB

    MD5

    3fb36cb0b7172e5298d2992d42984d06

    SHA1

    439827777df4a337cbb9fa4a4640d0d3fa1738b7

    SHA256

    27ae813ceff8aa56e9fa68c8e50bb1c6c4a01636015eac4bd8bf444afb7020d6

    SHA512

    6b39cb32d77200209a25080ac92bc71b1f468e2946b651023793f3585ee6034adc70924dbd751cf4a51b5e71377854f1ab43c2dd287d4837e7b544ff886f470c

  • memory/1932-132-0x0000000000400000-0x000000000043B000-memory.dmp

    Filesize

    236KB

  • memory/1932-156-0x0000000000400000-0x000000000043B000-memory.dmp

    Filesize

    236KB

  • memory/1932-138-0x0000000000400000-0x000000000043B000-memory.dmp

    Filesize

    236KB

  • memory/4912-143-0x0000000000400000-0x0000000001538000-memory.dmp

    Filesize

    17.2MB

  • memory/4912-144-0x0000000000400000-0x0000000001538000-memory.dmp

    Filesize

    17.2MB

  • memory/4912-148-0x0000000010000000-0x000000001001B000-memory.dmp

    Filesize

    108KB

  • memory/4912-152-0x0000000000400000-0x0000000001538000-memory.dmp

    Filesize

    17.2MB

  • memory/4912-142-0x0000000000400000-0x0000000001538000-memory.dmp

    Filesize

    17.2MB

  • memory/4912-155-0x0000000000400000-0x0000000001538000-memory.dmp

    Filesize

    17.2MB