Analysis

  • max time kernel
    91s
  • max time network
    151s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20221111-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20221111-enlocale:en-usos:windows10-2004-x64system
  • submitted
    10-01-2023 04:32

General

  • Target

    file.exe

  • Size

    1.2MB

  • MD5

    f5cb54d4dbfcd2181d202434ec003fc0

  • SHA1

    0d13b055d3bfff7bc581b7accc5c5280dd2428a7

  • SHA256

    6fda8bc575c28283d7df4e0460ae818a554a8dc086ec47b3f2f0283b798d54aa

  • SHA512

    1802d54567828d6eb04ed3d916413e0725d88c1f4d0f0a593c9548f3e249430955468be7b03c69b6b52e34f7f5c893c2b69aedd0dd04232227e72705d1744022

  • SSDEEP

    24576:R20+CSEpFqThtDnnoBeYQz/HoAc9G1RONT0YvyrSkl5l/Hld:R2KSEcxnnoIYK1i0YvOl5V

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:1620
    • C:\Users\Admin\AppData\Local\Temp\is-ASLTS.tmp\file.tmp
      "C:\Users\Admin\AppData\Local\Temp\is-ASLTS.tmp\file.tmp" /SL5="$80066,1038436,51712,C:\Users\Admin\AppData\Local\Temp\file.exe"
      2⤵
      • Executes dropped EXE
      • Loads dropped DLL
      • Drops file in Program Files directory
      • Suspicious use of WriteProcessMemory
      PID:4552
      • C:\Program Files (x86)\Split Files\KitFiles136.exe
        "C:\Program Files (x86)\Split Files\KitFiles136.exe"
        3⤵
        • Executes dropped EXE
        • Checks computer location settings
        • Suspicious behavior: EnumeratesProcesses
        • Suspicious use of WriteProcessMemory
        PID:1260
        • C:\Users\Admin\AppData\Roaming\{6eb576c0-6208-11ed-9190-806e6f6e6963}\hRJeZxXxS.exe
          4⤵
          • Executes dropped EXE
          PID:5028
        • C:\Windows\SysWOW64\cmd.exe
          "C:\Windows\System32\cmd.exe" /c taskkill /im "KitFiles136.exe" /f & erase "C:\Program Files (x86)\Split Files\KitFiles136.exe" & exit
          4⤵
          • Suspicious use of WriteProcessMemory
          PID:4376
          • C:\Windows\SysWOW64\taskkill.exe
            taskkill /im "KitFiles136.exe" /f
            5⤵
            • Kills process with taskkill
            • Suspicious use of AdjustPrivilegeToken
            PID:2352

Network

MITRE ATT&CK Enterprise v6

Replay Monitor

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Downloads

  • C:\Program Files (x86)\Split Files\KitFiles136.exe

    Filesize

    1.8MB

    MD5

    bbe7332e6039fc8a3fd05cc59162f5e6

    SHA1

    73450857c2ac1492b74806f04ba5c84d7ab76355

    SHA256

    de842bd5071e299deb10784348c7e914924ab3aa0e0633b304b722e3412c6ca0

    SHA512

    269730ece0b8450daa9415e1d146bae41cc0e07737b8947257b1c48ab97291aa174e4509f623fd2d7f4b757cd5b7db7ae9f4c0c6af7169eb3920471c12c86f15

  • C:\Program Files (x86)\Split Files\KitFiles136.exe

    Filesize

    1.8MB

    MD5

    bbe7332e6039fc8a3fd05cc59162f5e6

    SHA1

    73450857c2ac1492b74806f04ba5c84d7ab76355

    SHA256

    de842bd5071e299deb10784348c7e914924ab3aa0e0633b304b722e3412c6ca0

    SHA512

    269730ece0b8450daa9415e1d146bae41cc0e07737b8947257b1c48ab97291aa174e4509f623fd2d7f4b757cd5b7db7ae9f4c0c6af7169eb3920471c12c86f15

  • C:\Users\Admin\AppData\Local\Temp\is-3AAC1.tmp\_isetup\_iscrypt.dll

    Filesize

    2KB

    MD5

    a69559718ab506675e907fe49deb71e9

    SHA1

    bc8f404ffdb1960b50c12ff9413c893b56f2e36f

    SHA256

    2f6294f9aa09f59a574b5dcd33be54e16b39377984f3d5658cda44950fa0f8fc

    SHA512

    e52e0aa7fe3f79e36330c455d944653d449ba05b2f9abee0914a0910c3452cfa679a40441f9ac696b3ccf9445cbb85095747e86153402fc362bb30ac08249a63

  • C:\Users\Admin\AppData\Local\Temp\is-ASLTS.tmp\file.tmp

    Filesize

    692KB

    MD5

    011df348d33aeb3103be711e7aaad000

    SHA1

    eff06d4777d24ab7c2384737b846b7df7c9dd5ae

    SHA256

    4f50389dd834b3268fcc673f791d82a61142eeb7baaa54a03668516df18507ef

    SHA512

    e4b76ac1058880a8ba633f0ff37657594a92231cc6093b80dc6c3617d3edd045f1a3592c2b04cf5acbdbb599d2e4b9e079a47e92692912f4f0d7d189dd14b375

  • C:\Users\Admin\AppData\Local\Temp\is-ASLTS.tmp\file.tmp

    Filesize

    692KB

    MD5

    011df348d33aeb3103be711e7aaad000

    SHA1

    eff06d4777d24ab7c2384737b846b7df7c9dd5ae

    SHA256

    4f50389dd834b3268fcc673f791d82a61142eeb7baaa54a03668516df18507ef

    SHA512

    e4b76ac1058880a8ba633f0ff37657594a92231cc6093b80dc6c3617d3edd045f1a3592c2b04cf5acbdbb599d2e4b9e079a47e92692912f4f0d7d189dd14b375

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

    Filesize

    72KB

    MD5

    3fb36cb0b7172e5298d2992d42984d06

    SHA1

    439827777df4a337cbb9fa4a4640d0d3fa1738b7

    SHA256

    27ae813ceff8aa56e9fa68c8e50bb1c6c4a01636015eac4bd8bf444afb7020d6

    SHA512

    6b39cb32d77200209a25080ac92bc71b1f468e2946b651023793f3585ee6034adc70924dbd751cf4a51b5e71377854f1ab43c2dd287d4837e7b544ff886f470c

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

    Filesize

    72KB

    MD5

    3fb36cb0b7172e5298d2992d42984d06

    SHA1

    439827777df4a337cbb9fa4a4640d0d3fa1738b7

    SHA256

    27ae813ceff8aa56e9fa68c8e50bb1c6c4a01636015eac4bd8bf444afb7020d6

    SHA512

    6b39cb32d77200209a25080ac92bc71b1f468e2946b651023793f3585ee6034adc70924dbd751cf4a51b5e71377854f1ab43c2dd287d4837e7b544ff886f470c

  • memory/1260-143-0x0000000000400000-0x00000000013CD000-memory.dmp

    Filesize

    15.8MB

  • memory/1260-147-0x0000000010000000-0x000000001001B000-memory.dmp

    Filesize

    108KB

  • memory/1260-141-0x0000000000400000-0x00000000013CD000-memory.dmp

    Filesize

    15.8MB

  • memory/1260-155-0x0000000000400000-0x00000000013CD000-memory.dmp

    Filesize

    15.8MB

  • memory/1260-138-0x0000000000000000-mapping.dmp

  • memory/1260-152-0x0000000000400000-0x00000000013CD000-memory.dmp

    Filesize

    15.8MB

  • memory/1260-142-0x0000000000400000-0x00000000013CD000-memory.dmp

    Filesize

    15.8MB

  • memory/1620-151-0x0000000000400000-0x0000000000414000-memory.dmp

    Filesize

    80KB

  • memory/1620-132-0x0000000000400000-0x0000000000414000-memory.dmp

    Filesize

    80KB

  • memory/1620-156-0x0000000000400000-0x0000000000414000-memory.dmp

    Filesize

    80KB

  • memory/2352-154-0x0000000000000000-mapping.dmp

  • memory/4376-153-0x0000000000000000-mapping.dmp

  • memory/4552-134-0x0000000000000000-mapping.dmp

  • memory/5028-144-0x0000000000000000-mapping.dmp