Analysis

  • max time kernel
    90s
  • max time network
    151s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20220901-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20220901-enlocale:en-usos:windows10-2004-x64system
  • submitted
    18/11/2022, 21:17

General

  • Target

    file.exe

  • Size

    2.0MB

  • MD5

    c58a8b8046d31d2764e43b218f5d8e88

  • SHA1

    3a2ce27c4c56f48b3801e4eea1c83569f4e80794

  • SHA256

    17d5d1a251f21d63f42d012d088645054cef60fb8ebed67ec75c1fa318dd3570

  • SHA512

    56f7a0d3dda7a3795c1ebcb5c9550e30c9cb45d364c40dd9491c1987a0e9181acb089830746de0b9e4b13f2cc7500580f3fc07d7632f26f422b096f4f2d18098

  • SSDEEP

    49152:q2rpVn9bqV2/WaAha6oTXCEE7dsW70fxj0mRhk0jAyHfRx7Pq2:rd3k/aAha6USEE7dV70fxjDaahPD

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 12 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:4348
    • C:\Users\Admin\AppData\Local\Temp\is-O67II.tmp\is-D1O12.tmp
      "C:\Users\Admin\AppData\Local\Temp\is-O67II.tmp\is-D1O12.tmp" /SL4 $8006A "C:\Users\Admin\AppData\Local\Temp\file.exe" 1806416 54784
      2⤵
      • Executes dropped EXE
      • Loads dropped DLL
      • Drops file in Program Files directory
      • Suspicious use of WriteProcessMemory
      PID:3412
      • C:\Program Files (x86)\grSearcher\grsearcher83.exe
        "C:\Program Files (x86)\grSearcher\grsearcher83.exe"
        3⤵
        • Executes dropped EXE
        • Checks computer location settings
        • Suspicious behavior: EnumeratesProcesses
        • Suspicious use of WriteProcessMemory
        PID:1516
        • C:\Users\Admin\AppData\Roaming\{d6dc608d-2a27-11ed-a0e3-806e6f6e6963}\buYdpxBMNFTvlm.exe
          4⤵
          • Executes dropped EXE
          PID:2980
        • C:\Windows\SysWOW64\cmd.exe
          "C:\Windows\System32\cmd.exe" /c taskkill /im "grsearcher83.exe" /f & erase "C:\Program Files (x86)\grSearcher\grsearcher83.exe" & exit
          4⤵
          • Suspicious use of WriteProcessMemory
          PID:4976
          • C:\Windows\SysWOW64\taskkill.exe
            taskkill /im "grsearcher83.exe" /f
            5⤵
            • Kills process with taskkill
            • Suspicious use of AdjustPrivilegeToken
            PID:4476

Network

        MITRE ATT&CK Enterprise v6

        Replay Monitor

        Loading Replay Monitor...

        Downloads

        • C:\Program Files (x86)\grSearcher\grsearcher83.exe

          Filesize

          2.8MB

          MD5

          3d23a7d279cbbafd129ec79bc3592859

          SHA1

          f5692daa3ee7a80b22015ad0a0acc2cc64a9b11c

          SHA256

          76adc6896224a61f3bfaa1ae3edee277886138e9e24facf485426b5424708c54

          SHA512

          67112c0be30c34c7b90d9b21af9c8bf88b04b29eeefaab3a018bdb802d29ed08e1a3700604e51cee7867b69faf8eb1de4788dfa6b4da8b2a2cbd262983febd14

        • C:\Program Files (x86)\grSearcher\grsearcher83.exe

          Filesize

          2.8MB

          MD5

          3d23a7d279cbbafd129ec79bc3592859

          SHA1

          f5692daa3ee7a80b22015ad0a0acc2cc64a9b11c

          SHA256

          76adc6896224a61f3bfaa1ae3edee277886138e9e24facf485426b5424708c54

          SHA512

          67112c0be30c34c7b90d9b21af9c8bf88b04b29eeefaab3a018bdb802d29ed08e1a3700604e51cee7867b69faf8eb1de4788dfa6b4da8b2a2cbd262983febd14

        • C:\Users\Admin\AppData\Local\Temp\is-0M04O.tmp\_isetup\_iscrypt.dll

          Filesize

          2KB

          MD5

          a69559718ab506675e907fe49deb71e9

          SHA1

          bc8f404ffdb1960b50c12ff9413c893b56f2e36f

          SHA256

          2f6294f9aa09f59a574b5dcd33be54e16b39377984f3d5658cda44950fa0f8fc

          SHA512

          e52e0aa7fe3f79e36330c455d944653d449ba05b2f9abee0914a0910c3452cfa679a40441f9ac696b3ccf9445cbb85095747e86153402fc362bb30ac08249a63

        • C:\Users\Admin\AppData\Local\Temp\is-O67II.tmp\is-D1O12.tmp

          Filesize

          659KB

          MD5

          34a3efb47055787f7a4537fb08fb93ec

          SHA1

          7396195a1bc60f31bb90b5c8abf4b4ce95ec06f9

          SHA256

          fe0505386751f6c7a49d4b3594cc99c8936a9906e49c595934e586f0b9a9e409

          SHA512

          055b18c604aa583f0150f39e564438e15cd07dff308212a2c508978e2347224e2c7979f5066fb4f4e9073d5a76ee845d659214cd5f8669ce808e74d0078520ff

        • C:\Users\Admin\AppData\Local\Temp\is-O67II.tmp\is-D1O12.tmp

          Filesize

          659KB

          MD5

          34a3efb47055787f7a4537fb08fb93ec

          SHA1

          7396195a1bc60f31bb90b5c8abf4b4ce95ec06f9

          SHA256

          fe0505386751f6c7a49d4b3594cc99c8936a9906e49c595934e586f0b9a9e409

          SHA512

          055b18c604aa583f0150f39e564438e15cd07dff308212a2c508978e2347224e2c7979f5066fb4f4e9073d5a76ee845d659214cd5f8669ce808e74d0078520ff

        • C:\Users\Admin\AppData\Roaming\{d6dc608d-2a27-11ed-a0e3-806e6f6e6963}\buYdpxBMNFTvlm.exe

          Filesize

          72KB

          MD5

          3fb36cb0b7172e5298d2992d42984d06

          SHA1

          439827777df4a337cbb9fa4a4640d0d3fa1738b7

          SHA256

          27ae813ceff8aa56e9fa68c8e50bb1c6c4a01636015eac4bd8bf444afb7020d6

          SHA512

          6b39cb32d77200209a25080ac92bc71b1f468e2946b651023793f3585ee6034adc70924dbd751cf4a51b5e71377854f1ab43c2dd287d4837e7b544ff886f470c

        • C:\Users\Admin\AppData\Roaming\{d6dc608d-2a27-11ed-a0e3-806e6f6e6963}\buYdpxBMNFTvlm.exe

          Filesize

          72KB

          MD5

          3fb36cb0b7172e5298d2992d42984d06

          SHA1

          439827777df4a337cbb9fa4a4640d0d3fa1738b7

          SHA256

          27ae813ceff8aa56e9fa68c8e50bb1c6c4a01636015eac4bd8bf444afb7020d6

          SHA512

          6b39cb32d77200209a25080ac92bc71b1f468e2946b651023793f3585ee6034adc70924dbd751cf4a51b5e71377854f1ab43c2dd287d4837e7b544ff886f470c

        • memory/1516-143-0x0000000000400000-0x00000000014C8000-memory.dmp

          Filesize

          16.8MB

        • memory/1516-148-0x0000000010000000-0x000000001001B000-memory.dmp

          Filesize

          108KB

        • memory/1516-142-0x0000000000400000-0x00000000014C8000-memory.dmp

          Filesize

          16.8MB

        • memory/1516-155-0x0000000000400000-0x00000000014C8000-memory.dmp

          Filesize

          16.8MB

        • memory/1516-144-0x0000000000400000-0x00000000014C8000-memory.dmp

          Filesize

          16.8MB

        • memory/1516-152-0x0000000000400000-0x00000000014C8000-memory.dmp

          Filesize

          16.8MB

        • memory/4348-137-0x0000000000400000-0x0000000000414000-memory.dmp

          Filesize

          80KB

        • memory/4348-132-0x0000000000400000-0x0000000000414000-memory.dmp

          Filesize

          80KB

        • memory/4348-156-0x0000000000400000-0x0000000000414000-memory.dmp

          Filesize

          80KB