Analysis

  • max time kernel
    91s
  • max time network
    128s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20221111-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20221111-enlocale:en-usos:windows10-2004-x64system
  • submitted
    23/12/2022, 01:01

General

  • Target

    file.exe

  • Size

    1.8MB

  • MD5

    5c1e63f7a1e73dd84950a896ce940743

  • SHA1

    a5f4e981bf7677787e4673d1377e8014c07726c2

  • SHA256

    065dfc499ee4b3749fc69b4c42815d10d8fde9299385a6162b95bee5ed7482ac

  • SHA512

    777d7e1c9a52a7c9163d4c09c0e03bc59be3251aabecd8f7145d2543110ab5d9f4b821d34074dad243c4ee099f6b44769b88a3a94303d39ca61ab9299ba76d6a

  • SSDEEP

    49152:7xK47kiEWSTioN4pWzB27MOGGZ2g6XWP7p3h:7xLkDWSTAs927MLGZ2gMGdh

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:1080
    • C:\Users\Admin\AppData\Local\Temp\is-RUIJT.tmp\is-SAC6D.tmp
      "C:\Users\Admin\AppData\Local\Temp\is-RUIJT.tmp\is-SAC6D.tmp" /SL4 $80030 "C:\Users\Admin\AppData\Local\Temp\file.exe" 1635976 133120
      2⤵
      • Executes dropped EXE
      • Loads dropped DLL
      • Drops file in Program Files directory
      • Suspicious use of WriteProcessMemory
      PID:4016
      • C:\Program Files (x86)\Split Files\SplitFiles117.exe
        "C:\Program Files (x86)\Split Files\SplitFiles117.exe"
        3⤵
        • Executes dropped EXE
        • Checks computer location settings
        • Suspicious behavior: EnumeratesProcesses
        • Suspicious use of WriteProcessMemory
        PID:5112
        • C:\Users\Admin\AppData\Roaming\{6cebb340-6208-11ed-bf50-806e6f6e6963}\2frXjStDTE2hl.exe
          4⤵
          • Executes dropped EXE
          PID:624
        • C:\Windows\SysWOW64\cmd.exe
          "C:\Windows\System32\cmd.exe" /c taskkill /im "SplitFiles117.exe" /f & erase "C:\Program Files (x86)\Split Files\SplitFiles117.exe" & exit
          4⤵
          • Suspicious use of WriteProcessMemory
          PID:5064
          • C:\Windows\SysWOW64\taskkill.exe
            taskkill /im "SplitFiles117.exe" /f
            5⤵
            • Kills process with taskkill
            • Suspicious use of AdjustPrivilegeToken
            PID:4796

Network

        MITRE ATT&CK Enterprise v6

        Replay Monitor

        Loading Replay Monitor...

        Downloads

        • C:\Program Files (x86)\Split Files\SplitFiles117.exe

          Filesize

          3.2MB

          MD5

          732535dafceb8bcdaa14f40f70ae110f

          SHA1

          e6d6e9f96fe75e9ca758c8969ca9bcc29abe1370

          SHA256

          ef24f1baa0c5bb6be981d9d67d429df65be930983ed14e27fbdf2485050a258a

          SHA512

          6574dcd35eabf1a77b42c10bd31f1f54a7acb4ca633f36b99d376eb4daf0f1766f9b5e1b5cf2ab881e5c6ab1d8490cb7b497b2ac33bb76209adc74135ee9b913

        • C:\Program Files (x86)\Split Files\SplitFiles117.exe

          Filesize

          3.2MB

          MD5

          732535dafceb8bcdaa14f40f70ae110f

          SHA1

          e6d6e9f96fe75e9ca758c8969ca9bcc29abe1370

          SHA256

          ef24f1baa0c5bb6be981d9d67d429df65be930983ed14e27fbdf2485050a258a

          SHA512

          6574dcd35eabf1a77b42c10bd31f1f54a7acb4ca633f36b99d376eb4daf0f1766f9b5e1b5cf2ab881e5c6ab1d8490cb7b497b2ac33bb76209adc74135ee9b913

        • C:\Users\Admin\AppData\Local\Temp\is-2QRDM.tmp\_iscrypt.dll

          Filesize

          2KB

          MD5

          a69559718ab506675e907fe49deb71e9

          SHA1

          bc8f404ffdb1960b50c12ff9413c893b56f2e36f

          SHA256

          2f6294f9aa09f59a574b5dcd33be54e16b39377984f3d5658cda44950fa0f8fc

          SHA512

          e52e0aa7fe3f79e36330c455d944653d449ba05b2f9abee0914a0910c3452cfa679a40441f9ac696b3ccf9445cbb85095747e86153402fc362bb30ac08249a63

        • C:\Users\Admin\AppData\Local\Temp\is-RUIJT.tmp\is-SAC6D.tmp

          Filesize

          723KB

          MD5

          7fd7ec3d32ed2a377fa18e8931475b2e

          SHA1

          30b386da1750701f78cbf65550f32661d8a4175f

          SHA256

          0290cf819c841a17d433eb1f768d2bad4ad57db003563a925688b1c86bef5455

          SHA512

          db2ac34c30b89c2551d9e16de7d748e4a984141c889707a9edd165f328e75260ff6fb8d7383fb7c7fcf10000c08a10af03a50ce7b3665a8e935c0d5d66e59334

        • C:\Users\Admin\AppData\Local\Temp\is-RUIJT.tmp\is-SAC6D.tmp

          Filesize

          723KB

          MD5

          7fd7ec3d32ed2a377fa18e8931475b2e

          SHA1

          30b386da1750701f78cbf65550f32661d8a4175f

          SHA256

          0290cf819c841a17d433eb1f768d2bad4ad57db003563a925688b1c86bef5455

          SHA512

          db2ac34c30b89c2551d9e16de7d748e4a984141c889707a9edd165f328e75260ff6fb8d7383fb7c7fcf10000c08a10af03a50ce7b3665a8e935c0d5d66e59334

        • C:\Users\Admin\AppData\Roaming\{6cebb340-6208-11ed-bf50-806e6f6e6963}\2frXjStDTE2hl.exe

          Filesize

          72KB

          MD5

          3fb36cb0b7172e5298d2992d42984d06

          SHA1

          439827777df4a337cbb9fa4a4640d0d3fa1738b7

          SHA256

          27ae813ceff8aa56e9fa68c8e50bb1c6c4a01636015eac4bd8bf444afb7020d6

          SHA512

          6b39cb32d77200209a25080ac92bc71b1f468e2946b651023793f3585ee6034adc70924dbd751cf4a51b5e71377854f1ab43c2dd287d4837e7b544ff886f470c

        • C:\Users\Admin\AppData\Roaming\{6cebb340-6208-11ed-bf50-806e6f6e6963}\2frXjStDTE2hl.exe

          Filesize

          72KB

          MD5

          3fb36cb0b7172e5298d2992d42984d06

          SHA1

          439827777df4a337cbb9fa4a4640d0d3fa1738b7

          SHA256

          27ae813ceff8aa56e9fa68c8e50bb1c6c4a01636015eac4bd8bf444afb7020d6

          SHA512

          6b39cb32d77200209a25080ac92bc71b1f468e2946b651023793f3585ee6034adc70924dbd751cf4a51b5e71377854f1ab43c2dd287d4837e7b544ff886f470c

        • memory/1080-135-0x0000000000400000-0x0000000000427000-memory.dmp

          Filesize

          156KB

        • memory/1080-155-0x0000000000400000-0x0000000000427000-memory.dmp

          Filesize

          156KB

        • memory/1080-132-0x0000000000400000-0x0000000000427000-memory.dmp

          Filesize

          156KB

        • memory/5112-143-0x0000000000400000-0x0000000001530000-memory.dmp

          Filesize

          17.2MB

        • memory/5112-151-0x0000000000400000-0x0000000001530000-memory.dmp

          Filesize

          17.2MB

        • memory/5112-147-0x0000000010000000-0x000000001001B000-memory.dmp

          Filesize

          108KB

        • memory/5112-142-0x0000000000400000-0x0000000001530000-memory.dmp

          Filesize

          17.2MB

        • memory/5112-154-0x0000000000400000-0x0000000001530000-memory.dmp

          Filesize

          17.2MB