Analysis

  • max time kernel
    108s
  • 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
    22/12/2022, 23:31

General

  • Target

    file.exe

  • Size

    1.8MB

  • MD5

    33f661f1fbb9e71fe88d2a8f921ac6f1

  • SHA1

    cb0522b6879fbb6cb978a0f566c5468b905f3b5e

  • SHA256

    b0cefcdca903547afa59d7bc788e29a60778b8c3500e3aaccbc8d6cab2bbc2f7

  • SHA512

    c37ddba0ddec23c11ba4049d710e06338bdd8cc3f1f2b4fe03a519f6e2145104ec5ead44e88b0d5c074fa8fd120275e17da5cb83dcba2841045c76daa7e61a05

  • SSDEEP

    49152:D6ATLFyBnQo9EEWH0f8zOMEJUAKt/ibe9ldShUWP7p3f:D4Q1Of8zOgXpibWdShUGdf

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:1404
    • C:\Users\Admin\AppData\Local\Temp\is-TU3Q0.tmp\is-I3M1L.tmp
      "C:\Users\Admin\AppData\Local\Temp\is-TU3Q0.tmp\is-I3M1L.tmp" /SL4 $701BC "C:\Users\Admin\AppData\Local\Temp\file.exe" 1682048 133120
      2⤵
      • Executes dropped EXE
      • Loads dropped DLL
      • Drops file in Program Files directory
      • Suspicious use of WriteProcessMemory
      PID:2752
      • 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:1548
        • C:\Users\Admin\AppData\Roaming\{99cae5c0-1ab4-11ed-899c-806e6f6e6963}\w3QeUT6fKb2R.exe
          4⤵
          • Executes dropped EXE
          PID:4980
        • 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:3772
          • C:\Windows\SysWOW64\taskkill.exe
            taskkill /im "SplitFiles117.exe" /f
            5⤵
            • Kills process with taskkill
            • Suspicious use of AdjustPrivilegeToken
            PID:1644

Network

        MITRE ATT&CK Enterprise v6

        Replay Monitor

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        Downloads

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

          Filesize

          3.2MB

          MD5

          00e8b154e8fbaae5fa6f71d2a1b6e688

          SHA1

          5c97eb81ceea2f0dd999e9edb2cdaf0bf94ab41a

          SHA256

          c3f83645bc8a0483b979d58b0860f447ffd36d501f00507c45a659c1ddea8a29

          SHA512

          1cdbcaa2fcf0560d2ab1ddab3d93a5eb4aec0f35e9e09e06e8881e273a82173b8c8a215b40ea64f8a7660fee7ed7d1a081793333b0b99a80d805732fa87610c5

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

          Filesize

          3.2MB

          MD5

          00e8b154e8fbaae5fa6f71d2a1b6e688

          SHA1

          5c97eb81ceea2f0dd999e9edb2cdaf0bf94ab41a

          SHA256

          c3f83645bc8a0483b979d58b0860f447ffd36d501f00507c45a659c1ddea8a29

          SHA512

          1cdbcaa2fcf0560d2ab1ddab3d93a5eb4aec0f35e9e09e06e8881e273a82173b8c8a215b40ea64f8a7660fee7ed7d1a081793333b0b99a80d805732fa87610c5

        • C:\Users\Admin\AppData\Local\Temp\is-4UKRR.tmp\_iscrypt.dll

          Filesize

          2KB

          MD5

          a69559718ab506675e907fe49deb71e9

          SHA1

          bc8f404ffdb1960b50c12ff9413c893b56f2e36f

          SHA256

          2f6294f9aa09f59a574b5dcd33be54e16b39377984f3d5658cda44950fa0f8fc

          SHA512

          e52e0aa7fe3f79e36330c455d944653d449ba05b2f9abee0914a0910c3452cfa679a40441f9ac696b3ccf9445cbb85095747e86153402fc362bb30ac08249a63

        • C:\Users\Admin\AppData\Local\Temp\is-TU3Q0.tmp\is-I3M1L.tmp

          Filesize

          723KB

          MD5

          7fd7ec3d32ed2a377fa18e8931475b2e

          SHA1

          30b386da1750701f78cbf65550f32661d8a4175f

          SHA256

          0290cf819c841a17d433eb1f768d2bad4ad57db003563a925688b1c86bef5455

          SHA512

          db2ac34c30b89c2551d9e16de7d748e4a984141c889707a9edd165f328e75260ff6fb8d7383fb7c7fcf10000c08a10af03a50ce7b3665a8e935c0d5d66e59334

        • C:\Users\Admin\AppData\Local\Temp\is-TU3Q0.tmp\is-I3M1L.tmp

          Filesize

          723KB

          MD5

          7fd7ec3d32ed2a377fa18e8931475b2e

          SHA1

          30b386da1750701f78cbf65550f32661d8a4175f

          SHA256

          0290cf819c841a17d433eb1f768d2bad4ad57db003563a925688b1c86bef5455

          SHA512

          db2ac34c30b89c2551d9e16de7d748e4a984141c889707a9edd165f328e75260ff6fb8d7383fb7c7fcf10000c08a10af03a50ce7b3665a8e935c0d5d66e59334

        • C:\Users\Admin\AppData\Roaming\{99cae5c0-1ab4-11ed-899c-806e6f6e6963}\w3QeUT6fKb2R.exe

          Filesize

          72KB

          MD5

          3fb36cb0b7172e5298d2992d42984d06

          SHA1

          439827777df4a337cbb9fa4a4640d0d3fa1738b7

          SHA256

          27ae813ceff8aa56e9fa68c8e50bb1c6c4a01636015eac4bd8bf444afb7020d6

          SHA512

          6b39cb32d77200209a25080ac92bc71b1f468e2946b651023793f3585ee6034adc70924dbd751cf4a51b5e71377854f1ab43c2dd287d4837e7b544ff886f470c

        • C:\Users\Admin\AppData\Roaming\{99cae5c0-1ab4-11ed-899c-806e6f6e6963}\w3QeUT6fKb2R.exe

          Filesize

          72KB

          MD5

          3fb36cb0b7172e5298d2992d42984d06

          SHA1

          439827777df4a337cbb9fa4a4640d0d3fa1738b7

          SHA256

          27ae813ceff8aa56e9fa68c8e50bb1c6c4a01636015eac4bd8bf444afb7020d6

          SHA512

          6b39cb32d77200209a25080ac92bc71b1f468e2946b651023793f3585ee6034adc70924dbd751cf4a51b5e71377854f1ab43c2dd287d4837e7b544ff886f470c

        • memory/1404-155-0x0000000000400000-0x0000000000427000-memory.dmp

          Filesize

          156KB

        • memory/1404-132-0x0000000000400000-0x0000000000427000-memory.dmp

          Filesize

          156KB

        • memory/1404-150-0x0000000000400000-0x0000000000427000-memory.dmp

          Filesize

          156KB

        • memory/1548-151-0x0000000000400000-0x0000000001530000-memory.dmp

          Filesize

          17.2MB

        • memory/1548-142-0x0000000000400000-0x0000000001530000-memory.dmp

          Filesize

          17.2MB

        • memory/1548-146-0x0000000010000000-0x000000001001B000-memory.dmp

          Filesize

          108KB

        • memory/1548-141-0x0000000000400000-0x0000000001530000-memory.dmp

          Filesize

          17.2MB

        • memory/1548-154-0x0000000000400000-0x0000000001530000-memory.dmp

          Filesize

          17.2MB