Analysis

  • max time kernel
    91s
  • 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
    29/12/2022, 06:44

General

  • Target

    file.exe

  • Size

    1.7MB

  • MD5

    751e38a4b2397b818c0b52aefef8632e

  • SHA1

    db3a0abb62153523aa5bdd276741c70a594bb31e

  • SHA256

    46bfe22fa00aba9e58f6e7afb790b0a7ad7c31e57260fbc499162648375a39e5

  • SHA512

    fd70ce3fba25c076c59b8be9802f9cd813ea9bb109c707653d609f54ed832810a363809d14c4d0005e658399229d34e1dba58293409929a0e21a800084176a91

  • SSDEEP

    49152:0i7w/Qf4GVx1lnA8Ipzsj5AAME6lMNDf2Vp5FZX+qm9DnlNX:0i7w/lYln+wjyeNDf2VFJ14nD

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:972
    • C:\Users\Admin\AppData\Local\Temp\is-POVCE.tmp\is-3CMA3.tmp
      "C:\Users\Admin\AppData\Local\Temp\is-POVCE.tmp\is-3CMA3.tmp" /SL4 $D0050 "C:\Users\Admin\AppData\Local\Temp\file.exe" 1561047 96768
      2⤵
      • Executes dropped EXE
      • Loads dropped DLL
      • Drops file in Program Files directory
      • Suspicious use of WriteProcessMemory
      PID:3460
      • C:\Program Files (x86)\Split Files\SplitFiles124.exe
        "C:\Program Files (x86)\Split Files\SplitFiles124.exe"
        3⤵
        • Executes dropped EXE
        • Checks computer location settings
        • Suspicious behavior: EnumeratesProcesses
        • Suspicious use of WriteProcessMemory
        PID:3932
        • C:\Users\Admin\AppData\Roaming\{1ca2f389-1ab8-11ed-aebb-806e6f6e6963}\s7FDTDkSx3PTx.exe
          4⤵
          • Executes dropped EXE
          PID:816
        • C:\Windows\SysWOW64\cmd.exe
          "C:\Windows\System32\cmd.exe" /c taskkill /im "SplitFiles124.exe" /f & erase "C:\Program Files (x86)\Split Files\SplitFiles124.exe" & exit
          4⤵
          • Suspicious use of WriteProcessMemory
          PID:1996
          • C:\Windows\SysWOW64\taskkill.exe
            taskkill /im "SplitFiles124.exe" /f
            5⤵
            • Kills process with taskkill
            • Suspicious use of AdjustPrivilegeToken
            PID:2204

Network

MITRE ATT&CK Enterprise v6

Replay Monitor

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Downloads

  • C:\Program Files (x86)\Split Files\SplitFiles124.exe

    Filesize

    3.1MB

    MD5

    d71e2b4f365eb8006ebc5b45c0af5abb

    SHA1

    498e4e9d17932927c85e24562e67cce3ceba171a

    SHA256

    bc301ea0de2cec56ac9be6dcaf9dca65f1d430caeb111731524ef39e7af5a73e

    SHA512

    981a1af6b632738f4a9de8a373320eaf879a92ea6ec169981ca8b78557a03127623fa03c141586aea7e377eca3ab82c4ecedfcfd9a2188a2e17011f4f7c6f982

  • C:\Program Files (x86)\Split Files\SplitFiles124.exe

    Filesize

    3.1MB

    MD5

    d71e2b4f365eb8006ebc5b45c0af5abb

    SHA1

    498e4e9d17932927c85e24562e67cce3ceba171a

    SHA256

    bc301ea0de2cec56ac9be6dcaf9dca65f1d430caeb111731524ef39e7af5a73e

    SHA512

    981a1af6b632738f4a9de8a373320eaf879a92ea6ec169981ca8b78557a03127623fa03c141586aea7e377eca3ab82c4ecedfcfd9a2188a2e17011f4f7c6f982

  • C:\Users\Admin\AppData\Local\Temp\is-5257E.tmp\_iscrypt.dll

    Filesize

    2KB

    MD5

    a69559718ab506675e907fe49deb71e9

    SHA1

    bc8f404ffdb1960b50c12ff9413c893b56f2e36f

    SHA256

    2f6294f9aa09f59a574b5dcd33be54e16b39377984f3d5658cda44950fa0f8fc

    SHA512

    e52e0aa7fe3f79e36330c455d944653d449ba05b2f9abee0914a0910c3452cfa679a40441f9ac696b3ccf9445cbb85095747e86153402fc362bb30ac08249a63

  • C:\Users\Admin\AppData\Local\Temp\is-POVCE.tmp\is-3CMA3.tmp

    Filesize

    688KB

    MD5

    807603f3a565337ee2ac3e819b25ee58

    SHA1

    5cc4e6c82fbdda6697a1117561f23731d51baacd

    SHA256

    682dd0a4ea6b0d763a1adb14def8657518a4879e454c7ece43505910dd448423

    SHA512

    252831b5fe5869c0abd25f246fe161e5b8218e9c54231fa9c5c78d5ffe6ff0c8e3d1f9ea3316f74b47ce372f1f8f06edd8e147711633f4028acd0cf7d5cd946d

  • C:\Users\Admin\AppData\Local\Temp\is-POVCE.tmp\is-3CMA3.tmp

    Filesize

    688KB

    MD5

    807603f3a565337ee2ac3e819b25ee58

    SHA1

    5cc4e6c82fbdda6697a1117561f23731d51baacd

    SHA256

    682dd0a4ea6b0d763a1adb14def8657518a4879e454c7ece43505910dd448423

    SHA512

    252831b5fe5869c0abd25f246fe161e5b8218e9c54231fa9c5c78d5ffe6ff0c8e3d1f9ea3316f74b47ce372f1f8f06edd8e147711633f4028acd0cf7d5cd946d

  • C:\Users\Admin\AppData\Roaming\{1ca2f389-1ab8-11ed-aebb-806e6f6e6963}\s7FDTDkSx3PTx.exe

    Filesize

    72KB

    MD5

    3fb36cb0b7172e5298d2992d42984d06

    SHA1

    439827777df4a337cbb9fa4a4640d0d3fa1738b7

    SHA256

    27ae813ceff8aa56e9fa68c8e50bb1c6c4a01636015eac4bd8bf444afb7020d6

    SHA512

    6b39cb32d77200209a25080ac92bc71b1f468e2946b651023793f3585ee6034adc70924dbd751cf4a51b5e71377854f1ab43c2dd287d4837e7b544ff886f470c

  • C:\Users\Admin\AppData\Roaming\{1ca2f389-1ab8-11ed-aebb-806e6f6e6963}\s7FDTDkSx3PTx.exe

    Filesize

    72KB

    MD5

    3fb36cb0b7172e5298d2992d42984d06

    SHA1

    439827777df4a337cbb9fa4a4640d0d3fa1738b7

    SHA256

    27ae813ceff8aa56e9fa68c8e50bb1c6c4a01636015eac4bd8bf444afb7020d6

    SHA512

    6b39cb32d77200209a25080ac92bc71b1f468e2946b651023793f3585ee6034adc70924dbd751cf4a51b5e71377854f1ab43c2dd287d4837e7b544ff886f470c

  • memory/972-157-0x0000000000400000-0x000000000041E000-memory.dmp

    Filesize

    120KB

  • memory/972-132-0x0000000000400000-0x000000000041E000-memory.dmp

    Filesize

    120KB

  • memory/972-152-0x0000000000400000-0x000000000041E000-memory.dmp

    Filesize

    120KB

  • memory/972-134-0x0000000000400000-0x000000000041E000-memory.dmp

    Filesize

    120KB

  • memory/3932-143-0x0000000000400000-0x000000000151A000-memory.dmp

    Filesize

    17.1MB

  • memory/3932-148-0x0000000010000000-0x000000001001B000-memory.dmp

    Filesize

    108KB

  • memory/3932-153-0x0000000000400000-0x000000000151A000-memory.dmp

    Filesize

    17.1MB

  • memory/3932-144-0x0000000000400000-0x000000000151A000-memory.dmp

    Filesize

    17.1MB

  • memory/3932-142-0x0000000000400000-0x000000000151A000-memory.dmp

    Filesize

    17.1MB

  • memory/3932-156-0x0000000000400000-0x000000000151A000-memory.dmp

    Filesize

    17.1MB