Analysis

  • max time kernel
    91s
  • max time network
    129s
  • 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, 03:17

General

  • Target

    file.exe

  • Size

    2.0MB

  • MD5

    24e5a78cf8e9d0e4f66d21920edce889

  • SHA1

    6a4afe76c8a36d6cd00b71842d78c9ee7033f1df

  • SHA256

    c27756b2d89d78d665ec7507ffacd7825f174dad2e69610f08a05cdfd8194868

  • SHA512

    aecd434351c6eedfe6b3900ce2eb04ebe27cdb8ce3eabe3330838957604079f9ca56db99eb263628af3b021a713b999b0733ac7bd2f8ddba1099af142fd3d186

  • SSDEEP

    49152:j1MIVklHN5IyvvCjkQVqTKWY20UWP7p30:j1M0kVFoLQfLGd0

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:4404
    • C:\Users\Admin\AppData\Local\Temp\is-5H1D1.tmp\is-8GRCL.tmp
      "C:\Users\Admin\AppData\Local\Temp\is-5H1D1.tmp\is-8GRCL.tmp" /SL4 $B0170 "C:\Users\Admin\AppData\Local\Temp\file.exe" 1791779 133120
      2⤵
      • Executes dropped EXE
      • Loads dropped DLL
      • Drops file in Program Files directory
      • Suspicious use of WriteProcessMemory
      PID:1200
      • C:\Program Files (x86)\Split Files\SplitFiles118.exe
        "C:\Program Files (x86)\Split Files\SplitFiles118.exe"
        3⤵
        • Executes dropped EXE
        • Checks computer location settings
        • Suspicious behavior: EnumeratesProcesses
        • Suspicious use of WriteProcessMemory
        PID:2840
        • C:\Users\Admin\AppData\Roaming\{6e1ce040-6208-11ed-b5ce-806e6f6e6963}\3dWQw3ZLI.exe
          4⤵
          • Executes dropped EXE
          PID:232
        • C:\Windows\SysWOW64\cmd.exe
          "C:\Windows\System32\cmd.exe" /c taskkill /im "SplitFiles118.exe" /f & erase "C:\Program Files (x86)\Split Files\SplitFiles118.exe" & exit
          4⤵
          • Suspicious use of WriteProcessMemory
          PID:3772
          • C:\Windows\SysWOW64\taskkill.exe
            taskkill /im "SplitFiles118.exe" /f
            5⤵
            • Kills process with taskkill
            • Suspicious use of AdjustPrivilegeToken
            PID:2192

Network

        MITRE ATT&CK Enterprise v6

        Replay Monitor

        Loading Replay Monitor...

        Downloads

        • C:\Program Files (x86)\Split Files\SplitFiles118.exe

          Filesize

          3.3MB

          MD5

          c7c087a7138c8e4911ae69f7cf6592d9

          SHA1

          8dbc2f9732aaa66f69a4b1f57ca20828eca908c3

          SHA256

          d5132780c6f824d620e59c66c2bbb027b96e2728af13dc2221eb4ee044620a75

          SHA512

          faffd8a3317013b0e78046fdccdbfdc4dcdbe3f60d73acaadee3403d5f0e87de9768b7b91cda327559dc02f8e594e8125f3c0a6dfe8b5bbbfd4d95df5040b1b9

        • C:\Program Files (x86)\Split Files\SplitFiles118.exe

          Filesize

          3.3MB

          MD5

          c7c087a7138c8e4911ae69f7cf6592d9

          SHA1

          8dbc2f9732aaa66f69a4b1f57ca20828eca908c3

          SHA256

          d5132780c6f824d620e59c66c2bbb027b96e2728af13dc2221eb4ee044620a75

          SHA512

          faffd8a3317013b0e78046fdccdbfdc4dcdbe3f60d73acaadee3403d5f0e87de9768b7b91cda327559dc02f8e594e8125f3c0a6dfe8b5bbbfd4d95df5040b1b9

        • C:\Users\Admin\AppData\Local\Temp\is-5H1D1.tmp\is-8GRCL.tmp

          Filesize

          723KB

          MD5

          703b4da86c2d38881230d26bc1051cb2

          SHA1

          13b9e7582e94cb6e4f703bc08a28c53cdc003019

          SHA256

          90b8f255f68be9f092608be15074b6fc3c4be724ae82dae5adb390307b121c89

          SHA512

          e3d80bc78b41e24450effe46f713e9bf7fcd376141a3c6b3f20e3ec81c9c3ab85d300104b2dbbef9512f92a2b613dbc326899e442dc669490c1e192f79a7363b

        • C:\Users\Admin\AppData\Local\Temp\is-5H1D1.tmp\is-8GRCL.tmp

          Filesize

          723KB

          MD5

          703b4da86c2d38881230d26bc1051cb2

          SHA1

          13b9e7582e94cb6e4f703bc08a28c53cdc003019

          SHA256

          90b8f255f68be9f092608be15074b6fc3c4be724ae82dae5adb390307b121c89

          SHA512

          e3d80bc78b41e24450effe46f713e9bf7fcd376141a3c6b3f20e3ec81c9c3ab85d300104b2dbbef9512f92a2b613dbc326899e442dc669490c1e192f79a7363b

        • C:\Users\Admin\AppData\Local\Temp\is-U2U38.tmp\_iscrypt.dll

          Filesize

          2KB

          MD5

          a69559718ab506675e907fe49deb71e9

          SHA1

          bc8f404ffdb1960b50c12ff9413c893b56f2e36f

          SHA256

          2f6294f9aa09f59a574b5dcd33be54e16b39377984f3d5658cda44950fa0f8fc

          SHA512

          e52e0aa7fe3f79e36330c455d944653d449ba05b2f9abee0914a0910c3452cfa679a40441f9ac696b3ccf9445cbb85095747e86153402fc362bb30ac08249a63

        • C:\Users\Admin\AppData\Roaming\{6e1ce040-6208-11ed-b5ce-806e6f6e6963}\3dWQw3ZLI.exe

          Filesize

          72KB

          MD5

          3fb36cb0b7172e5298d2992d42984d06

          SHA1

          439827777df4a337cbb9fa4a4640d0d3fa1738b7

          SHA256

          27ae813ceff8aa56e9fa68c8e50bb1c6c4a01636015eac4bd8bf444afb7020d6

          SHA512

          6b39cb32d77200209a25080ac92bc71b1f468e2946b651023793f3585ee6034adc70924dbd751cf4a51b5e71377854f1ab43c2dd287d4837e7b544ff886f470c

        • C:\Users\Admin\AppData\Roaming\{6e1ce040-6208-11ed-b5ce-806e6f6e6963}\3dWQw3ZLI.exe

          Filesize

          72KB

          MD5

          3fb36cb0b7172e5298d2992d42984d06

          SHA1

          439827777df4a337cbb9fa4a4640d0d3fa1738b7

          SHA256

          27ae813ceff8aa56e9fa68c8e50bb1c6c4a01636015eac4bd8bf444afb7020d6

          SHA512

          6b39cb32d77200209a25080ac92bc71b1f468e2946b651023793f3585ee6034adc70924dbd751cf4a51b5e71377854f1ab43c2dd287d4837e7b544ff886f470c

        • memory/2840-152-0x0000000000400000-0x000000000154D000-memory.dmp

          Filesize

          17.3MB

        • memory/2840-144-0x0000000000400000-0x000000000154D000-memory.dmp

          Filesize

          17.3MB

        • memory/2840-143-0x0000000000400000-0x000000000154D000-memory.dmp

          Filesize

          17.3MB

        • memory/2840-148-0x0000000010000000-0x000000001001B000-memory.dmp

          Filesize

          108KB

        • memory/2840-155-0x0000000000400000-0x000000000154D000-memory.dmp

          Filesize

          17.3MB

        • memory/4404-132-0x0000000000400000-0x0000000000427000-memory.dmp

          Filesize

          156KB

        • memory/4404-138-0x0000000000400000-0x0000000000427000-memory.dmp

          Filesize

          156KB

        • memory/4404-156-0x0000000000400000-0x0000000000427000-memory.dmp

          Filesize

          156KB