Analysis

  • max time kernel
    63s
  • max time network
    66s
  • platform
    windows7_x64
  • resource
    win7-20220901-en
  • resource tags

    arch:x64arch:x86image:win7-20220901-enlocale:en-usos:windows7-x64system
  • submitted
    01/01/2023, 02:27

General

  • Target
    file.exe
  • Size 2.1MB
  • Sample230101-cxevdsbb22
  • SHA256 d65685a4678fb6c3923349de486034dc402d834b8686d7d51252806a281d8f7f
  • MD5 SHA1 SHA512 SSDEEP
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
  • Loads dropped DLL 10 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 3 IoCs
  • Suspicious use of AdjustPrivilegeToken 3 IoCs
  • Suspicious use of WriteProcessMemory 35 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\file.exe
    "C:\Users\Admin\AppData\Local\Temp\file.exe"
    1⤵
    • Loads dropped DLL
    • Suspicious use of WriteProcessMemory
    PID:1272
    • C:\Users\Admin\AppData\Local\Temp\is-BS7QK.tmp\is-6NEKR.tmp
      "C:\Users\Admin\AppData\Local\Temp\is-BS7QK.tmp\is-6NEKR.tmp" /SL4 $80022 "C:\Users\Admin\AppData\Local\Temp\file.exe" 1900650 209408
      2⤵
      • Executes dropped EXE
      • Loads dropped DLL
      • Drops file in Program Files directory
      • Suspicious use of AdjustPrivilegeToken
      • Suspicious use of WriteProcessMemory
      PID:1328
      • C:\Program Files (x86)\Split Files\SplitFiles126.exe
        "C:\Program Files (x86)\Split Files\SplitFiles126.exe"
        3⤵
        • Executes dropped EXE
        • Loads dropped DLL
        • Suspicious behavior: EnumeratesProcesses
        • Suspicious use of WriteProcessMemory
        PID:1268
        • C:\Users\Admin\AppData\Roaming\{846ee340-7039-11de-9d20-806e6f6e6963}\Q0wzFqYDtAHopj.exe
          4⤵
          • Executes dropped EXE
          • Loads dropped DLL
          PID:268
        • C:\Windows\SysWOW64\cmd.exe
          "C:\Windows\System32\cmd.exe" /c taskkill /im "SplitFiles126.exe" /f & erase "C:\Program Files (x86)\Split Files\SplitFiles126.exe" & exit
          4⤵
          • Suspicious use of WriteProcessMemory
          PID:2044
          • C:\Windows\SysWOW64\taskkill.exe
            taskkill /im "SplitFiles126.exe" /f
            5⤵
            • Kills process with taskkill
            • Suspicious use of AdjustPrivilegeToken
            PID:880

Network

        MITRE ATT&CK Enterprise v6

        Replay Monitor

        Loading Replay Monitor...

        Downloads

        SplitFiles126.exe

        • Path C:\Program Files (x86)\Split Files\SplitFiles126.exe
        • Size 3.5MB
        • SHA256 98f150cabf053f3f6429ea9a35f21367bce8bdc081894b50eb4caf797f22bc5f
        • MD5 SHA1 SHA512 SSDEEP

        SplitFiles126.exe

        • Path C:\Program Files (x86)\Split Files\SplitFiles126.exe
        • Size 3.5MB
        • SHA256 98f150cabf053f3f6429ea9a35f21367bce8bdc081894b50eb4caf797f22bc5f
        • MD5 SHA1 SHA512 SSDEEP

        is-6NEKR.tmp

        • Path C:\Users\Admin\AppData\Local\Temp\is-BS7QK.tmp\is-6NEKR.tmp
        • Size 798KB
        • SHA256 5639f567be5695dc2a4b029185bf2ae9147e98a5194c01726f864ba2fbffcfd1
        • MD5 SHA1 SHA512 SSDEEP

        is-6NEKR.tmp

        • Path C:\Users\Admin\AppData\Local\Temp\is-BS7QK.tmp\is-6NEKR.tmp
        • Size 798KB
        • SHA256 5639f567be5695dc2a4b029185bf2ae9147e98a5194c01726f864ba2fbffcfd1
        • MD5 SHA1 SHA512 SSDEEP

        Q0wzFqYDtAHopj.exe

        • Path C:\Users\Admin\AppData\Roaming\{846ee340-7039-11de-9d20-806e6f6e6963}\Q0wzFqYDtAHopj.exe
        • Size 72KB
        • SHA256 27ae813ceff8aa56e9fa68c8e50bb1c6c4a01636015eac4bd8bf444afb7020d6
        • MD5 SHA1 SHA512 SSDEEP

        Q0wzFqYDtAHopj.exe

        • Path C:\Users\Admin\AppData\Roaming\{846ee340-7039-11de-9d20-806e6f6e6963}\Q0wzFqYDtAHopj.exe
        • Size 72KB
        • SHA256 27ae813ceff8aa56e9fa68c8e50bb1c6c4a01636015eac4bd8bf444afb7020d6
        • MD5 SHA1 SHA512 SSDEEP

        SplitFiles126.exe

        • Path \Program Files (x86)\Split Files\SplitFiles126.exe
        • Size 3.5MB
        • SHA256 98f150cabf053f3f6429ea9a35f21367bce8bdc081894b50eb4caf797f22bc5f
        • MD5 SHA1 SHA512 SSDEEP

        SplitFiles126.exe

        • Path \Program Files (x86)\Split Files\SplitFiles126.exe
        • Size 3.5MB
        • SHA256 98f150cabf053f3f6429ea9a35f21367bce8bdc081894b50eb4caf797f22bc5f
        • MD5 SHA1 SHA512 SSDEEP

        SplitFiles126.exe

        • Path \Program Files (x86)\Split Files\SplitFiles126.exe
        • Size 3.5MB
        • SHA256 98f150cabf053f3f6429ea9a35f21367bce8bdc081894b50eb4caf797f22bc5f
        • MD5 SHA1 SHA512 SSDEEP

        _iscrypt.dll

        • Path \Users\Admin\AppData\Local\Temp\is-2DS0B.tmp\_iscrypt.dll
        • Size 2KB
        • SHA256 2f6294f9aa09f59a574b5dcd33be54e16b39377984f3d5658cda44950fa0f8fc
        • MD5 SHA1 SHA512

        _shfoldr.dll

        • Path \Users\Admin\AppData\Local\Temp\is-2DS0B.tmp\_isetup\_shfoldr.dll
        • Size 22KB
        • SHA256 9884e9d1b4f8a873ccbd81f8ad0ae257776d2348d027d811a56475e028360d87
        • MD5 SHA1 SHA512 SSDEEP

        _shfoldr.dll

        • Path \Users\Admin\AppData\Local\Temp\is-2DS0B.tmp\_isetup\_shfoldr.dll
        • Size 22KB
        • SHA256 9884e9d1b4f8a873ccbd81f8ad0ae257776d2348d027d811a56475e028360d87
        • MD5 SHA1 SHA512 SSDEEP

        is-6NEKR.tmp

        • Path \Users\Admin\AppData\Local\Temp\is-BS7QK.tmp\is-6NEKR.tmp
        • Size 798KB
        • SHA256 5639f567be5695dc2a4b029185bf2ae9147e98a5194c01726f864ba2fbffcfd1
        • MD5 SHA1 SHA512 SSDEEP

        Q0wzFqYDtAHopj.exe

        • Path \Users\Admin\AppData\Roaming\{846ee340-7039-11de-9d20-806e6f6e6963}\Q0wzFqYDtAHopj.exe
        • Size 72KB
        • SHA256 27ae813ceff8aa56e9fa68c8e50bb1c6c4a01636015eac4bd8bf444afb7020d6
        • MD5 SHA1 SHA512 SSDEEP

        Q0wzFqYDtAHopj.exe

        • Path \Users\Admin\AppData\Roaming\{846ee340-7039-11de-9d20-806e6f6e6963}\Q0wzFqYDtAHopj.exe
        • Size 72KB
        • SHA256 27ae813ceff8aa56e9fa68c8e50bb1c6c4a01636015eac4bd8bf444afb7020d6
        • MD5 SHA1 SHA512 SSDEEP

        Q0wzFqYDtAHopj.exe

        • Path \Users\Admin\AppData\Roaming\{846ee340-7039-11de-9d20-806e6f6e6963}\Q0wzFqYDtAHopj.exe
        • Size 72KB
        • SHA256 27ae813ceff8aa56e9fa68c8e50bb1c6c4a01636015eac4bd8bf444afb7020d6
        • MD5 SHA1 SHA512 SSDEEP

        memory/1268-92-0x0000000000400000-0x0000000001581000-memory.dmp

        memory/1268-87-0x0000000010000000-0x000000001001B000-memory.dmp

        memory/1268-77-0x0000000000400000-0x0000000001581000-memory.dmp

        memory/1268-78-0x0000000000400000-0x0000000001581000-memory.dmp

        memory/1268-97-0x0000000000400000-0x0000000001581000-memory.dmp

        memory/1268-75-0x0000000001EC0000-0x0000000003041000-memory.dmp

        memory/1268-74-0x0000000000400000-0x0000000001581000-memory.dmp

        memory/1268-91-0x0000000000400000-0x0000000001581000-memory.dmp

        memory/1268-76-0x0000000001EC0000-0x0000000003041000-memory.dmp

        memory/1272-54-0x0000000075931000-0x0000000075933000-memory.dmp

        memory/1272-55-0x0000000000400000-0x0000000000439000-memory.dmp

        memory/1272-69-0x0000000000400000-0x0000000000439000-memory.dmp

        memory/1272-98-0x0000000000400000-0x0000000000439000-memory.dmp

        memory/1328-86-0x0000000003A80000-0x0000000004C01000-memory.dmp

        memory/1328-73-0x0000000003A80000-0x0000000004C01000-memory.dmp