Analysis

  • max time kernel
    58s
  • max time network
    59s
  • platform
    windows7_x64
  • resource
    win7-20220812-en
  • resource tags

    arch:x64arch:x86image:win7-20220812-enlocale:en-usos:windows7-x64system
  • submitted
    23/12/2022, 01:31

General

  • Target
    file.exe
  • Size 2.0MB
  • Sample221223-bxdfwsff33
  • SHA256 876aa06eb3062b728e3507fdf753bac180b9a1e57ff8ed46078367f9d41dd745
  • 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:1956
    • C:\Users\Admin\AppData\Local\Temp\is-EPN6R.tmp\is-5C2M6.tmp
      "C:\Users\Admin\AppData\Local\Temp\is-EPN6R.tmp\is-5C2M6.tmp" /SL4 $60126 "C:\Users\Admin\AppData\Local\Temp\file.exe" 1800857 133120
      2⤵
      • Executes dropped EXE
      • Loads dropped DLL
      • Drops file in Program Files directory
      • Suspicious use of AdjustPrivilegeToken
      • Suspicious use of WriteProcessMemory
      PID:1756
      • C:\Program Files (x86)\Split Files\SplitFiles117.exe
        "C:\Program Files (x86)\Split Files\SplitFiles117.exe"
        3⤵
        • Executes dropped EXE
        • Loads dropped DLL
        • Suspicious behavior: EnumeratesProcesses
        • Suspicious use of WriteProcessMemory
        PID:1336
        • C:\Users\Admin\AppData\Roaming\{846ee340-7039-11de-9d20-806e6f6e6963}\RYJEQxj4zl6OH8.exe
          4⤵
          • Executes dropped EXE
          • Loads dropped DLL
          PID:992
        • 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:1492
          • C:\Windows\SysWOW64\taskkill.exe
            taskkill /im "SplitFiles117.exe" /f
            5⤵
            • Kills process with taskkill
            • Suspicious use of AdjustPrivilegeToken
            PID:1980

Network

        MITRE ATT&CK Enterprise v6

        Replay Monitor

        Loading Replay Monitor...

        Downloads

        SplitFiles117.exe

        • Path C:\Program Files (x86)\Split Files\SplitFiles117.exe
        • Size 3.4MB
        • SHA256 ec15ad327570e4fbe7871075765a25f9afff36d8763f2e4bd4c894c86b31e02b
        • MD5 SHA1 SHA512 SSDEEP

        SplitFiles117.exe

        • Path C:\Program Files (x86)\Split Files\SplitFiles117.exe
        • Size 3.4MB
        • SHA256 ec15ad327570e4fbe7871075765a25f9afff36d8763f2e4bd4c894c86b31e02b
        • MD5 SHA1 SHA512 SSDEEP

        is-5C2M6.tmp

        • Path C:\Users\Admin\AppData\Local\Temp\is-EPN6R.tmp\is-5C2M6.tmp
        • Size 723KB
        • SHA256 0290cf819c841a17d433eb1f768d2bad4ad57db003563a925688b1c86bef5455
        • MD5 SHA1 SHA512 SSDEEP

        is-5C2M6.tmp

        • Path C:\Users\Admin\AppData\Local\Temp\is-EPN6R.tmp\is-5C2M6.tmp
        • Size 723KB
        • SHA256 0290cf819c841a17d433eb1f768d2bad4ad57db003563a925688b1c86bef5455
        • MD5 SHA1 SHA512 SSDEEP

        RYJEQxj4zl6OH8.exe

        • Path C:\Users\Admin\AppData\Roaming\{846ee340-7039-11de-9d20-806e6f6e6963}\RYJEQxj4zl6OH8.exe
        • Size 72KB
        • SHA256 27ae813ceff8aa56e9fa68c8e50bb1c6c4a01636015eac4bd8bf444afb7020d6
        • MD5 SHA1 SHA512 SSDEEP

        RYJEQxj4zl6OH8.exe

        • Path C:\Users\Admin\AppData\Roaming\{846ee340-7039-11de-9d20-806e6f6e6963}\RYJEQxj4zl6OH8.exe
        • Size 72KB
        • SHA256 27ae813ceff8aa56e9fa68c8e50bb1c6c4a01636015eac4bd8bf444afb7020d6
        • MD5 SHA1 SHA512 SSDEEP

        SplitFiles117.exe

        • Path \Program Files (x86)\Split Files\SplitFiles117.exe
        • Size 3.4MB
        • SHA256 ec15ad327570e4fbe7871075765a25f9afff36d8763f2e4bd4c894c86b31e02b
        • MD5 SHA1 SHA512 SSDEEP

        SplitFiles117.exe

        • Path \Program Files (x86)\Split Files\SplitFiles117.exe
        • Size 3.4MB
        • SHA256 ec15ad327570e4fbe7871075765a25f9afff36d8763f2e4bd4c894c86b31e02b
        • MD5 SHA1 SHA512 SSDEEP

        SplitFiles117.exe

        • Path \Program Files (x86)\Split Files\SplitFiles117.exe
        • Size 3.4MB
        • SHA256 ec15ad327570e4fbe7871075765a25f9afff36d8763f2e4bd4c894c86b31e02b
        • MD5 SHA1 SHA512 SSDEEP

        is-5C2M6.tmp

        • Path \Users\Admin\AppData\Local\Temp\is-EPN6R.tmp\is-5C2M6.tmp
        • Size 723KB
        • SHA256 0290cf819c841a17d433eb1f768d2bad4ad57db003563a925688b1c86bef5455
        • MD5 SHA1 SHA512 SSDEEP

        _iscrypt.dll

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

        _shfoldr.dll

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

        _shfoldr.dll

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

        RYJEQxj4zl6OH8.exe

        • Path \Users\Admin\AppData\Roaming\{846ee340-7039-11de-9d20-806e6f6e6963}\RYJEQxj4zl6OH8.exe
        • Size 72KB
        • SHA256 27ae813ceff8aa56e9fa68c8e50bb1c6c4a01636015eac4bd8bf444afb7020d6
        • MD5 SHA1 SHA512 SSDEEP

        RYJEQxj4zl6OH8.exe

        • Path \Users\Admin\AppData\Roaming\{846ee340-7039-11de-9d20-806e6f6e6963}\RYJEQxj4zl6OH8.exe
        • Size 72KB
        • SHA256 27ae813ceff8aa56e9fa68c8e50bb1c6c4a01636015eac4bd8bf444afb7020d6
        • MD5 SHA1 SHA512 SSDEEP

        RYJEQxj4zl6OH8.exe

        • Path \Users\Admin\AppData\Roaming\{846ee340-7039-11de-9d20-806e6f6e6963}\RYJEQxj4zl6OH8.exe
        • Size 72KB
        • SHA256 27ae813ceff8aa56e9fa68c8e50bb1c6c4a01636015eac4bd8bf444afb7020d6
        • MD5 SHA1 SHA512 SSDEEP

        memory/1336-74-0x0000000000400000-0x0000000001560000-memory.dmp

        memory/1336-91-0x0000000000400000-0x0000000001560000-memory.dmp

        memory/1336-76-0x0000000001AF0000-0x0000000002C50000-memory.dmp

        memory/1336-77-0x0000000000400000-0x0000000001560000-memory.dmp

        memory/1336-78-0x0000000000400000-0x0000000001560000-memory.dmp

        memory/1336-95-0x0000000000400000-0x0000000001560000-memory.dmp

        memory/1336-75-0x0000000001AF0000-0x0000000002C50000-memory.dmp

        memory/1336-86-0x0000000010000000-0x000000001001B000-memory.dmp

        memory/1756-90-0x0000000003890000-0x00000000049F0000-memory.dmp

        memory/1756-73-0x0000000003890000-0x00000000049F0000-memory.dmp

        memory/1956-69-0x0000000000400000-0x0000000000427000-memory.dmp

        memory/1956-54-0x0000000075141000-0x0000000075143000-memory.dmp

        memory/1956-55-0x0000000000400000-0x0000000000427000-memory.dmp

        memory/1956-97-0x0000000000400000-0x0000000000427000-memory.dmp