Analysis

  • max time kernel
    63s
  • max time network
    64s
  • platform
    windows7_x64
  • resource
    win7-20220812-en
  • resource tags

    arch:x64arch:x86image:win7-20220812-enlocale:en-usos:windows7-x64system
  • submitted
    06/01/2023, 01:16

General

  • Target
    file.exe
  • Size 1.9MB
  • Sample230106-bmtecshd8x
  • SHA256 98cc016f7aaa1b5ece9265b613a7dcd56458b56dbc0bf5b1a52946fbfe0d0ef8
  • 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:536
    • C:\Users\Admin\AppData\Local\Temp\is-2K28O.tmp\is-DLCU4.tmp
      "C:\Users\Admin\AppData\Local\Temp\is-2K28O.tmp\is-DLCU4.tmp" /SL4 $60122 "C:\Users\Admin\AppData\Local\Temp\file.exe" 1692618 170496
      2⤵
      • Executes dropped EXE
      • Loads dropped DLL
      • Drops file in Program Files directory
      • Suspicious use of AdjustPrivilegeToken
      • Suspicious use of WriteProcessMemory
      PID:1724
      • C:\Program Files (x86)\Split Files\SplitFiles131.exe
        "C:\Program Files (x86)\Split Files\SplitFiles131.exe"
        3⤵
        • Executes dropped EXE
        • Loads dropped DLL
        • Suspicious behavior: EnumeratesProcesses
        • Suspicious use of WriteProcessMemory
        PID:960
        • C:\Users\Admin\AppData\Roaming\{846ee340-7039-11de-9d20-806e6f6e6963}\aadF7xIU.exe
          4⤵
          • Executes dropped EXE
          • Loads dropped DLL
          PID:1360
        • C:\Windows\SysWOW64\cmd.exe
          "C:\Windows\System32\cmd.exe" /c taskkill /im "SplitFiles131.exe" /f & erase "C:\Program Files (x86)\Split Files\SplitFiles131.exe" & exit
          4⤵
          • Suspicious use of WriteProcessMemory
          PID:700
          • C:\Windows\SysWOW64\taskkill.exe
            taskkill /im "SplitFiles131.exe" /f
            5⤵
            • Kills process with taskkill
            • Suspicious use of AdjustPrivilegeToken
            PID:844

Network

        MITRE ATT&CK Enterprise v6

        Replay Monitor

        Loading Replay Monitor...

        Downloads

        SplitFiles131.exe

        • Path C:\Program Files (x86)\Split Files\SplitFiles131.exe
        • Size 3.1MB
        • SHA256 4dabb6bd5a9aa9a24ccfa60108e8cbd3a9a6356a2f58aeae55e4b1cf6a5c9798
        • MD5 SHA1 SHA512 SSDEEP

        SplitFiles131.exe

        • Path C:\Program Files (x86)\Split Files\SplitFiles131.exe
        • Size 3.1MB
        • SHA256 4dabb6bd5a9aa9a24ccfa60108e8cbd3a9a6356a2f58aeae55e4b1cf6a5c9798
        • MD5 SHA1 SHA512 SSDEEP

        is-DLCU4.tmp

        • Path C:\Users\Admin\AppData\Local\Temp\is-2K28O.tmp\is-DLCU4.tmp
        • Size 760KB
        • SHA256 ab4fe42a7b708ddb648bb2088216ff47b877ae599fd52ff50359fc1db8e11ef7
        • MD5 SHA1 SHA512 SSDEEP

        is-DLCU4.tmp

        • Path C:\Users\Admin\AppData\Local\Temp\is-2K28O.tmp\is-DLCU4.tmp
        • Size 760KB
        • SHA256 ab4fe42a7b708ddb648bb2088216ff47b877ae599fd52ff50359fc1db8e11ef7
        • MD5 SHA1 SHA512 SSDEEP

        aadF7xIU.exe

        • Path C:\Users\Admin\AppData\Roaming\{846ee340-7039-11de-9d20-806e6f6e6963}\aadF7xIU.exe
        • Size 72KB
        • SHA256 27ae813ceff8aa56e9fa68c8e50bb1c6c4a01636015eac4bd8bf444afb7020d6
        • MD5 SHA1 SHA512 SSDEEP

        aadF7xIU.exe

        • Path C:\Users\Admin\AppData\Roaming\{846ee340-7039-11de-9d20-806e6f6e6963}\aadF7xIU.exe
        • Size 72KB
        • SHA256 27ae813ceff8aa56e9fa68c8e50bb1c6c4a01636015eac4bd8bf444afb7020d6
        • MD5 SHA1 SHA512 SSDEEP

        SplitFiles131.exe

        • Path \Program Files (x86)\Split Files\SplitFiles131.exe
        • Size 3.1MB
        • SHA256 4dabb6bd5a9aa9a24ccfa60108e8cbd3a9a6356a2f58aeae55e4b1cf6a5c9798
        • MD5 SHA1 SHA512 SSDEEP

        SplitFiles131.exe

        • Path \Program Files (x86)\Split Files\SplitFiles131.exe
        • Size 3.1MB
        • SHA256 4dabb6bd5a9aa9a24ccfa60108e8cbd3a9a6356a2f58aeae55e4b1cf6a5c9798
        • MD5 SHA1 SHA512 SSDEEP

        SplitFiles131.exe

        • Path \Program Files (x86)\Split Files\SplitFiles131.exe
        • Size 3.1MB
        • SHA256 4dabb6bd5a9aa9a24ccfa60108e8cbd3a9a6356a2f58aeae55e4b1cf6a5c9798
        • MD5 SHA1 SHA512 SSDEEP

        is-DLCU4.tmp

        • Path \Users\Admin\AppData\Local\Temp\is-2K28O.tmp\is-DLCU4.tmp
        • Size 760KB
        • SHA256 ab4fe42a7b708ddb648bb2088216ff47b877ae599fd52ff50359fc1db8e11ef7
        • MD5 SHA1 SHA512 SSDEEP

        _iscrypt.dll

        • Path \Users\Admin\AppData\Local\Temp\is-4UP1C.tmp\_iscrypt.dll
        • Size 2KB
        • SHA256 2f6294f9aa09f59a574b5dcd33be54e16b39377984f3d5658cda44950fa0f8fc
        • MD5 SHA1 SHA512

        _shfoldr.dll

        • Path \Users\Admin\AppData\Local\Temp\is-4UP1C.tmp\_isetup\_shfoldr.dll
        • Size 22KB
        • SHA256 9884e9d1b4f8a873ccbd81f8ad0ae257776d2348d027d811a56475e028360d87
        • MD5 SHA1 SHA512 SSDEEP

        _shfoldr.dll

        • Path \Users\Admin\AppData\Local\Temp\is-4UP1C.tmp\_isetup\_shfoldr.dll
        • Size 22KB
        • SHA256 9884e9d1b4f8a873ccbd81f8ad0ae257776d2348d027d811a56475e028360d87
        • MD5 SHA1 SHA512 SSDEEP

        aadF7xIU.exe

        • Path \Users\Admin\AppData\Roaming\{846ee340-7039-11de-9d20-806e6f6e6963}\aadF7xIU.exe
        • Size 72KB
        • SHA256 27ae813ceff8aa56e9fa68c8e50bb1c6c4a01636015eac4bd8bf444afb7020d6
        • MD5 SHA1 SHA512 SSDEEP

        aadF7xIU.exe

        • Path \Users\Admin\AppData\Roaming\{846ee340-7039-11de-9d20-806e6f6e6963}\aadF7xIU.exe
        • Size 72KB
        • SHA256 27ae813ceff8aa56e9fa68c8e50bb1c6c4a01636015eac4bd8bf444afb7020d6
        • MD5 SHA1 SHA512 SSDEEP

        aadF7xIU.exe

        • Path \Users\Admin\AppData\Roaming\{846ee340-7039-11de-9d20-806e6f6e6963}\aadF7xIU.exe
        • Size 72KB
        • SHA256 27ae813ceff8aa56e9fa68c8e50bb1c6c4a01636015eac4bd8bf444afb7020d6
        • MD5 SHA1 SHA512 SSDEEP

        memory/536-69-0x0000000000400000-0x0000000000430000-memory.dmp

        memory/536-100-0x0000000000400000-0x0000000000430000-memory.dmp

        memory/536-54-0x0000000075B11000-0x0000000075B13000-memory.dmp

        memory/536-55-0x0000000000400000-0x0000000000430000-memory.dmp

        memory/960-78-0x0000000000400000-0x0000000001526000-memory.dmp

        memory/960-89-0x0000000010000000-0x000000001001B000-memory.dmp

        memory/960-74-0x0000000000400000-0x0000000001526000-memory.dmp

        memory/960-75-0x0000000002080000-0x00000000031A6000-memory.dmp

        memory/960-77-0x0000000000400000-0x0000000001526000-memory.dmp

        memory/960-98-0x0000000000400000-0x0000000001526000-memory.dmp

        memory/960-87-0x0000000000400000-0x0000000001526000-memory.dmp

        memory/960-88-0x0000000002080000-0x00000000031A6000-memory.dmp

        memory/960-90-0x0000000002080000-0x00000000031A6000-memory.dmp

        memory/960-76-0x0000000002080000-0x00000000031A6000-memory.dmp

        memory/960-94-0x0000000000400000-0x0000000001526000-memory.dmp

        memory/1724-86-0x0000000003980000-0x0000000004AA6000-memory.dmp

        memory/1724-73-0x0000000003980000-0x0000000004AA6000-memory.dmp