Analysis

  • max time kernel
    138s
  • max time network
    152s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20220812-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20220812-enlocale:en-usos:windows10-2004-x64system
  • submitted
    03/10/2022, 07:37

General

  • Target
    file.exe
  • Size 220KB
  • Sample221003-jfs41sfadn
  • SHA256 5d59918ce4a82077f71fa248bf45aea8b1937adbbafd5cf0d1c518799007acfb
  • MD5 SHA1 SHA512 SSDEEP
Score
10/10

Malware Config

Extracted

Family
  • nymaim

C2
  • 208.67.104.97

  • 85.31.46.167

Signatures

  • NyMaim

    NyMaim is a malware with various capabilities written in C++ and first seen in 2013.

  • Downloads MZ/PE file
  • Executes dropped EXE 1 IoCs
  • Checks computer location settings 2 TTPs 1 IoCs

    Looks up country code configured in the registry, likely geofence.

  • Legitimate hosting services abused for malware hosting/C2 1 TTPs
  • AutoIT Executable 2 IoCs

    AutoIT scripts compiled to PE executables.

  • Enumerates physical storage devices 1 TTPs

    Attempts to interact with connected storage/optical drive(s). Likely ransomware behaviour.

  • Program crash 11 IoCs
  • Modifies system certificate store 2 TTPs 5 IoCs
  • Suspicious behavior: EnumeratesProcesses 6 IoCs
  • Suspicious behavior: GetForegroundWindowSpam 1 IoCs
  • Suspicious use of AdjustPrivilegeToken 1 IoCs
  • Suspicious use of WriteProcessMemory 5 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\file.exe
    "C:\Users\Admin\AppData\Local\Temp\file.exe"
    1⤵
    • Checks computer location settings
    • Suspicious behavior: EnumeratesProcesses
    • Suspicious behavior: GetForegroundWindowSpam
    • Suspicious use of WriteProcessMemory
    PID:2536
    • C:\Windows\SysWOW64\WerFault.exe
      C:\Windows\SysWOW64\WerFault.exe -u -p 2536 -s 456
      2⤵
      • Program crash
      PID:2392
    • C:\Windows\SysWOW64\WerFault.exe
      C:\Windows\SysWOW64\WerFault.exe -u -p 2536 -s 768
      2⤵
      • Program crash
      PID:1976
    • C:\Windows\SysWOW64\WerFault.exe
      C:\Windows\SysWOW64\WerFault.exe -u -p 2536 -s 808
      2⤵
      • Program crash
      PID:3624
    • C:\Windows\SysWOW64\WerFault.exe
      C:\Windows\SysWOW64\WerFault.exe -u -p 2536 -s 808
      2⤵
      • Program crash
      PID:2204
    • C:\Windows\SysWOW64\WerFault.exe
      C:\Windows\SysWOW64\WerFault.exe -u -p 2536 -s 860
      2⤵
      • Program crash
      PID:2808
    • C:\Windows\SysWOW64\WerFault.exe
      C:\Windows\SysWOW64\WerFault.exe -u -p 2536 -s 824
      2⤵
      • Program crash
      PID:4896
    • C:\Windows\SysWOW64\WerFault.exe
      C:\Windows\SysWOW64\WerFault.exe -u -p 2536 -s 1012
      2⤵
      • Program crash
      PID:1808
    • C:\Windows\SysWOW64\WerFault.exe
      C:\Windows\SysWOW64\WerFault.exe -u -p 2536 -s 844
      2⤵
      • Program crash
      PID:540
    • C:\Windows\SysWOW64\WerFault.exe
      C:\Windows\SysWOW64\WerFault.exe -u -p 2536 -s 1372
      2⤵
      • Program crash
      PID:1916
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /c start /I "" "C:\Users\Admin\AppData\Local\Temp\Cmj1gvpkq4Q1NRdlrLEzPN\Cleaner.exe"
      2⤵
      • Suspicious use of WriteProcessMemory
      PID:5112
      • C:\Users\Admin\AppData\Local\Temp\Cmj1gvpkq4Q1NRdlrLEzPN\Cleaner.exe
        "C:\Users\Admin\AppData\Local\Temp\Cmj1gvpkq4Q1NRdlrLEzPN\Cleaner.exe"
        3⤵
        • Executes dropped EXE
        • Modifies system certificate store
        • Suspicious use of AdjustPrivilegeToken
        PID:3528
        • C:\Windows\system32\WerFault.exe
          C:\Windows\system32\WerFault.exe -u -p 3528 -s 2280
          4⤵
          • Program crash
          PID:4200
    • C:\Windows\SysWOW64\WerFault.exe
      C:\Windows\SysWOW64\WerFault.exe -u -p 2536 -s 1388
      2⤵
      • Program crash
      PID:2152
  • C:\Windows\SysWOW64\WerFault.exe
    C:\Windows\SysWOW64\WerFault.exe -pss -s 404 -p 2536 -ip 2536
    1⤵
      PID:1608
    • C:\Windows\SysWOW64\WerFault.exe
      C:\Windows\SysWOW64\WerFault.exe -pss -s 452 -p 2536 -ip 2536
      1⤵
        PID:4852
      • C:\Windows\SysWOW64\WerFault.exe
        C:\Windows\SysWOW64\WerFault.exe -pss -s 416 -p 2536 -ip 2536
        1⤵
          PID:1156
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -pss -s 420 -p 2536 -ip 2536
          1⤵
            PID:3348
          • C:\Windows\SysWOW64\WerFault.exe
            C:\Windows\SysWOW64\WerFault.exe -pss -s 520 -p 2536 -ip 2536
            1⤵
              PID:1484
            • C:\Windows\SysWOW64\WerFault.exe
              C:\Windows\SysWOW64\WerFault.exe -pss -s 524 -p 2536 -ip 2536
              1⤵
                PID:4908
              • C:\Windows\SysWOW64\WerFault.exe
                C:\Windows\SysWOW64\WerFault.exe -pss -s 504 -p 2536 -ip 2536
                1⤵
                  PID:4784
                • C:\Windows\SysWOW64\WerFault.exe
                  C:\Windows\SysWOW64\WerFault.exe -pss -s 532 -p 2536 -ip 2536
                  1⤵
                    PID:4072
                  • C:\Windows\SysWOW64\WerFault.exe
                    C:\Windows\SysWOW64\WerFault.exe -pss -s 556 -p 2536 -ip 2536
                    1⤵
                      PID:1816
                    • C:\Windows\SysWOW64\WerFault.exe
                      C:\Windows\SysWOW64\WerFault.exe -pss -s 504 -p 2536 -ip 2536
                      1⤵
                        PID:2600
                      • C:\Windows\system32\WerFault.exe
                        C:\Windows\system32\WerFault.exe -pss -s 572 -p 3528 -ip 3528
                        1⤵
                          PID:4184

                        Network

                              MITRE ATT&CK Enterprise v6

                              Replay Monitor

                              Loading Replay Monitor...

                              Downloads

                              Bunifu_UI_v1.5.3.dll

                              • Path C:\Users\Admin\AppData\Local\Temp\Cmj1gvpkq4Q1NRdlrLEzPN\Bunifu_UI_v1.5.3.dll
                              • Size 236KB
                              • SHA256 f1b3e0f2750a9103e46a6a4a34f1cf9d17779725f98042cc2475ec66484801cf
                              • MD5 SHA1 SHA512 SSDEEP

                              Cleaner.exe

                              • Path C:\Users\Admin\AppData\Local\Temp\Cmj1gvpkq4Q1NRdlrLEzPN\Cleaner.exe
                              • Size 3.8MB
                              • SHA256 c394b068aa87264419f60838a8812b750e67cf93f2494c62b9078c3708072568
                              • MD5 SHA1 SHA512 SSDEEP

                              Cleaner.exe

                              • Path C:\Users\Admin\AppData\Local\Temp\Cmj1gvpkq4Q1NRdlrLEzPN\Cleaner.exe
                              • Size 3.8MB
                              • SHA256 c394b068aa87264419f60838a8812b750e67cf93f2494c62b9078c3708072568
                              • MD5 SHA1 SHA512 SSDEEP

                              memory/2536-132-0x000000000082D000-0x0000000000853000-memory.dmp

                              memory/2536-136-0x00000000022D0000-0x000000000230F000-memory.dmp

                              memory/2536-137-0x0000000000400000-0x0000000000594000-memory.dmp

                              memory/2536-134-0x0000000000400000-0x0000000000594000-memory.dmp

                              memory/2536-135-0x000000000082D000-0x0000000000853000-memory.dmp

                              memory/2536-133-0x00000000022D0000-0x000000000230F000-memory.dmp

                              memory/3528-143-0x00007FFA04DF0000-0x00007FFA058B1000-memory.dmp

                              memory/3528-142-0x00000147BEC90000-0x00000147BEDE6000-memory.dmp

                              memory/3528-145-0x00000147C0AF0000-0x00000147C0B32000-memory.dmp

                              memory/3528-146-0x00007FFA04DF0000-0x00007FFA058B1000-memory.dmp

                              memory/3528-147-0x00007FFA04DF0000-0x00007FFA058B1000-memory.dmp