Analysis

  • max time kernel
    149s
  • max time network
    158s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20230915-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20230915-enlocale:en-usos:windows10-2004-x64system
  • submitted
    06/10/2023, 14:01

General

  • Target

    NEAS.581b33f09c35d6df564be5836b7346a7adc7099c89e3dc7526c30aa8f0469e6aexe_JC.exe

  • Size

    195KB

  • MD5

    5c6683a06936a39749d7e6bcdf4b87a4

  • SHA1

    ee6bcde3f1f045f0d3575de986a25d02eabca68d

  • SHA256

    581b33f09c35d6df564be5836b7346a7adc7099c89e3dc7526c30aa8f0469e6a

  • SHA512

    bcb8537004a6b086bdaafd1b255ba58ccfa3c03cdb73b179718e58805e3321e5194225f0caa2ab4e76b19b9c736d261254a48fd1e497f96a5f4f41ef2be71ddc

  • SSDEEP

    3072:VUtu541Efd3mNsgTdd80wrQqH98Who5l:Wtu5pfd3maIGy

Malware Config

Extracted

Family

tofsee

C2

vanaheim.cn

jotunheim.name

Signatures

  • Tofsee

    Backdoor/botnet which carries out malicious activities based on commands from a C2 server.

  • Creates new service(s) 1 TTPs
  • Modifies Windows Firewall 1 TTPs 1 IoCs
  • Sets service image path in registry 2 TTPs 1 IoCs
  • Checks computer location settings 2 TTPs 1 IoCs

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

  • Executes dropped EXE 1 IoCs
  • Drops file in System32 directory 2 IoCs
  • Suspicious use of SetThreadContext 1 IoCs
  • Launches sc.exe 3 IoCs

    Sc.exe is a Windows utlilty to control services on the system.

  • Enumerates physical storage devices 1 TTPs

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

  • Program crash 2 IoCs
  • Modifies data under HKEY_USERS 7 IoCs
  • Suspicious use of WriteProcessMemory 23 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\NEAS.581b33f09c35d6df564be5836b7346a7adc7099c89e3dc7526c30aa8f0469e6aexe_JC.exe
    "C:\Users\Admin\AppData\Local\Temp\NEAS.581b33f09c35d6df564be5836b7346a7adc7099c89e3dc7526c30aa8f0469e6aexe_JC.exe"
    1⤵
    • Checks computer location settings
    • Suspicious use of WriteProcessMemory
    PID:1964
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\hlvkyava\
      2⤵
        PID:4304
      • C:\Windows\SysWOW64\cmd.exe
        "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\orohyauk.exe" C:\Windows\SysWOW64\hlvkyava\
        2⤵
          PID:4680
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" create hlvkyava binPath= "C:\Windows\SysWOW64\hlvkyava\orohyauk.exe /d\"C:\Users\Admin\AppData\Local\Temp\NEAS.581b33f09c35d6df564be5836b7346a7adc7099c89e3dc7526c30aa8f0469e6aexe_JC.exe\"" type= own start= auto DisplayName= "wifi support"
          2⤵
          • Launches sc.exe
          PID:696
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" description hlvkyava "wifi internet conection"
          2⤵
          • Launches sc.exe
          PID:4240
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" start hlvkyava
          2⤵
          • Launches sc.exe
          PID:2164
        • C:\Windows\SysWOW64\netsh.exe
          "C:\Windows\System32\netsh.exe" advfirewall firewall add rule name="Host-process for services of Windows" dir=in action=allow program="C:\Windows\SysWOW64\svchost.exe" enable=yes>nul
          2⤵
          • Modifies Windows Firewall
          PID:2196
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 1964 -s 668
          2⤵
          • Program crash
          PID:5020
      • C:\Windows\SysWOW64\hlvkyava\orohyauk.exe
        C:\Windows\SysWOW64\hlvkyava\orohyauk.exe /d"C:\Users\Admin\AppData\Local\Temp\NEAS.581b33f09c35d6df564be5836b7346a7adc7099c89e3dc7526c30aa8f0469e6aexe_JC.exe"
        1⤵
        • Executes dropped EXE
        • Suspicious use of SetThreadContext
        • Suspicious use of WriteProcessMemory
        PID:4408
        • C:\Windows\SysWOW64\svchost.exe
          svchost.exe
          2⤵
          • Sets service image path in registry
          • Drops file in System32 directory
          • Modifies data under HKEY_USERS
          PID:2324
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 4408 -s 368
          2⤵
          • Program crash
          PID:2484
      • C:\Windows\SysWOW64\WerFault.exe
        C:\Windows\SysWOW64\WerFault.exe -pss -s 460 -p 1964 -ip 1964
        1⤵
          PID:5028
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -pss -s 448 -p 4408 -ip 4408
          1⤵
            PID:3324

          Network

                MITRE ATT&CK Enterprise v15

                Replay Monitor

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                Downloads

                • C:\Users\Admin\AppData\Local\Temp\orohyauk.exe

                  Filesize

                  13.5MB

                  MD5

                  087c56ad7f7839241c2862e1675938cb

                  SHA1

                  b1a3bb42d7167f74a3a151c04cad755ffb1ac95c

                  SHA256

                  06a3507d7e187ce90421021ed20175477766d60a9d60a161c42b31998e5ba9d2

                  SHA512

                  19bcd2059c81d3918ba83162d9179016476f88052ec83303e24b673bd43a8495ac4c39ebba5e25ee9e315de505865ed491f96f7924059c3996b6c5a95712695f

                • C:\Windows\SysWOW64\hlvkyava\orohyauk.exe

                  Filesize

                  13.5MB

                  MD5

                  087c56ad7f7839241c2862e1675938cb

                  SHA1

                  b1a3bb42d7167f74a3a151c04cad755ffb1ac95c

                  SHA256

                  06a3507d7e187ce90421021ed20175477766d60a9d60a161c42b31998e5ba9d2

                  SHA512

                  19bcd2059c81d3918ba83162d9179016476f88052ec83303e24b673bd43a8495ac4c39ebba5e25ee9e315de505865ed491f96f7924059c3996b6c5a95712695f

                • memory/1964-1-0x00000000005B0000-0x00000000006B0000-memory.dmp

                  Filesize

                  1024KB

                • memory/1964-2-0x00000000022F0000-0x0000000002303000-memory.dmp

                  Filesize

                  76KB

                • memory/1964-3-0x0000000000400000-0x00000000005A8000-memory.dmp

                  Filesize

                  1.7MB

                • memory/1964-8-0x0000000000400000-0x00000000005A8000-memory.dmp

                  Filesize

                  1.7MB

                • memory/1964-10-0x00000000022F0000-0x0000000002303000-memory.dmp

                  Filesize

                  76KB

                • memory/2324-33-0x0000000001BE0000-0x0000000001BF0000-memory.dmp

                  Filesize

                  64KB

                • memory/2324-38-0x0000000001BE0000-0x0000000001BF0000-memory.dmp

                  Filesize

                  64KB

                • memory/2324-13-0x00000000005E0000-0x00000000005F5000-memory.dmp

                  Filesize

                  84KB

                • memory/2324-17-0x00000000005E0000-0x00000000005F5000-memory.dmp

                  Filesize

                  84KB

                • memory/2324-18-0x00000000005E0000-0x00000000005F5000-memory.dmp

                  Filesize

                  84KB

                • memory/2324-57-0x00000000029F0000-0x00000000029F7000-memory.dmp

                  Filesize

                  28KB

                • memory/2324-21-0x00000000005E0000-0x00000000005F5000-memory.dmp

                  Filesize

                  84KB

                • memory/2324-22-0x0000000002400000-0x000000000260F000-memory.dmp

                  Filesize

                  2.1MB

                • memory/2324-25-0x0000000002400000-0x000000000260F000-memory.dmp

                  Filesize

                  2.1MB

                • memory/2324-26-0x00000000009F0000-0x00000000009F6000-memory.dmp

                  Filesize

                  24KB

                • memory/2324-29-0x0000000001BE0000-0x0000000001BF0000-memory.dmp

                  Filesize

                  64KB

                • memory/2324-32-0x0000000001BE0000-0x0000000001BF0000-memory.dmp

                  Filesize

                  64KB

                • memory/2324-34-0x0000000001BE0000-0x0000000001BF0000-memory.dmp

                  Filesize

                  64KB

                • memory/2324-56-0x0000000007540000-0x000000000794B000-memory.dmp

                  Filesize

                  4.0MB

                • memory/2324-35-0x0000000001BE0000-0x0000000001BF0000-memory.dmp

                  Filesize

                  64KB

                • memory/2324-37-0x0000000001BE0000-0x0000000001BF0000-memory.dmp

                  Filesize

                  64KB

                • memory/2324-36-0x0000000001BE0000-0x0000000001BF0000-memory.dmp

                  Filesize

                  64KB

                • memory/2324-53-0x0000000007540000-0x000000000794B000-memory.dmp

                  Filesize

                  4.0MB

                • memory/2324-39-0x0000000001BE0000-0x0000000001BF0000-memory.dmp

                  Filesize

                  64KB

                • memory/2324-41-0x0000000001BE0000-0x0000000001BF0000-memory.dmp

                  Filesize

                  64KB

                • memory/2324-40-0x0000000001BE0000-0x0000000001BF0000-memory.dmp

                  Filesize

                  64KB

                • memory/2324-42-0x0000000001BE0000-0x0000000001BF0000-memory.dmp

                  Filesize

                  64KB

                • memory/2324-43-0x0000000001BE0000-0x0000000001BF0000-memory.dmp

                  Filesize

                  64KB

                • memory/2324-44-0x0000000001BE0000-0x0000000001BF0000-memory.dmp

                  Filesize

                  64KB

                • memory/2324-45-0x0000000001BE0000-0x0000000001BF0000-memory.dmp

                  Filesize

                  64KB

                • memory/2324-46-0x0000000001BE0000-0x0000000001BF0000-memory.dmp

                  Filesize

                  64KB

                • memory/2324-47-0x0000000001BE0000-0x0000000001BF0000-memory.dmp

                  Filesize

                  64KB

                • memory/2324-48-0x0000000001BE0000-0x0000000001BF0000-memory.dmp

                  Filesize

                  64KB

                • memory/2324-49-0x00000000029E0000-0x00000000029E5000-memory.dmp

                  Filesize

                  20KB

                • memory/2324-52-0x00000000029E0000-0x00000000029E5000-memory.dmp

                  Filesize

                  20KB

                • memory/4408-12-0x0000000000400000-0x00000000005A8000-memory.dmp

                  Filesize

                  1.7MB

                • memory/4408-11-0x00000000007B0000-0x00000000008B0000-memory.dmp

                  Filesize

                  1024KB

                • memory/4408-19-0x0000000000400000-0x00000000005A8000-memory.dmp

                  Filesize

                  1.7MB