Analysis

  • max time kernel
    185s
  • max time network
    188s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20231025-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20231025-enlocale:en-usos:windows10-2004-x64system
  • submitted
    05/11/2023, 20:15

General

  • Target

    file.exe

  • Size

    262KB

  • MD5

    4eadd492253268de6bdf2244b965b9e2

  • SHA1

    31f93a90a4bc07cd6728016b7abebec3098a6267

  • SHA256

    8d07d9769a61406fae89642f8345914024d18ab303a6a47658d242273aafdd32

  • SHA512

    697c0754429342519c4d861901b75ef422a8992c6c66f2b17f90e9cd14815d17d61853043e11e36114b5a2da88ce1ce0c19cc43e7fcf6e5a623134ebe44c94d5

  • SSDEEP

    6144:Jz+obugLoTNsdkzpuD/7ictZiYLzQ3Xk0TRp:Fwg+NsdklYji4zQ3R

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.

  • Deletes itself 1 IoCs
  • 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\file.exe
    "C:\Users\Admin\AppData\Local\Temp\file.exe"
    1⤵
    • Checks computer location settings
    • Suspicious use of WriteProcessMemory
    PID:2800
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\ohiijevd\
      2⤵
        PID:5024
      • C:\Windows\SysWOW64\cmd.exe
        "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\zppmykay.exe" C:\Windows\SysWOW64\ohiijevd\
        2⤵
          PID:1736
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" create ohiijevd binPath= "C:\Windows\SysWOW64\ohiijevd\zppmykay.exe /d\"C:\Users\Admin\AppData\Local\Temp\file.exe\"" type= own start= auto DisplayName= "wifi support"
          2⤵
          • Launches sc.exe
          PID:1412
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" description ohiijevd "wifi internet conection"
          2⤵
          • Launches sc.exe
          PID:3972
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" start ohiijevd
          2⤵
          • Launches sc.exe
          PID:2532
        • 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:3492
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 2800 -s 1240
          2⤵
          • Program crash
          PID:1448
      • C:\Windows\SysWOW64\ohiijevd\zppmykay.exe
        C:\Windows\SysWOW64\ohiijevd\zppmykay.exe /d"C:\Users\Admin\AppData\Local\Temp\file.exe"
        1⤵
        • Executes dropped EXE
        • Suspicious use of SetThreadContext
        • Suspicious use of WriteProcessMemory
        PID:1144
        • C:\Windows\SysWOW64\svchost.exe
          svchost.exe
          2⤵
          • Sets service image path in registry
          • Deletes itself
          • Drops file in System32 directory
          • Modifies data under HKEY_USERS
          PID:2400
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 1144 -s 520
          2⤵
          • Program crash
          PID:2640
      • C:\Windows\SysWOW64\WerFault.exe
        C:\Windows\SysWOW64\WerFault.exe -pss -s 456 -p 2800 -ip 2800
        1⤵
          PID:552
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -pss -s 532 -p 1144 -ip 1144
          1⤵
            PID:1176

          Network

                MITRE ATT&CK Enterprise v15

                Replay Monitor

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                Downloads

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

                  Filesize

                  14.8MB

                  MD5

                  0b398bf59c85b311dc90e42a39d8c200

                  SHA1

                  f0fe7a2c5181d45d7e46bf70a1de64a503540542

                  SHA256

                  c2c75ee87cba83fa7a674f279db7a7768c963f30fb3e2f38e49cb3a2b5ae6007

                  SHA512

                  5dafc9ee16394515eeec12dc89d9739978054288f3c28846cc6eb539b60b39b5a8789c8dfe858eb210332db8d837a99f52ee3ef98f6ce49bd45d44d960b502c4

                • C:\Windows\SysWOW64\ohiijevd\zppmykay.exe

                  Filesize

                  14.8MB

                  MD5

                  0b398bf59c85b311dc90e42a39d8c200

                  SHA1

                  f0fe7a2c5181d45d7e46bf70a1de64a503540542

                  SHA256

                  c2c75ee87cba83fa7a674f279db7a7768c963f30fb3e2f38e49cb3a2b5ae6007

                  SHA512

                  5dafc9ee16394515eeec12dc89d9739978054288f3c28846cc6eb539b60b39b5a8789c8dfe858eb210332db8d837a99f52ee3ef98f6ce49bd45d44d960b502c4

                • memory/1144-8-0x0000000000BB0000-0x0000000000CB0000-memory.dmp

                  Filesize

                  1024KB

                • memory/1144-17-0x0000000000400000-0x00000000008A7000-memory.dmp

                  Filesize

                  4.7MB

                • memory/1144-10-0x0000000000400000-0x00000000008A7000-memory.dmp

                  Filesize

                  4.7MB

                • memory/2400-42-0x00000000025C0000-0x00000000025D0000-memory.dmp

                  Filesize

                  64KB

                • memory/2400-36-0x00000000025C0000-0x00000000025D0000-memory.dmp

                  Filesize

                  64KB

                • memory/2400-9-0x0000000001100000-0x0000000001115000-memory.dmp

                  Filesize

                  84KB

                • memory/2400-57-0x00000000031D0000-0x00000000031D7000-memory.dmp

                  Filesize

                  28KB

                • memory/2400-14-0x0000000001100000-0x0000000001115000-memory.dmp

                  Filesize

                  84KB

                • memory/2400-56-0x0000000007E40000-0x000000000824B000-memory.dmp

                  Filesize

                  4.0MB

                • memory/2400-53-0x0000000007E40000-0x000000000824B000-memory.dmp

                  Filesize

                  4.0MB

                • memory/2400-52-0x00000000025F0000-0x00000000025F5000-memory.dmp

                  Filesize

                  20KB

                • memory/2400-18-0x0000000001100000-0x0000000001115000-memory.dmp

                  Filesize

                  84KB

                • memory/2400-19-0x0000000001100000-0x0000000001115000-memory.dmp

                  Filesize

                  84KB

                • memory/2400-21-0x0000000001100000-0x0000000001115000-memory.dmp

                  Filesize

                  84KB

                • memory/2400-22-0x0000000002E00000-0x000000000300F000-memory.dmp

                  Filesize

                  2.1MB

                • memory/2400-25-0x0000000002E00000-0x000000000300F000-memory.dmp

                  Filesize

                  2.1MB

                • memory/2400-26-0x00000000025B0000-0x00000000025B6000-memory.dmp

                  Filesize

                  24KB

                • memory/2400-29-0x00000000025C0000-0x00000000025D0000-memory.dmp

                  Filesize

                  64KB

                • memory/2400-33-0x00000000025C0000-0x00000000025D0000-memory.dmp

                  Filesize

                  64KB

                • memory/2400-32-0x00000000025C0000-0x00000000025D0000-memory.dmp

                  Filesize

                  64KB

                • memory/2400-34-0x00000000025C0000-0x00000000025D0000-memory.dmp

                  Filesize

                  64KB

                • memory/2400-35-0x00000000025C0000-0x00000000025D0000-memory.dmp

                  Filesize

                  64KB

                • memory/2400-49-0x00000000025F0000-0x00000000025F5000-memory.dmp

                  Filesize

                  20KB

                • memory/2400-37-0x00000000025C0000-0x00000000025D0000-memory.dmp

                  Filesize

                  64KB

                • memory/2400-38-0x00000000025C0000-0x00000000025D0000-memory.dmp

                  Filesize

                  64KB

                • memory/2400-39-0x00000000025C0000-0x00000000025D0000-memory.dmp

                  Filesize

                  64KB

                • memory/2400-40-0x00000000025C0000-0x00000000025D0000-memory.dmp

                  Filesize

                  64KB

                • memory/2400-41-0x00000000025C0000-0x00000000025D0000-memory.dmp

                  Filesize

                  64KB

                • memory/2400-48-0x00000000025C0000-0x00000000025D0000-memory.dmp

                  Filesize

                  64KB

                • memory/2400-43-0x00000000025C0000-0x00000000025D0000-memory.dmp

                  Filesize

                  64KB

                • memory/2400-44-0x00000000025C0000-0x00000000025D0000-memory.dmp

                  Filesize

                  64KB

                • memory/2400-45-0x00000000025C0000-0x00000000025D0000-memory.dmp

                  Filesize

                  64KB

                • memory/2400-46-0x00000000025C0000-0x00000000025D0000-memory.dmp

                  Filesize

                  64KB

                • memory/2400-47-0x00000000025C0000-0x00000000025D0000-memory.dmp

                  Filesize

                  64KB

                • memory/2800-1-0x0000000000970000-0x0000000000A70000-memory.dmp

                  Filesize

                  1024KB

                • memory/2800-4-0x0000000000400000-0x00000000008A7000-memory.dmp

                  Filesize

                  4.7MB

                • memory/2800-2-0x00000000025F0000-0x0000000002603000-memory.dmp

                  Filesize

                  76KB

                • memory/2800-16-0x00000000025F0000-0x0000000002603000-memory.dmp

                  Filesize

                  76KB

                • memory/2800-15-0x0000000000400000-0x00000000008A7000-memory.dmp

                  Filesize

                  4.7MB

                • memory/2800-13-0x0000000000970000-0x0000000000A70000-memory.dmp

                  Filesize

                  1024KB