Analysis

  • max time kernel
    165s
  • max time network
    172s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20231020-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20231020-enlocale:en-usos:windows10-2004-x64system
  • submitted
    05/11/2023, 00:23

General

  • Target

    file.exe

  • Size

    251KB

  • MD5

    3289ff07ba3c5b4ea9614f862dae3bd8

  • SHA1

    30b15edf7ad3f7bc059f58436198d5619f06a53a

  • SHA256

    c93020e01233f2935a6fba66fa3e3ccc38b0fc50bacd0a374c1130910f821935

  • SHA512

    9e90abf93b6e7268a0c8993c864d9b106c00990f77c1d8011ea7325a0467332f508f04dc083c46880dea9a71a9a6fbf6c8bdcec83b310093eea0c455c66e5a82

  • SSDEEP

    3072:7RoP5wl8uJh5E7jjzFApPWASdKogJodIj+5JjAxSdhee3hUDxy/Ocat:toWlbhOTFApPmdKogJc5JMxUh7OQG

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:2760
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\iimwtqgw\
      2⤵
        PID:1372
      • C:\Windows\SysWOW64\cmd.exe
        "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\elsvkyrb.exe" C:\Windows\SysWOW64\iimwtqgw\
        2⤵
          PID:4144
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" create iimwtqgw binPath= "C:\Windows\SysWOW64\iimwtqgw\elsvkyrb.exe /d\"C:\Users\Admin\AppData\Local\Temp\file.exe\"" type= own start= auto DisplayName= "wifi support"
          2⤵
          • Launches sc.exe
          PID:2868
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" description iimwtqgw "wifi internet conection"
          2⤵
          • Launches sc.exe
          PID:3824
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" start iimwtqgw
          2⤵
          • Launches sc.exe
          PID:3544
        • 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:1668
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 2760 -s 1216
          2⤵
          • Program crash
          PID:736
      • C:\Windows\SysWOW64\WerFault.exe
        C:\Windows\SysWOW64\WerFault.exe -pss -s 484 -p 2760 -ip 2760
        1⤵
          PID:4160
        • C:\Windows\SysWOW64\iimwtqgw\elsvkyrb.exe
          C:\Windows\SysWOW64\iimwtqgw\elsvkyrb.exe /d"C:\Users\Admin\AppData\Local\Temp\file.exe"
          1⤵
          • Executes dropped EXE
          • Suspicious use of SetThreadContext
          • Suspicious use of WriteProcessMemory
          PID:2944
          • 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:4788
          • C:\Windows\SysWOW64\WerFault.exe
            C:\Windows\SysWOW64\WerFault.exe -u -p 2944 -s 512
            2⤵
            • Program crash
            PID:1476
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -pss -s 540 -p 2944 -ip 2944
          1⤵
            PID:1748

          Network

                MITRE ATT&CK Enterprise v15

                Replay Monitor

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                Downloads

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

                  Filesize

                  10.4MB

                  MD5

                  840e1a4d0ff4afa8a5944f68ce934daf

                  SHA1

                  21012240b1c6e168776bdbcb8ab901124bfaf7cc

                  SHA256

                  6d4bd2a7114b9316d2dfd0797b8b98708343c2dc676432a232a0931bf2138c97

                  SHA512

                  36a8d4571d861e56baca52c2dc5aae19fc936b08f8849ad0e0f988f50e1a3241003c66c6f6814e9341b0c3e0c7e55e25896886a2968578092356a75657efe0ca

                • C:\Windows\SysWOW64\iimwtqgw\elsvkyrb.exe

                  Filesize

                  10.4MB

                  MD5

                  840e1a4d0ff4afa8a5944f68ce934daf

                  SHA1

                  21012240b1c6e168776bdbcb8ab901124bfaf7cc

                  SHA256

                  6d4bd2a7114b9316d2dfd0797b8b98708343c2dc676432a232a0931bf2138c97

                  SHA512

                  36a8d4571d861e56baca52c2dc5aae19fc936b08f8849ad0e0f988f50e1a3241003c66c6f6814e9341b0c3e0c7e55e25896886a2968578092356a75657efe0ca

                • memory/2760-2-0x0000000002510000-0x0000000002523000-memory.dmp

                  Filesize

                  76KB

                • memory/2760-4-0x0000000000400000-0x00000000007C8000-memory.dmp

                  Filesize

                  3.8MB

                • memory/2760-5-0x0000000000400000-0x00000000007C8000-memory.dmp

                  Filesize

                  3.8MB

                • memory/2760-6-0x00000000009C0000-0x0000000000AC0000-memory.dmp

                  Filesize

                  1024KB

                • memory/2760-7-0x0000000002510000-0x0000000002523000-memory.dmp

                  Filesize

                  76KB

                • memory/2760-11-0x0000000000400000-0x00000000007C8000-memory.dmp

                  Filesize

                  3.8MB

                • memory/2760-1-0x00000000009C0000-0x0000000000AC0000-memory.dmp

                  Filesize

                  1024KB

                • memory/2944-21-0x0000000000400000-0x00000000007C8000-memory.dmp

                  Filesize

                  3.8MB

                • memory/2944-13-0x0000000000A20000-0x0000000000B20000-memory.dmp

                  Filesize

                  1024KB

                • memory/2944-14-0x0000000000400000-0x00000000007C8000-memory.dmp

                  Filesize

                  3.8MB

                • memory/4788-35-0x0000000001D80000-0x0000000001D90000-memory.dmp

                  Filesize

                  64KB

                • memory/4788-40-0x0000000001D80000-0x0000000001D90000-memory.dmp

                  Filesize

                  64KB

                • memory/4788-20-0x00000000007B0000-0x00000000007C5000-memory.dmp

                  Filesize

                  84KB

                • memory/4788-23-0x00000000007B0000-0x00000000007C5000-memory.dmp

                  Filesize

                  84KB

                • memory/4788-24-0x0000000002600000-0x000000000280F000-memory.dmp

                  Filesize

                  2.1MB

                • memory/4788-27-0x0000000002600000-0x000000000280F000-memory.dmp

                  Filesize

                  2.1MB

                • memory/4788-28-0x00000000009F0000-0x00000000009F6000-memory.dmp

                  Filesize

                  24KB

                • memory/4788-31-0x0000000001D80000-0x0000000001D90000-memory.dmp

                  Filesize

                  64KB

                • memory/4788-15-0x00000000007B0000-0x00000000007C5000-memory.dmp

                  Filesize

                  84KB

                • memory/4788-36-0x0000000001D80000-0x0000000001D90000-memory.dmp

                  Filesize

                  64KB

                • memory/4788-37-0x0000000001D80000-0x0000000001D90000-memory.dmp

                  Filesize

                  64KB

                • memory/4788-34-0x0000000001D80000-0x0000000001D90000-memory.dmp

                  Filesize

                  64KB

                • memory/4788-39-0x0000000001D80000-0x0000000001D90000-memory.dmp

                  Filesize

                  64KB

                • memory/4788-38-0x0000000001D80000-0x0000000001D90000-memory.dmp

                  Filesize

                  64KB

                • memory/4788-41-0x0000000001D80000-0x0000000001D90000-memory.dmp

                  Filesize

                  64KB

                • memory/4788-19-0x00000000007B0000-0x00000000007C5000-memory.dmp

                  Filesize

                  84KB

                • memory/4788-42-0x0000000001D80000-0x0000000001D90000-memory.dmp

                  Filesize

                  64KB

                • memory/4788-43-0x0000000001D80000-0x0000000001D90000-memory.dmp

                  Filesize

                  64KB

                • memory/4788-44-0x0000000001D80000-0x0000000001D90000-memory.dmp

                  Filesize

                  64KB

                • memory/4788-45-0x0000000001D80000-0x0000000001D90000-memory.dmp

                  Filesize

                  64KB

                • memory/4788-46-0x0000000001D80000-0x0000000001D90000-memory.dmp

                  Filesize

                  64KB

                • memory/4788-47-0x0000000001D80000-0x0000000001D90000-memory.dmp

                  Filesize

                  64KB

                • memory/4788-48-0x0000000001D80000-0x0000000001D90000-memory.dmp

                  Filesize

                  64KB

                • memory/4788-49-0x0000000001D80000-0x0000000001D90000-memory.dmp

                  Filesize

                  64KB

                • memory/4788-50-0x0000000001D80000-0x0000000001D90000-memory.dmp

                  Filesize

                  64KB

                • memory/4788-51-0x0000000001DD0000-0x0000000001DD5000-memory.dmp

                  Filesize

                  20KB

                • memory/4788-54-0x0000000001DD0000-0x0000000001DD5000-memory.dmp

                  Filesize

                  20KB

                • memory/4788-55-0x0000000007600000-0x0000000007A0B000-memory.dmp

                  Filesize

                  4.0MB

                • memory/4788-58-0x0000000007600000-0x0000000007A0B000-memory.dmp

                  Filesize

                  4.0MB

                • memory/4788-59-0x0000000001DE0000-0x0000000001DE7000-memory.dmp

                  Filesize

                  28KB