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Analysis

  • max time kernel
    146s
  • max time network
    155s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20231020-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20231020-enlocale:en-usos:windows10-2004-x64system
  • submitted
    19/11/2023, 23:09

General

  • Target

    file.exe

  • Size

    269KB

  • MD5

    64d9eaeaa490b8129014dda174fecdd4

  • SHA1

    eb80c0e3a20600527bbe405f008d998de58e45b8

  • SHA256

    ca63ebea3ecd1099004b38c13cd7617ea556d18dadd749102b6e837cff9ebf0e

  • SHA512

    a53e24f8fcecff6668d43a55e277187d193a940f7c7274fa5263712d475e96399a484ca4148701379df33177efc2eeb9b5ea9f20d47ec67458ef7575f5f2d3ec

  • SSDEEP

    3072:dNsekaqWDp1O92TAAm7qMtUi22rRzAevI1M3KkfyBswJchRW0r7ovbeBV:wDa3LOI3i22Vzhf3Vq0PM

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 6 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:4564
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\fqcwyune\
      2⤵
        PID:2924
      • C:\Windows\SysWOW64\cmd.exe
        "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\ehexoqka.exe" C:\Windows\SysWOW64\fqcwyune\
        2⤵
          PID:4868
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" create fqcwyune binPath= "C:\Windows\SysWOW64\fqcwyune\ehexoqka.exe /d\"C:\Users\Admin\AppData\Local\Temp\file.exe\"" type= own start= auto DisplayName= "wifi support"
          2⤵
          • Launches sc.exe
          PID:2284
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" description fqcwyune "wifi internet conection"
          2⤵
          • Launches sc.exe
          PID:4420
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" start fqcwyune
          2⤵
          • Launches sc.exe
          PID:1476
        • 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:1444
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 4564 -s 896
          2⤵
          • Program crash
          PID:4176
      • C:\Windows\SysWOW64\fqcwyune\ehexoqka.exe
        C:\Windows\SysWOW64\fqcwyune\ehexoqka.exe /d"C:\Users\Admin\AppData\Local\Temp\file.exe"
        1⤵
        • Executes dropped EXE
        • Suspicious use of SetThreadContext
        • Suspicious use of WriteProcessMemory
        PID:3312
        • 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:1056
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 3312 -s 528
          2⤵
          • Program crash
          PID:4656
      • C:\Windows\SysWOW64\WerFault.exe
        C:\Windows\SysWOW64\WerFault.exe -pss -s 444 -p 4564 -ip 4564
        1⤵
          PID:1712
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -pss -s 448 -p 3312 -ip 3312
          1⤵
            PID:2428

          Network

          MITRE ATT&CK Enterprise v15

          Replay Monitor

          Loading Replay Monitor...

          Downloads

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

            Filesize

            12.0MB

            MD5

            a8599137f92db7dc124a7b9894cca0b0

            SHA1

            3d1f6706e73d65ae6a548c0ab1c544951cf8c6cc

            SHA256

            b47d8229b370ed5c2585c5daba94c9bbe28dae8c74cda17a49172c73403827ea

            SHA512

            ebb2525cc35a4b6590ed3750c6968f3a3083aceb3ac3048c9dd5d2c9eaa16f9c7a0f4736d86ee6f0f76ae9af61cdc16f68c478d6078a9ac2dca8597f67e143ec

          • C:\Windows\SysWOW64\fqcwyune\ehexoqka.exe

            Filesize

            12.0MB

            MD5

            a8599137f92db7dc124a7b9894cca0b0

            SHA1

            3d1f6706e73d65ae6a548c0ab1c544951cf8c6cc

            SHA256

            b47d8229b370ed5c2585c5daba94c9bbe28dae8c74cda17a49172c73403827ea

            SHA512

            ebb2525cc35a4b6590ed3750c6968f3a3083aceb3ac3048c9dd5d2c9eaa16f9c7a0f4736d86ee6f0f76ae9af61cdc16f68c478d6078a9ac2dca8597f67e143ec

          • memory/1056-32-0x00000000025E0000-0x00000000025F0000-memory.dmp

            Filesize

            64KB

          • memory/1056-33-0x00000000025E0000-0x00000000025F0000-memory.dmp

            Filesize

            64KB

          • memory/1056-58-0x0000000001260000-0x0000000001275000-memory.dmp

            Filesize

            84KB

          • memory/1056-54-0x00000000033D0000-0x00000000033D7000-memory.dmp

            Filesize

            28KB

          • memory/1056-53-0x0000000007E40000-0x000000000824B000-memory.dmp

            Filesize

            4.0MB

          • memory/1056-50-0x0000000007E40000-0x000000000824B000-memory.dmp

            Filesize

            4.0MB

          • memory/1056-49-0x00000000025F0000-0x00000000025F5000-memory.dmp

            Filesize

            20KB

          • memory/1056-12-0x0000000001260000-0x0000000001275000-memory.dmp

            Filesize

            84KB

          • memory/1056-15-0x0000000001260000-0x0000000001275000-memory.dmp

            Filesize

            84KB

          • memory/1056-34-0x00000000025E0000-0x00000000025F0000-memory.dmp

            Filesize

            64KB

          • memory/1056-17-0x0000000001260000-0x0000000001275000-memory.dmp

            Filesize

            84KB

          • memory/1056-19-0x0000000002E00000-0x000000000300F000-memory.dmp

            Filesize

            2.1MB

          • memory/1056-22-0x0000000002E00000-0x000000000300F000-memory.dmp

            Filesize

            2.1MB

          • memory/1056-23-0x00000000025D0000-0x00000000025D6000-memory.dmp

            Filesize

            24KB

          • memory/1056-26-0x00000000025E0000-0x00000000025F0000-memory.dmp

            Filesize

            64KB

          • memory/1056-29-0x00000000025E0000-0x00000000025F0000-memory.dmp

            Filesize

            64KB

          • memory/1056-30-0x00000000025E0000-0x00000000025F0000-memory.dmp

            Filesize

            64KB

          • memory/1056-31-0x00000000025E0000-0x00000000025F0000-memory.dmp

            Filesize

            64KB

          • memory/1056-46-0x00000000025F0000-0x00000000025F5000-memory.dmp

            Filesize

            20KB

          • memory/1056-45-0x00000000025E0000-0x00000000025F0000-memory.dmp

            Filesize

            64KB

          • memory/1056-44-0x00000000025E0000-0x00000000025F0000-memory.dmp

            Filesize

            64KB

          • memory/1056-35-0x00000000025E0000-0x00000000025F0000-memory.dmp

            Filesize

            64KB

          • memory/1056-36-0x00000000025E0000-0x00000000025F0000-memory.dmp

            Filesize

            64KB

          • memory/1056-37-0x00000000025E0000-0x00000000025F0000-memory.dmp

            Filesize

            64KB

          • memory/1056-38-0x00000000025E0000-0x00000000025F0000-memory.dmp

            Filesize

            64KB

          • memory/1056-39-0x00000000025E0000-0x00000000025F0000-memory.dmp

            Filesize

            64KB

          • memory/1056-40-0x00000000025E0000-0x00000000025F0000-memory.dmp

            Filesize

            64KB

          • memory/1056-41-0x00000000025E0000-0x00000000025F0000-memory.dmp

            Filesize

            64KB

          • memory/1056-42-0x00000000025E0000-0x00000000025F0000-memory.dmp

            Filesize

            64KB

          • memory/1056-43-0x00000000025E0000-0x00000000025F0000-memory.dmp

            Filesize

            64KB

          • memory/3312-16-0x0000000000400000-0x00000000004F7000-memory.dmp

            Filesize

            988KB

          • memory/3312-11-0x0000000000400000-0x00000000004F7000-memory.dmp

            Filesize

            988KB

          • memory/3312-10-0x0000000000540000-0x0000000000640000-memory.dmp

            Filesize

            1024KB

          • memory/4564-1-0x00000000006E0000-0x00000000007E0000-memory.dmp

            Filesize

            1024KB

          • memory/4564-3-0x0000000000400000-0x00000000004F7000-memory.dmp

            Filesize

            988KB

          • memory/4564-8-0x00000000006A0000-0x00000000006B3000-memory.dmp

            Filesize

            76KB

          • memory/4564-7-0x0000000000400000-0x00000000004F7000-memory.dmp

            Filesize

            988KB

          • memory/4564-2-0x00000000006A0000-0x00000000006B3000-memory.dmp

            Filesize

            76KB