Analysis

  • max time kernel
    165s
  • max time network
    171s
  • 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, 07:28

General

  • Target

    file.exe

  • Size

    272KB

  • MD5

    9f0a410ccb387c123fd728599c357019

  • SHA1

    c33416439ef92df3607a0cddee7b7180a90d38d8

  • SHA256

    0e9c3ef019f7a75caaa05d3aa393475dc838172449260353e2f811b1da2b736e

  • SHA512

    4ccd16a4412cb5f29f4784d8ff58e25376788008d4643473812de9c75a6430e830e2261f9f3a0fcf2011aaf544cf1a8189a1a470419a1024565067523e241db5

  • SSDEEP

    3072:LVXuSjyqLgxnhwnBLF+ljgfLz86KsMAnRQ/HWhT5tFtFnU:tuS2qLsnhwBLF+lsXfKsMA+/Ho

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:1592
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\hwbkvhke\
      2⤵
        PID:1896
      • C:\Windows\SysWOW64\cmd.exe
        "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\ljygzpkg.exe" C:\Windows\SysWOW64\hwbkvhke\
        2⤵
          PID:1004
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" create hwbkvhke binPath= "C:\Windows\SysWOW64\hwbkvhke\ljygzpkg.exe /d\"C:\Users\Admin\AppData\Local\Temp\file.exe\"" type= own start= auto DisplayName= "wifi support"
          2⤵
          • Launches sc.exe
          PID:4408
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" description hwbkvhke "wifi internet conection"
          2⤵
          • Launches sc.exe
          PID:4044
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" start hwbkvhke
          2⤵
          • Launches sc.exe
          PID:2096
        • 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:4080
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 1592 -s 1044
          2⤵
          • Program crash
          PID:2012
      • C:\Windows\SysWOW64\hwbkvhke\ljygzpkg.exe
        C:\Windows\SysWOW64\hwbkvhke\ljygzpkg.exe /d"C:\Users\Admin\AppData\Local\Temp\file.exe"
        1⤵
        • Executes dropped EXE
        • Suspicious use of SetThreadContext
        • Suspicious use of WriteProcessMemory
        PID:2092
        • 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:796
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 2092 -s 520
          2⤵
          • Program crash
          PID:4908
      • C:\Windows\SysWOW64\WerFault.exe
        C:\Windows\SysWOW64\WerFault.exe -pss -s 468 -p 1592 -ip 1592
        1⤵
          PID:3424
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -pss -s 480 -p 2092 -ip 2092
          1⤵
            PID:3360

          Network

                MITRE ATT&CK Enterprise v15

                Replay Monitor

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                Downloads

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

                  Filesize

                  14.5MB

                  MD5

                  70159944a498c771e31a419ddfa23fbe

                  SHA1

                  89fce35e8e2b4adf0c5556741f3cb37398b890e8

                  SHA256

                  3ce2b973146f9efac4311c5a091c74465bb090e72b4150d3c3e542b5378db472

                  SHA512

                  66a64c4664a697b5065480973efeb611518aa78f6aa20e3cce8378a23c876700870a6ca7c4b310b87543226ab4bcc09696561a21207724a1dfa444c53d3cbda4

                • C:\Windows\SysWOW64\hwbkvhke\ljygzpkg.exe

                  Filesize

                  14.5MB

                  MD5

                  70159944a498c771e31a419ddfa23fbe

                  SHA1

                  89fce35e8e2b4adf0c5556741f3cb37398b890e8

                  SHA256

                  3ce2b973146f9efac4311c5a091c74465bb090e72b4150d3c3e542b5378db472

                  SHA512

                  66a64c4664a697b5065480973efeb611518aa78f6aa20e3cce8378a23c876700870a6ca7c4b310b87543226ab4bcc09696561a21207724a1dfa444c53d3cbda4

                • memory/796-33-0x00000000021D0000-0x00000000021E0000-memory.dmp

                  Filesize

                  64KB

                • memory/796-29-0x00000000021D0000-0x00000000021E0000-memory.dmp

                  Filesize

                  64KB

                • memory/796-57-0x00000000021F0000-0x00000000021F7000-memory.dmp

                  Filesize

                  28KB

                • memory/796-56-0x0000000007A00000-0x0000000007E0B000-memory.dmp

                  Filesize

                  4.0MB

                • memory/796-53-0x0000000007A00000-0x0000000007E0B000-memory.dmp

                  Filesize

                  4.0MB

                • memory/796-52-0x00000000021E0000-0x00000000021E5000-memory.dmp

                  Filesize

                  20KB

                • memory/796-49-0x00000000021E0000-0x00000000021E5000-memory.dmp

                  Filesize

                  20KB

                • memory/796-48-0x00000000021D0000-0x00000000021E0000-memory.dmp

                  Filesize

                  64KB

                • memory/796-13-0x0000000000E10000-0x0000000000E25000-memory.dmp

                  Filesize

                  84KB

                • memory/796-17-0x0000000000E10000-0x0000000000E25000-memory.dmp

                  Filesize

                  84KB

                • memory/796-18-0x0000000000E10000-0x0000000000E25000-memory.dmp

                  Filesize

                  84KB

                • memory/796-47-0x00000000021D0000-0x00000000021E0000-memory.dmp

                  Filesize

                  64KB

                • memory/796-21-0x0000000000E10000-0x0000000000E25000-memory.dmp

                  Filesize

                  84KB

                • memory/796-22-0x0000000002A00000-0x0000000002C0F000-memory.dmp

                  Filesize

                  2.1MB

                • memory/796-25-0x0000000002A00000-0x0000000002C0F000-memory.dmp

                  Filesize

                  2.1MB

                • memory/796-26-0x00000000021C0000-0x00000000021C6000-memory.dmp

                  Filesize

                  24KB

                • memory/796-32-0x00000000021D0000-0x00000000021E0000-memory.dmp

                  Filesize

                  64KB

                • memory/796-34-0x00000000021D0000-0x00000000021E0000-memory.dmp

                  Filesize

                  64KB

                • memory/796-46-0x00000000021D0000-0x00000000021E0000-memory.dmp

                  Filesize

                  64KB

                • memory/796-45-0x00000000021D0000-0x00000000021E0000-memory.dmp

                  Filesize

                  64KB

                • memory/796-38-0x00000000021D0000-0x00000000021E0000-memory.dmp

                  Filesize

                  64KB

                • memory/796-36-0x00000000021D0000-0x00000000021E0000-memory.dmp

                  Filesize

                  64KB

                • memory/796-37-0x00000000021D0000-0x00000000021E0000-memory.dmp

                  Filesize

                  64KB

                • memory/796-35-0x00000000021D0000-0x00000000021E0000-memory.dmp

                  Filesize

                  64KB

                • memory/796-39-0x00000000021D0000-0x00000000021E0000-memory.dmp

                  Filesize

                  64KB

                • memory/796-40-0x00000000021D0000-0x00000000021E0000-memory.dmp

                  Filesize

                  64KB

                • memory/796-41-0x00000000021D0000-0x00000000021E0000-memory.dmp

                  Filesize

                  64KB

                • memory/796-42-0x00000000021D0000-0x00000000021E0000-memory.dmp

                  Filesize

                  64KB

                • memory/796-43-0x00000000021D0000-0x00000000021E0000-memory.dmp

                  Filesize

                  64KB

                • memory/796-44-0x00000000021D0000-0x00000000021E0000-memory.dmp

                  Filesize

                  64KB

                • memory/1592-1-0x00000000006E0000-0x00000000007E0000-memory.dmp

                  Filesize

                  1024KB

                • memory/1592-3-0x0000000000400000-0x00000000004F7000-memory.dmp

                  Filesize

                  988KB

                • memory/1592-10-0x00000000006E0000-0x00000000007E0000-memory.dmp

                  Filesize

                  1024KB

                • memory/1592-9-0x00000000006A0000-0x00000000006B3000-memory.dmp

                  Filesize

                  76KB

                • memory/1592-8-0x0000000000400000-0x00000000004F7000-memory.dmp

                  Filesize

                  988KB

                • memory/1592-2-0x00000000006A0000-0x00000000006B3000-memory.dmp

                  Filesize

                  76KB

                • memory/2092-19-0x0000000000400000-0x00000000004F7000-memory.dmp

                  Filesize

                  988KB

                • memory/2092-12-0x0000000000400000-0x00000000004F7000-memory.dmp

                  Filesize

                  988KB

                • memory/2092-11-0x00000000005A0000-0x00000000006A0000-memory.dmp

                  Filesize

                  1024KB