Analysis

  • max time kernel
    148s
  • max time network
    137s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20240412-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20240412-enlocale:en-usos:windows10-2004-x64system
  • submitted
    17-04-2024 13:33

General

  • Target

    900f15042c99288aef15c9187640b625ffec568147dd761f1508e9b61cc174d7.exe

  • Size

    204KB

  • MD5

    1f57a9bb99804b8193ef503404bb7387

  • SHA1

    674710911110b4b45030b990dabb3c45fd095b3f

  • SHA256

    900f15042c99288aef15c9187640b625ffec568147dd761f1508e9b61cc174d7

  • SHA512

    d93b6d24f3fdb267a0d43195bbba3494cb2734756e5e3090cea9e65c584d66ca5eb1842bda274f484a42dac89f2fb196a2ef83e9f8e70dad4ca4b1351c3acce7

  • SSDEEP

    3072:qfrB/GLaZdXUNc8iirJiM21K7uu+5Oiq08tJz5zoy887jImQpeBNMRDx/+cmH:qfrwclVORxv5z8kI1x2co

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 2 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 3 IoCs
  • Suspicious use of WriteProcessMemory 23 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\900f15042c99288aef15c9187640b625ffec568147dd761f1508e9b61cc174d7.exe
    "C:\Users\Admin\AppData\Local\Temp\900f15042c99288aef15c9187640b625ffec568147dd761f1508e9b61cc174d7.exe"
    1⤵
    • Checks computer location settings
    • Suspicious use of WriteProcessMemory
    PID:4012
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\eitcryoy\
      2⤵
        PID:2324
      • C:\Windows\SysWOW64\cmd.exe
        "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\dxcavyvx.exe" C:\Windows\SysWOW64\eitcryoy\
        2⤵
          PID:3640
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" create eitcryoy binPath= "C:\Windows\SysWOW64\eitcryoy\dxcavyvx.exe /d\"C:\Users\Admin\AppData\Local\Temp\900f15042c99288aef15c9187640b625ffec568147dd761f1508e9b61cc174d7.exe\"" type= own start= auto DisplayName= "wifi support"
          2⤵
          • Launches sc.exe
          PID:400
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" description eitcryoy "wifi internet conection"
          2⤵
          • Launches sc.exe
          PID:2116
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" start eitcryoy
          2⤵
          • Launches sc.exe
          PID:4116
        • 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:1944
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 4012 -s 592
          2⤵
          • Program crash
          PID:2620
      • C:\Windows\SysWOW64\eitcryoy\dxcavyvx.exe
        C:\Windows\SysWOW64\eitcryoy\dxcavyvx.exe /d"C:\Users\Admin\AppData\Local\Temp\900f15042c99288aef15c9187640b625ffec568147dd761f1508e9b61cc174d7.exe"
        1⤵
        • Executes dropped EXE
        • Suspicious use of SetThreadContext
        • Suspicious use of WriteProcessMemory
        PID:812
        • 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:1628
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 812 -s 532
          2⤵
          • Program crash
          PID:60
      • C:\Windows\SysWOW64\WerFault.exe
        C:\Windows\SysWOW64\WerFault.exe -pss -s 472 -p 4012 -ip 4012
        1⤵
          PID:5000
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -pss -s 448 -p 812 -ip 812
          1⤵
            PID:4744

          Network

          MITRE ATT&CK Enterprise v15

          Replay Monitor

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          Downloads

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

            Filesize

            14.1MB

            MD5

            84d95b9112513a10ef802c6a98fc1e43

            SHA1

            02f7649be17c2fbba0c040d223084450b461f16b

            SHA256

            e79b3a6bbb93675f89b7b3783b770c1e76f7712ea9babc637480bfe33b20c635

            SHA512

            6a6b49a38cb9685c312218df49d54ab2177a1118842d59f16f4974357085540ba86b32419adc5648b62937cd32c6e559defe2b2a76c48ecc211f76a4f7da7edd

          • memory/812-10-0x0000000000400000-0x0000000000438000-memory.dmp

            Filesize

            224KB

          • memory/812-8-0x0000000000460000-0x0000000000560000-memory.dmp

            Filesize

            1024KB

          • memory/812-9-0x0000000000D00000-0x0000000000D13000-memory.dmp

            Filesize

            76KB

          • memory/812-15-0x0000000000400000-0x0000000000438000-memory.dmp

            Filesize

            224KB

          • memory/1628-11-0x0000000000360000-0x0000000000375000-memory.dmp

            Filesize

            84KB

          • memory/1628-14-0x0000000000360000-0x0000000000375000-memory.dmp

            Filesize

            84KB

          • memory/1628-17-0x0000000000360000-0x0000000000375000-memory.dmp

            Filesize

            84KB

          • memory/1628-18-0x0000000000360000-0x0000000000375000-memory.dmp

            Filesize

            84KB

          • memory/1628-20-0x0000000000360000-0x0000000000375000-memory.dmp

            Filesize

            84KB

          • memory/4012-3-0x0000000000400000-0x0000000000438000-memory.dmp

            Filesize

            224KB

          • memory/4012-2-0x0000000002190000-0x00000000021A3000-memory.dmp

            Filesize

            76KB

          • memory/4012-1-0x00000000005F0000-0x00000000006F0000-memory.dmp

            Filesize

            1024KB

          • memory/4012-16-0x0000000000400000-0x0000000000438000-memory.dmp

            Filesize

            224KB