Analysis

  • max time kernel
    149s
  • max time network
    151s
  • 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 13:19

General

  • Target

    755b1b45c26d282f094d504074bbdf897f6460968db67dd7d88a4702e03ef7f9.exe

  • Size

    203KB

  • MD5

    d88f7c78b3be6c96c33b80a8e1bb85de

  • SHA1

    ce07fb26b0ec69cdf563f98560aa4f7f298e6e8d

  • SHA256

    755b1b45c26d282f094d504074bbdf897f6460968db67dd7d88a4702e03ef7f9

  • SHA512

    1c396a26da383d01ddc317bc4c565c5825b0e452bcf262ac849cd720acb6cb7abcc08e895041e59246dd7686e72424990728745716815a5879bce30769e3e898

  • SSDEEP

    3072:Ef3B/ALaZdXUNc8iirJiM21K7uSbrF068c0E0rBNWRDxlH+cmH:Ef32clVO598c0EHxQco

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 7 IoCs
  • Suspicious use of WriteProcessMemory 23 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\755b1b45c26d282f094d504074bbdf897f6460968db67dd7d88a4702e03ef7f9.exe
    "C:\Users\Admin\AppData\Local\Temp\755b1b45c26d282f094d504074bbdf897f6460968db67dd7d88a4702e03ef7f9.exe"
    1⤵
    • Checks computer location settings
    • Suspicious use of WriteProcessMemory
    PID:3236
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\fxncaice\
      2⤵
        PID:1428
      • C:\Windows\SysWOW64\cmd.exe
        "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\zplavnlt.exe" C:\Windows\SysWOW64\fxncaice\
        2⤵
          PID:2200
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" create fxncaice binPath= "C:\Windows\SysWOW64\fxncaice\zplavnlt.exe /d\"C:\Users\Admin\AppData\Local\Temp\755b1b45c26d282f094d504074bbdf897f6460968db67dd7d88a4702e03ef7f9.exe\"" type= own start= auto DisplayName= "wifi support"
          2⤵
          • Launches sc.exe
          PID:4252
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" description fxncaice "wifi internet conection"
          2⤵
          • Launches sc.exe
          PID:4652
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" start fxncaice
          2⤵
          • Launches sc.exe
          PID:3028
        • 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:3624
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 3236 -s 660
          2⤵
          • Program crash
          PID:1672
      • C:\Windows\SysWOW64\fxncaice\zplavnlt.exe
        C:\Windows\SysWOW64\fxncaice\zplavnlt.exe /d"C:\Users\Admin\AppData\Local\Temp\755b1b45c26d282f094d504074bbdf897f6460968db67dd7d88a4702e03ef7f9.exe"
        1⤵
        • Executes dropped EXE
        • Suspicious use of SetThreadContext
        • Suspicious use of WriteProcessMemory
        PID:2952
        • 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:2092
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 2952 -s 532
          2⤵
          • Program crash
          PID:4752
      • C:\Windows\SysWOW64\WerFault.exe
        C:\Windows\SysWOW64\WerFault.exe -pss -s 444 -p 2952 -ip 2952
        1⤵
          PID:3668
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -pss -s 480 -p 3236 -ip 3236
          1⤵
            PID:880

          Network

          MITRE ATT&CK Enterprise v15

          Replay Monitor

          Loading Replay Monitor...

          Downloads

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

            Filesize

            12.9MB

            MD5

            036c0c97081a56cab3e217b3d01784c9

            SHA1

            99ac44377fafd9dd89a34557e0d081a4794ac4f9

            SHA256

            5f32e00b1ccf8c9a783b506f147b5efa03e78f61ab16bda3c757cd116be1301f

            SHA512

            3c5caca6affb29ea45c4cd62e2d691ebbcd63c26560e14d819fcc245ad9675ef274b4deae7db287286f3af7b39fef8185b22ad36e07fd2dccc8a4b2b4d9aa583

          • memory/2092-41-0x0000000001DD0000-0x0000000001DE0000-memory.dmp

            Filesize

            64KB

          • memory/2092-55-0x0000000002FE0000-0x0000000002FE7000-memory.dmp

            Filesize

            28KB

          • memory/2092-59-0x0000000000710000-0x0000000000725000-memory.dmp

            Filesize

            84KB

          • memory/2092-34-0x0000000001DD0000-0x0000000001DE0000-memory.dmp

            Filesize

            64KB

          • memory/2092-54-0x0000000007C80000-0x000000000808B000-memory.dmp

            Filesize

            4.0MB

          • memory/2092-51-0x0000000007C80000-0x000000000808B000-memory.dmp

            Filesize

            4.0MB

          • memory/2092-8-0x0000000000710000-0x0000000000725000-memory.dmp

            Filesize

            84KB

          • memory/2092-14-0x0000000000710000-0x0000000000725000-memory.dmp

            Filesize

            84KB

          • memory/2092-35-0x0000000001DD0000-0x0000000001DE0000-memory.dmp

            Filesize

            64KB

          • memory/2092-17-0x0000000000710000-0x0000000000725000-memory.dmp

            Filesize

            84KB

          • memory/2092-18-0x0000000000710000-0x0000000000725000-memory.dmp

            Filesize

            84KB

          • memory/2092-20-0x0000000002600000-0x000000000280F000-memory.dmp

            Filesize

            2.1MB

          • memory/2092-23-0x0000000002600000-0x000000000280F000-memory.dmp

            Filesize

            2.1MB

          • memory/2092-24-0x0000000001DC0000-0x0000000001DC6000-memory.dmp

            Filesize

            24KB

          • memory/2092-27-0x0000000001DD0000-0x0000000001DE0000-memory.dmp

            Filesize

            64KB

          • memory/2092-31-0x0000000001DD0000-0x0000000001DE0000-memory.dmp

            Filesize

            64KB

          • memory/2092-30-0x0000000001DD0000-0x0000000001DE0000-memory.dmp

            Filesize

            64KB

          • memory/2092-33-0x0000000001DD0000-0x0000000001DE0000-memory.dmp

            Filesize

            64KB

          • memory/2092-50-0x0000000002FD0000-0x0000000002FD5000-memory.dmp

            Filesize

            20KB

          • memory/2092-47-0x0000000002FD0000-0x0000000002FD5000-memory.dmp

            Filesize

            20KB

          • memory/2092-40-0x0000000001DD0000-0x0000000001DE0000-memory.dmp

            Filesize

            64KB

          • memory/2092-36-0x0000000001DD0000-0x0000000001DE0000-memory.dmp

            Filesize

            64KB

          • memory/2092-32-0x0000000001DD0000-0x0000000001DE0000-memory.dmp

            Filesize

            64KB

          • memory/2092-38-0x0000000001DD0000-0x0000000001DE0000-memory.dmp

            Filesize

            64KB

          • memory/2092-39-0x0000000001DD0000-0x0000000001DE0000-memory.dmp

            Filesize

            64KB

          • memory/2092-37-0x0000000001DD0000-0x0000000001DE0000-memory.dmp

            Filesize

            64KB

          • memory/2092-46-0x0000000001DD0000-0x0000000001DE0000-memory.dmp

            Filesize

            64KB

          • memory/2092-42-0x0000000001DD0000-0x0000000001DE0000-memory.dmp

            Filesize

            64KB

          • memory/2092-43-0x0000000001DD0000-0x0000000001DE0000-memory.dmp

            Filesize

            64KB

          • memory/2092-44-0x0000000001DD0000-0x0000000001DE0000-memory.dmp

            Filesize

            64KB

          • memory/2092-45-0x0000000001DD0000-0x0000000001DE0000-memory.dmp

            Filesize

            64KB

          • memory/2952-12-0x0000000000400000-0x0000000000438000-memory.dmp

            Filesize

            224KB

          • memory/2952-9-0x00000000005E0000-0x00000000006E0000-memory.dmp

            Filesize

            1024KB

          • memory/2952-10-0x00000000004C0000-0x00000000004D3000-memory.dmp

            Filesize

            76KB

          • memory/3236-1-0x0000000000530000-0x0000000000630000-memory.dmp

            Filesize

            1024KB

          • memory/3236-4-0x0000000000400000-0x0000000000438000-memory.dmp

            Filesize

            224KB

          • memory/3236-16-0x0000000000400000-0x0000000000438000-memory.dmp

            Filesize

            224KB

          • memory/3236-2-0x0000000002050000-0x0000000002063000-memory.dmp

            Filesize

            76KB