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Analysis

  • max time kernel
    147s
  • max time network
    157s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20230915-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20230915-enlocale:en-usos:windows10-2004-x64system
  • submitted
    13/10/2023, 03:54

General

  • Target

    file.exe

  • Size

    272KB

  • MD5

    fd228d66dacf3a914214e849dcf19979

  • SHA1

    6aabf3300d2ab321ea51af659fd1c6a56ce2f236

  • SHA256

    10ec03f362b7385e68ee249d402663469b8b613dd32961bc38c7c5cd3c4b44b9

  • SHA512

    f705c41bc1281b8a57d7f6a19446c8705c85e4af9e6c32ad2686d2cfa0ddd563df6f630b262e1a72422d32af1a4a77050d752f8f06d0be5ed2894cbd61d3dfe8

  • SSDEEP

    3072:F8KnEMUvutnG3L6PG4dM2gbDNCbNCpvDi4xSpv3NY:aKAvutnG3L6PVdENCpMu4xSw

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:2020
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\wjjkizor\
      2⤵
        PID:3608
      • C:\Windows\SysWOW64\cmd.exe
        "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\euurdpfd.exe" C:\Windows\SysWOW64\wjjkizor\
        2⤵
          PID:3320
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" create wjjkizor binPath= "C:\Windows\SysWOW64\wjjkizor\euurdpfd.exe /d\"C:\Users\Admin\AppData\Local\Temp\file.exe\"" type= own start= auto DisplayName= "wifi support"
          2⤵
          • Launches sc.exe
          PID:2184
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" description wjjkizor "wifi internet conection"
          2⤵
          • Launches sc.exe
          PID:4856
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" start wjjkizor
          2⤵
          • Launches sc.exe
          PID:2336
        • 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:4160
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 2020 -s 1044
          2⤵
          • Program crash
          PID:1064
      • C:\Windows\SysWOW64\wjjkizor\euurdpfd.exe
        C:\Windows\SysWOW64\wjjkizor\euurdpfd.exe /d"C:\Users\Admin\AppData\Local\Temp\file.exe"
        1⤵
        • Executes dropped EXE
        • Suspicious use of SetThreadContext
        • Suspicious use of WriteProcessMemory
        PID:1396
        • 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:4780
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 1396 -s 544
          2⤵
          • Program crash
          PID:3396
      • C:\Windows\SysWOW64\WerFault.exe
        C:\Windows\SysWOW64\WerFault.exe -pss -s 420 -p 2020 -ip 2020
        1⤵
          PID:2588
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -pss -s 440 -p 1396 -ip 1396
          1⤵
            PID:1820

          Network

          MITRE ATT&CK Enterprise v15

          Replay Monitor

          Loading Replay Monitor...

          Downloads

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

            Filesize

            10.1MB

            MD5

            b2b5e6fda122fbcefa9d916e8014e26e

            SHA1

            9baa669fd80ba05c1e0cb9b90cf7fd2720c1e771

            SHA256

            8aece17771610fa7ebd03fd47437da537a2055d2f2a71a66a31bf8b13de0ebed

            SHA512

            6ebbb21dab9578ff650ef4711c4c1a74d6d9498ba9f65a4fcdbdf3d827b5719c66fb85338285a4358fa348fe3ee0a9a23c403e9788b59dc08f584d0329244fb0

          • C:\Windows\SysWOW64\wjjkizor\euurdpfd.exe

            Filesize

            10.1MB

            MD5

            b2b5e6fda122fbcefa9d916e8014e26e

            SHA1

            9baa669fd80ba05c1e0cb9b90cf7fd2720c1e771

            SHA256

            8aece17771610fa7ebd03fd47437da537a2055d2f2a71a66a31bf8b13de0ebed

            SHA512

            6ebbb21dab9578ff650ef4711c4c1a74d6d9498ba9f65a4fcdbdf3d827b5719c66fb85338285a4358fa348fe3ee0a9a23c403e9788b59dc08f584d0329244fb0

          • memory/1396-18-0x0000000000400000-0x0000000000712000-memory.dmp

            Filesize

            3.1MB

          • memory/1396-10-0x00000000008B0000-0x00000000009B0000-memory.dmp

            Filesize

            1024KB

          • memory/1396-11-0x0000000000890000-0x00000000008A3000-memory.dmp

            Filesize

            76KB

          • memory/1396-12-0x0000000000400000-0x0000000000712000-memory.dmp

            Filesize

            3.1MB

          • memory/2020-2-0x00000000009C0000-0x00000000009D3000-memory.dmp

            Filesize

            76KB

          • memory/2020-3-0x0000000000400000-0x0000000000712000-memory.dmp

            Filesize

            3.1MB

          • memory/2020-7-0x0000000000400000-0x0000000000712000-memory.dmp

            Filesize

            3.1MB

          • memory/2020-8-0x00000000009C0000-0x00000000009D3000-memory.dmp

            Filesize

            76KB

          • memory/2020-1-0x0000000000A10000-0x0000000000B10000-memory.dmp

            Filesize

            1024KB

          • memory/4780-32-0x0000000001F50000-0x0000000001F60000-memory.dmp

            Filesize

            64KB

          • memory/4780-40-0x0000000001F50000-0x0000000001F60000-memory.dmp

            Filesize

            64KB

          • memory/4780-19-0x0000000000980000-0x0000000000995000-memory.dmp

            Filesize

            84KB

          • memory/4780-21-0x0000000000980000-0x0000000000995000-memory.dmp

            Filesize

            84KB

          • memory/4780-22-0x0000000002800000-0x0000000002A0F000-memory.dmp

            Filesize

            2.1MB

          • memory/4780-25-0x0000000002800000-0x0000000002A0F000-memory.dmp

            Filesize

            2.1MB

          • memory/4780-26-0x0000000001F40000-0x0000000001F46000-memory.dmp

            Filesize

            24KB

          • memory/4780-29-0x0000000001F50000-0x0000000001F60000-memory.dmp

            Filesize

            64KB

          • memory/4780-33-0x0000000001F50000-0x0000000001F60000-memory.dmp

            Filesize

            64KB

          • memory/4780-13-0x0000000000980000-0x0000000000995000-memory.dmp

            Filesize

            84KB

          • memory/4780-34-0x0000000001F50000-0x0000000001F60000-memory.dmp

            Filesize

            64KB

          • memory/4780-35-0x0000000001F50000-0x0000000001F60000-memory.dmp

            Filesize

            64KB

          • memory/4780-37-0x0000000001F50000-0x0000000001F60000-memory.dmp

            Filesize

            64KB

          • memory/4780-36-0x0000000001F50000-0x0000000001F60000-memory.dmp

            Filesize

            64KB

          • memory/4780-38-0x0000000001F50000-0x0000000001F60000-memory.dmp

            Filesize

            64KB

          • memory/4780-17-0x0000000000980000-0x0000000000995000-memory.dmp

            Filesize

            84KB

          • memory/4780-41-0x0000000001F50000-0x0000000001F60000-memory.dmp

            Filesize

            64KB

          • memory/4780-39-0x0000000001F50000-0x0000000001F60000-memory.dmp

            Filesize

            64KB

          • memory/4780-43-0x0000000001F50000-0x0000000001F60000-memory.dmp

            Filesize

            64KB

          • memory/4780-42-0x0000000001F50000-0x0000000001F60000-memory.dmp

            Filesize

            64KB

          • memory/4780-45-0x0000000001F50000-0x0000000001F60000-memory.dmp

            Filesize

            64KB

          • memory/4780-44-0x0000000001F50000-0x0000000001F60000-memory.dmp

            Filesize

            64KB

          • memory/4780-47-0x0000000001F50000-0x0000000001F60000-memory.dmp

            Filesize

            64KB

          • memory/4780-46-0x0000000001F50000-0x0000000001F60000-memory.dmp

            Filesize

            64KB

          • memory/4780-49-0x0000000002DD0000-0x0000000002DD5000-memory.dmp

            Filesize

            20KB

          • memory/4780-48-0x0000000001F50000-0x0000000001F60000-memory.dmp

            Filesize

            64KB

          • memory/4780-53-0x0000000007900000-0x0000000007D0B000-memory.dmp

            Filesize

            4.0MB

          • memory/4780-52-0x0000000002DD0000-0x0000000002DD5000-memory.dmp

            Filesize

            20KB

          • memory/4780-56-0x0000000007900000-0x0000000007D0B000-memory.dmp

            Filesize

            4.0MB

          • memory/4780-57-0x0000000002DE0000-0x0000000002DE7000-memory.dmp

            Filesize

            28KB