Analysis

  • max time kernel
    152s
  • max time network
    158s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20231025-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20231025-enlocale:en-usos:windows10-2004-x64system
  • submitted
    19/11/2023, 23:08

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:3468
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\buynnmsw\
      2⤵
        PID:4744
      • C:\Windows\SysWOW64\cmd.exe
        "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\cjivddlp.exe" C:\Windows\SysWOW64\buynnmsw\
        2⤵
          PID:3204
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" create buynnmsw binPath= "C:\Windows\SysWOW64\buynnmsw\cjivddlp.exe /d\"C:\Users\Admin\AppData\Local\Temp\file.exe\"" type= own start= auto DisplayName= "wifi support"
          2⤵
          • Launches sc.exe
          PID:3364
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" description buynnmsw "wifi internet conection"
          2⤵
          • Launches sc.exe
          PID:2320
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" start buynnmsw
          2⤵
          • Launches sc.exe
          PID:2308
        • 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:1888
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 3468 -s 1040
          2⤵
          • Program crash
          PID:1552
      • C:\Windows\SysWOW64\buynnmsw\cjivddlp.exe
        C:\Windows\SysWOW64\buynnmsw\cjivddlp.exe /d"C:\Users\Admin\AppData\Local\Temp\file.exe"
        1⤵
        • Executes dropped EXE
        • Suspicious use of SetThreadContext
        • Suspicious use of WriteProcessMemory
        PID:3372
        • 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:3520
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 3372 -s 544
          2⤵
          • Program crash
          PID:2724
      • C:\Windows\SysWOW64\WerFault.exe
        C:\Windows\SysWOW64\WerFault.exe -pss -s 476 -p 3468 -ip 3468
        1⤵
          PID:3772
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -pss -s 468 -p 3372 -ip 3372
          1⤵
            PID:4296

          Network

                MITRE ATT&CK Enterprise v15

                Replay Monitor

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                Downloads

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

                  Filesize

                  10.2MB

                  MD5

                  6ec03342ee3f56dd8a604cc452823732

                  SHA1

                  4f11447c14a61be3f310c287b4f2499893ca592a

                  SHA256

                  24b2c04ac10e09dd57c0510f147e062c255ecdf77e6810738d2816e39f29feb1

                  SHA512

                  75b27355175ade0913a863a4bf08bf110bf65cc1528b141438144471057b9405af8833e178facc40a8613c93a6938876b191bb2dbe81563c2c75961763f81360

                • C:\Windows\SysWOW64\buynnmsw\cjivddlp.exe

                  Filesize

                  10.2MB

                  MD5

                  6ec03342ee3f56dd8a604cc452823732

                  SHA1

                  4f11447c14a61be3f310c287b4f2499893ca592a

                  SHA256

                  24b2c04ac10e09dd57c0510f147e062c255ecdf77e6810738d2816e39f29feb1

                  SHA512

                  75b27355175ade0913a863a4bf08bf110bf65cc1528b141438144471057b9405af8833e178facc40a8613c93a6938876b191bb2dbe81563c2c75961763f81360

                • memory/3372-19-0x0000000000400000-0x00000000004F7000-memory.dmp

                  Filesize

                  988KB

                • memory/3372-11-0x00000000007B0000-0x00000000008B0000-memory.dmp

                  Filesize

                  1024KB

                • memory/3372-12-0x0000000000400000-0x00000000004F7000-memory.dmp

                  Filesize

                  988KB

                • memory/3468-2-0x0000000002250000-0x0000000002263000-memory.dmp

                  Filesize

                  76KB

                • memory/3468-3-0x0000000000400000-0x00000000004F7000-memory.dmp

                  Filesize

                  988KB

                • memory/3468-6-0x0000000000400000-0x00000000004F7000-memory.dmp

                  Filesize

                  988KB

                • memory/3468-8-0x0000000000400000-0x00000000004F7000-memory.dmp

                  Filesize

                  988KB

                • memory/3468-9-0x0000000002250000-0x0000000002263000-memory.dmp

                  Filesize

                  76KB

                • memory/3468-1-0x00000000007B0000-0x00000000008B0000-memory.dmp

                  Filesize

                  1024KB

                • memory/3520-32-0x0000000002810000-0x0000000002820000-memory.dmp

                  Filesize

                  64KB

                • memory/3520-38-0x0000000002810000-0x0000000002820000-memory.dmp

                  Filesize

                  64KB

                • memory/3520-18-0x0000000000740000-0x0000000000755000-memory.dmp

                  Filesize

                  84KB

                • memory/3520-16-0x0000000000740000-0x0000000000755000-memory.dmp

                  Filesize

                  84KB

                • memory/3520-21-0x0000000002600000-0x000000000280F000-memory.dmp

                  Filesize

                  2.1MB

                • memory/3520-24-0x0000000002600000-0x000000000280F000-memory.dmp

                  Filesize

                  2.1MB

                • memory/3520-25-0x0000000001DF0000-0x0000000001DF6000-memory.dmp

                  Filesize

                  24KB

                • memory/3520-28-0x0000000002810000-0x0000000002820000-memory.dmp

                  Filesize

                  64KB

                • memory/3520-31-0x0000000002810000-0x0000000002820000-memory.dmp

                  Filesize

                  64KB

                • memory/3520-13-0x0000000000740000-0x0000000000755000-memory.dmp

                  Filesize

                  84KB

                • memory/3520-33-0x0000000002810000-0x0000000002820000-memory.dmp

                  Filesize

                  64KB

                • memory/3520-34-0x0000000002810000-0x0000000002820000-memory.dmp

                  Filesize

                  64KB

                • memory/3520-35-0x0000000002810000-0x0000000002820000-memory.dmp

                  Filesize

                  64KB

                • memory/3520-36-0x0000000002810000-0x0000000002820000-memory.dmp

                  Filesize

                  64KB

                • memory/3520-37-0x0000000002810000-0x0000000002820000-memory.dmp

                  Filesize

                  64KB

                • memory/3520-17-0x0000000000740000-0x0000000000755000-memory.dmp

                  Filesize

                  84KB

                • memory/3520-39-0x0000000002810000-0x0000000002820000-memory.dmp

                  Filesize

                  64KB

                • memory/3520-40-0x0000000002810000-0x0000000002820000-memory.dmp

                  Filesize

                  64KB

                • memory/3520-42-0x0000000002810000-0x0000000002820000-memory.dmp

                  Filesize

                  64KB

                • memory/3520-43-0x0000000002810000-0x0000000002820000-memory.dmp

                  Filesize

                  64KB

                • memory/3520-41-0x0000000002810000-0x0000000002820000-memory.dmp

                  Filesize

                  64KB

                • memory/3520-44-0x0000000002810000-0x0000000002820000-memory.dmp

                  Filesize

                  64KB

                • memory/3520-45-0x0000000002810000-0x0000000002820000-memory.dmp

                  Filesize

                  64KB

                • memory/3520-46-0x0000000002810000-0x0000000002820000-memory.dmp

                  Filesize

                  64KB

                • memory/3520-47-0x0000000002810000-0x0000000002820000-memory.dmp

                  Filesize

                  64KB

                • memory/3520-48-0x00000000029E0000-0x00000000029E5000-memory.dmp

                  Filesize

                  20KB

                • memory/3520-51-0x00000000029E0000-0x00000000029E5000-memory.dmp

                  Filesize

                  20KB

                • memory/3520-52-0x0000000007500000-0x000000000790B000-memory.dmp

                  Filesize

                  4.0MB

                • memory/3520-55-0x0000000007500000-0x000000000790B000-memory.dmp

                  Filesize

                  4.0MB

                • memory/3520-56-0x00000000029F0000-0x00000000029F7000-memory.dmp

                  Filesize

                  28KB

                • memory/3520-60-0x0000000000740000-0x0000000000755000-memory.dmp

                  Filesize

                  84KB