Analysis

  • max time kernel
    147s
  • max time network
    154s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20230915-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20230915-enlocale:en-usos:windows10-2004-x64system
  • submitted
    17/09/2023, 16:58

General

  • Target

    file.exe

  • Size

    227KB

  • MD5

    968d7b91a331234c30946bf3b6834e85

  • SHA1

    b8fd455add6140b20fbb1244d9cd33a7cec9f85b

  • SHA256

    c5fc6da4ebc5e3685e3b4d162d52a0688edfd1dae0d202a921b470cb7dd08cf9

  • SHA512

    e5b0987e099c8735da2ca5b5d7913735f0923bce8226937466fa967babf25e4a71537fea81e354b95fa08e260c401042177abea6e323a1016e306e49c9ae0629

  • SSDEEP

    3072:WEL7fZAMg8P9yo8ZGkAlhk/V3yDBzAlz:pfmMg5o8ZuKiDRA

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.

  • 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:4256
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\zovxxamw\
      2⤵
        PID:1704
      • C:\Windows\SysWOW64\cmd.exe
        "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\zgnqftmw.exe" C:\Windows\SysWOW64\zovxxamw\
        2⤵
          PID:3580
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" create zovxxamw binPath= "C:\Windows\SysWOW64\zovxxamw\zgnqftmw.exe /d\"C:\Users\Admin\AppData\Local\Temp\file.exe\"" type= own start= auto DisplayName= "wifi support"
          2⤵
          • Launches sc.exe
          PID:2252
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" description zovxxamw "wifi internet conection"
          2⤵
          • Launches sc.exe
          PID:4788
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" start zovxxamw
          2⤵
          • Launches sc.exe
          PID:2284
        • 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:2796
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 4256 -s 672
          2⤵
          • Program crash
          PID:4484
      • C:\Windows\SysWOW64\zovxxamw\zgnqftmw.exe
        C:\Windows\SysWOW64\zovxxamw\zgnqftmw.exe /d"C:\Users\Admin\AppData\Local\Temp\file.exe"
        1⤵
        • Executes dropped EXE
        • Suspicious use of SetThreadContext
        • Suspicious use of WriteProcessMemory
        PID:3124
        • C:\Windows\SysWOW64\svchost.exe
          svchost.exe
          2⤵
          • Sets service image path in registry
          • Drops file in System32 directory
          • Modifies data under HKEY_USERS
          PID:2952
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 3124 -s 520
          2⤵
          • Program crash
          PID:2560
      • C:\Windows\SysWOW64\WerFault.exe
        C:\Windows\SysWOW64\WerFault.exe -pss -s 452 -p 4256 -ip 4256
        1⤵
          PID:1776
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -pss -s 556 -p 3124 -ip 3124
          1⤵
            PID:3816

          Network

                MITRE ATT&CK Enterprise v15

                Replay Monitor

                Loading Replay Monitor...

                Downloads

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

                  Filesize

                  13.7MB

                  MD5

                  edae333cbade9baf0f1db3d7a41ac48b

                  SHA1

                  463e07613987878c16db56c15d7561f8fd34a7d4

                  SHA256

                  c7eaf44433543af8ca6a02ea0c8e661df5333695e5dcd29d03b5e842bca462b2

                  SHA512

                  645900ee3df1b9903740fcdcffde09c982a6c3f6a7d1a6b7f24e452bf90bf0f641beaea52fa492facda7b26f7c9edb32bec77d2c76cb91a32fa487f34968904d

                • C:\Windows\SysWOW64\zovxxamw\zgnqftmw.exe

                  Filesize

                  13.7MB

                  MD5

                  edae333cbade9baf0f1db3d7a41ac48b

                  SHA1

                  463e07613987878c16db56c15d7561f8fd34a7d4

                  SHA256

                  c7eaf44433543af8ca6a02ea0c8e661df5333695e5dcd29d03b5e842bca462b2

                  SHA512

                  645900ee3df1b9903740fcdcffde09c982a6c3f6a7d1a6b7f24e452bf90bf0f641beaea52fa492facda7b26f7c9edb32bec77d2c76cb91a32fa487f34968904d

                • memory/2952-32-0x0000000002790000-0x00000000027A0000-memory.dmp

                  Filesize

                  64KB

                • memory/2952-25-0x0000000002780000-0x0000000002786000-memory.dmp

                  Filesize

                  24KB

                • memory/2952-56-0x00000000033E0000-0x00000000033E7000-memory.dmp

                  Filesize

                  28KB

                • memory/2952-55-0x0000000008000000-0x000000000840B000-memory.dmp

                  Filesize

                  4.0MB

                • memory/2952-52-0x0000000008000000-0x000000000840B000-memory.dmp

                  Filesize

                  4.0MB

                • memory/2952-10-0x00000000012D0000-0x00000000012E5000-memory.dmp

                  Filesize

                  84KB

                • memory/2952-51-0x00000000033D0000-0x00000000033D5000-memory.dmp

                  Filesize

                  20KB

                • memory/2952-48-0x00000000033D0000-0x00000000033D5000-memory.dmp

                  Filesize

                  20KB

                • memory/2952-15-0x00000000012D0000-0x00000000012E5000-memory.dmp

                  Filesize

                  84KB

                • memory/2952-47-0x0000000002790000-0x00000000027A0000-memory.dmp

                  Filesize

                  64KB

                • memory/2952-17-0x00000000012D0000-0x00000000012E5000-memory.dmp

                  Filesize

                  84KB

                • memory/2952-18-0x00000000012D0000-0x00000000012E5000-memory.dmp

                  Filesize

                  84KB

                • memory/2952-20-0x00000000012D0000-0x00000000012E5000-memory.dmp

                  Filesize

                  84KB

                • memory/2952-21-0x0000000003000000-0x000000000320F000-memory.dmp

                  Filesize

                  2.1MB

                • memory/2952-24-0x0000000003000000-0x000000000320F000-memory.dmp

                  Filesize

                  2.1MB

                • memory/2952-28-0x0000000002790000-0x00000000027A0000-memory.dmp

                  Filesize

                  64KB

                • memory/2952-33-0x0000000002790000-0x00000000027A0000-memory.dmp

                  Filesize

                  64KB

                • memory/2952-31-0x0000000002790000-0x00000000027A0000-memory.dmp

                  Filesize

                  64KB

                • memory/2952-46-0x0000000002790000-0x00000000027A0000-memory.dmp

                  Filesize

                  64KB

                • memory/2952-45-0x0000000002790000-0x00000000027A0000-memory.dmp

                  Filesize

                  64KB

                • memory/2952-37-0x0000000002790000-0x00000000027A0000-memory.dmp

                  Filesize

                  64KB

                • memory/2952-35-0x0000000002790000-0x00000000027A0000-memory.dmp

                  Filesize

                  64KB

                • memory/2952-36-0x0000000002790000-0x00000000027A0000-memory.dmp

                  Filesize

                  64KB

                • memory/2952-34-0x0000000002790000-0x00000000027A0000-memory.dmp

                  Filesize

                  64KB

                • memory/2952-38-0x0000000002790000-0x00000000027A0000-memory.dmp

                  Filesize

                  64KB

                • memory/2952-39-0x0000000002790000-0x00000000027A0000-memory.dmp

                  Filesize

                  64KB

                • memory/2952-40-0x0000000002790000-0x00000000027A0000-memory.dmp

                  Filesize

                  64KB

                • memory/2952-41-0x0000000002790000-0x00000000027A0000-memory.dmp

                  Filesize

                  64KB

                • memory/2952-42-0x0000000002790000-0x00000000027A0000-memory.dmp

                  Filesize

                  64KB

                • memory/2952-44-0x0000000002790000-0x00000000027A0000-memory.dmp

                  Filesize

                  64KB

                • memory/2952-43-0x0000000002790000-0x00000000027A0000-memory.dmp

                  Filesize

                  64KB

                • memory/3124-16-0x0000000000400000-0x0000000000707000-memory.dmp

                  Filesize

                  3.0MB

                • memory/3124-9-0x0000000000400000-0x0000000000707000-memory.dmp

                  Filesize

                  3.0MB

                • memory/3124-8-0x00000000008B0000-0x00000000009B0000-memory.dmp

                  Filesize

                  1024KB

                • memory/4256-1-0x0000000000930000-0x0000000000A30000-memory.dmp

                  Filesize

                  1024KB

                • memory/4256-3-0x0000000000400000-0x0000000000707000-memory.dmp

                  Filesize

                  3.0MB

                • memory/4256-13-0x0000000002450000-0x0000000002463000-memory.dmp

                  Filesize

                  76KB

                • memory/4256-11-0x0000000000400000-0x0000000000707000-memory.dmp

                  Filesize

                  3.0MB

                • memory/4256-2-0x0000000002450000-0x0000000002463000-memory.dmp

                  Filesize

                  76KB