Analysis

  • max time kernel
    150s
  • 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
    06/10/2023, 20:45

General

  • Target

    file.exe

  • Size

    274KB

  • MD5

    049fdbc1012cb68aaa6818b61b7f4b11

  • SHA1

    ba553585b390812b6c061c5912572504629bd3c6

  • SHA256

    a16609f43e79b5beb8901046e9f3d968fb02e955e25d6e6dc3e73e59b76cee23

  • SHA512

    b0407c3908ebe8ec140a909ad7b982491ec4240b12c965aa9c6e70d615287211dcef49e59fb18959128c41834f55b27f939fe765a9aba069218babb8856968c5

  • SSDEEP

    3072:Fw9OwdZjZb813D9L1vwY4rRh9g9sPgxBU:mhZ9b85DnvwY49g9s4xB

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 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:2464
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\puponzpf\
      2⤵
        PID:3948
      • C:\Windows\SysWOW64\cmd.exe
        "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\seuhvumq.exe" C:\Windows\SysWOW64\puponzpf\
        2⤵
          PID:1288
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" create puponzpf binPath= "C:\Windows\SysWOW64\puponzpf\seuhvumq.exe /d\"C:\Users\Admin\AppData\Local\Temp\file.exe\"" type= own start= auto DisplayName= "wifi support"
          2⤵
          • Launches sc.exe
          PID:3404
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" description puponzpf "wifi internet conection"
          2⤵
          • Launches sc.exe
          PID:1316
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" start puponzpf
          2⤵
          • Launches sc.exe
          PID:4976
        • 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:2980
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 2464 -s 1036
          2⤵
          • Program crash
          PID:3336
      • C:\Windows\SysWOW64\puponzpf\seuhvumq.exe
        C:\Windows\SysWOW64\puponzpf\seuhvumq.exe /d"C:\Users\Admin\AppData\Local\Temp\file.exe"
        1⤵
        • Executes dropped EXE
        • Suspicious use of SetThreadContext
        • Suspicious use of WriteProcessMemory
        PID:4180
        • 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:1084
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 4180 -s 520
          2⤵
          • Program crash
          PID:3332
      • C:\Windows\SysWOW64\WerFault.exe
        C:\Windows\SysWOW64\WerFault.exe -pss -s 460 -p 2464 -ip 2464
        1⤵
          PID:1468
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -pss -s 184 -p 4180 -ip 4180
          1⤵
            PID:3656

          Network

                MITRE ATT&CK Enterprise v15

                Replay Monitor

                Loading Replay Monitor...

                Downloads

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

                  Filesize

                  11.1MB

                  MD5

                  2128a28520b53f9ae5ebafaeee8d6aad

                  SHA1

                  5e57eee08e0692f4e5b1267a05d936a491d27114

                  SHA256

                  4f96f3b72b1f33f9021c60954e7820ae47674eb2cb93a11a9ce83c8f64c01efb

                  SHA512

                  a2abd891f6676a1a0523b2016fdc694f328ebab5d74f465d278c3a9f052d32169dacff762d1beef04f893b7781d68479d41e90773b294e3994fc5e50a0b0645b

                • C:\Windows\SysWOW64\puponzpf\seuhvumq.exe

                  Filesize

                  11.1MB

                  MD5

                  2128a28520b53f9ae5ebafaeee8d6aad

                  SHA1

                  5e57eee08e0692f4e5b1267a05d936a491d27114

                  SHA256

                  4f96f3b72b1f33f9021c60954e7820ae47674eb2cb93a11a9ce83c8f64c01efb

                  SHA512

                  a2abd891f6676a1a0523b2016fdc694f328ebab5d74f465d278c3a9f052d32169dacff762d1beef04f893b7781d68479d41e90773b294e3994fc5e50a0b0645b

                • memory/1084-32-0x0000000001F80000-0x0000000001F90000-memory.dmp

                  Filesize

                  64KB

                • memory/1084-35-0x0000000001F80000-0x0000000001F90000-memory.dmp

                  Filesize

                  64KB

                • memory/1084-56-0x0000000001FE0000-0x0000000001FE7000-memory.dmp

                  Filesize

                  28KB

                • memory/1084-55-0x0000000007700000-0x0000000007B0B000-memory.dmp

                  Filesize

                  4.0MB

                • memory/1084-52-0x0000000007700000-0x0000000007B0B000-memory.dmp

                  Filesize

                  4.0MB

                • memory/1084-36-0x0000000001F80000-0x0000000001F90000-memory.dmp

                  Filesize

                  64KB

                • memory/1084-11-0x0000000000AC0000-0x0000000000AD5000-memory.dmp

                  Filesize

                  84KB

                • memory/1084-14-0x0000000000AC0000-0x0000000000AD5000-memory.dmp

                  Filesize

                  84KB

                • memory/1084-51-0x0000000001FD0000-0x0000000001FD5000-memory.dmp

                  Filesize

                  20KB

                • memory/1084-18-0x0000000000AC0000-0x0000000000AD5000-memory.dmp

                  Filesize

                  84KB

                • memory/1084-20-0x0000000000AC0000-0x0000000000AD5000-memory.dmp

                  Filesize

                  84KB

                • memory/1084-21-0x0000000002800000-0x0000000002A0F000-memory.dmp

                  Filesize

                  2.1MB

                • memory/1084-25-0x0000000001F70000-0x0000000001F76000-memory.dmp

                  Filesize

                  24KB

                • memory/1084-24-0x0000000002800000-0x0000000002A0F000-memory.dmp

                  Filesize

                  2.1MB

                • memory/1084-28-0x0000000001F80000-0x0000000001F90000-memory.dmp

                  Filesize

                  64KB

                • memory/1084-31-0x0000000001F80000-0x0000000001F90000-memory.dmp

                  Filesize

                  64KB

                • memory/1084-48-0x0000000001FD0000-0x0000000001FD5000-memory.dmp

                  Filesize

                  20KB

                • memory/1084-33-0x0000000001F80000-0x0000000001F90000-memory.dmp

                  Filesize

                  64KB

                • memory/1084-47-0x0000000001F80000-0x0000000001F90000-memory.dmp

                  Filesize

                  64KB

                • memory/1084-34-0x0000000001F80000-0x0000000001F90000-memory.dmp

                  Filesize

                  64KB

                • memory/1084-46-0x0000000001F80000-0x0000000001F90000-memory.dmp

                  Filesize

                  64KB

                • memory/1084-37-0x0000000001F80000-0x0000000001F90000-memory.dmp

                  Filesize

                  64KB

                • memory/1084-38-0x0000000001F80000-0x0000000001F90000-memory.dmp

                  Filesize

                  64KB

                • memory/1084-39-0x0000000001F80000-0x0000000001F90000-memory.dmp

                  Filesize

                  64KB

                • memory/1084-42-0x0000000001F80000-0x0000000001F90000-memory.dmp

                  Filesize

                  64KB

                • memory/1084-40-0x0000000001F80000-0x0000000001F90000-memory.dmp

                  Filesize

                  64KB

                • memory/1084-41-0x0000000001F80000-0x0000000001F90000-memory.dmp

                  Filesize

                  64KB

                • memory/1084-43-0x0000000001F80000-0x0000000001F90000-memory.dmp

                  Filesize

                  64KB

                • memory/1084-44-0x0000000001F80000-0x0000000001F90000-memory.dmp

                  Filesize

                  64KB

                • memory/1084-45-0x0000000001F80000-0x0000000001F90000-memory.dmp

                  Filesize

                  64KB

                • memory/2464-4-0x0000000000400000-0x000000000228B000-memory.dmp

                  Filesize

                  30.5MB

                • memory/2464-1-0x00000000023C0000-0x00000000024C0000-memory.dmp

                  Filesize

                  1024KB

                • memory/2464-8-0x0000000003EA0000-0x0000000003EB3000-memory.dmp

                  Filesize

                  76KB

                • memory/2464-7-0x0000000000400000-0x000000000228B000-memory.dmp

                  Filesize

                  30.5MB

                • memory/2464-2-0x0000000003EA0000-0x0000000003EB3000-memory.dmp

                  Filesize

                  76KB

                • memory/4180-10-0x0000000002560000-0x0000000002660000-memory.dmp

                  Filesize

                  1024KB

                • memory/4180-15-0x0000000000400000-0x000000000228B000-memory.dmp

                  Filesize

                  30.5MB