Analysis

  • max time kernel
    152s
  • max time network
    157s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20231023-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20231023-enlocale:en-usos:windows10-2004-x64system
  • submitted
    19/11/2023, 23:07

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 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:3692
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\ymfqhccw\
      2⤵
        PID:4512
      • C:\Windows\SysWOW64\cmd.exe
        "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\elojiccw.exe" C:\Windows\SysWOW64\ymfqhccw\
        2⤵
          PID:4204
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" create ymfqhccw binPath= "C:\Windows\SysWOW64\ymfqhccw\elojiccw.exe /d\"C:\Users\Admin\AppData\Local\Temp\file.exe\"" type= own start= auto DisplayName= "wifi support"
          2⤵
          • Launches sc.exe
          PID:1188
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" description ymfqhccw "wifi internet conection"
          2⤵
          • Launches sc.exe
          PID:4580
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" start ymfqhccw
          2⤵
          • Launches sc.exe
          PID:4036
        • 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:780
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 3692 -s 1040
          2⤵
          • Program crash
          PID:3900
      • C:\Windows\SysWOW64\ymfqhccw\elojiccw.exe
        C:\Windows\SysWOW64\ymfqhccw\elojiccw.exe /d"C:\Users\Admin\AppData\Local\Temp\file.exe"
        1⤵
        • Executes dropped EXE
        • Suspicious use of SetThreadContext
        • Suspicious use of WriteProcessMemory
        PID:3568
        • 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:3904
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 3568 -s 528
          2⤵
          • Program crash
          PID:5004
      • C:\Windows\SysWOW64\WerFault.exe
        C:\Windows\SysWOW64\WerFault.exe -pss -s 460 -p 3692 -ip 3692
        1⤵
          PID:3672
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -pss -s 468 -p 3568 -ip 3568
          1⤵
            PID:2144

          Network

                MITRE ATT&CK Enterprise v15

                Replay Monitor

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                Downloads

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

                  Filesize

                  13.6MB

                  MD5

                  bf54a593fb1845665009cfe35f5f1337

                  SHA1

                  c92529161651f400ac700a62f55f790ab8871e9d

                  SHA256

                  eeee740932d57602768298de2c2a68de58f64d10ff2badfc9fe1fe0696fa7511

                  SHA512

                  9f50e0bddb918e074dfaebb0338e9bf4005eefef008c98208dcc20232b82bdb0307492b1c1271b19e039d7943c33598a4ad4804a77fc2f6249019c2a7bfd106c

                • C:\Windows\SysWOW64\ymfqhccw\elojiccw.exe

                  Filesize

                  13.6MB

                  MD5

                  bf54a593fb1845665009cfe35f5f1337

                  SHA1

                  c92529161651f400ac700a62f55f790ab8871e9d

                  SHA256

                  eeee740932d57602768298de2c2a68de58f64d10ff2badfc9fe1fe0696fa7511

                  SHA512

                  9f50e0bddb918e074dfaebb0338e9bf4005eefef008c98208dcc20232b82bdb0307492b1c1271b19e039d7943c33598a4ad4804a77fc2f6249019c2a7bfd106c

                • memory/3568-17-0x0000000000400000-0x00000000004F7000-memory.dmp

                  Filesize

                  988KB

                • memory/3568-10-0x00000000006A0000-0x00000000007A0000-memory.dmp

                  Filesize

                  1024KB

                • memory/3568-11-0x0000000000400000-0x00000000004F7000-memory.dmp

                  Filesize

                  988KB

                • memory/3692-2-0x0000000002240000-0x0000000002253000-memory.dmp

                  Filesize

                  76KB

                • memory/3692-3-0x0000000000400000-0x00000000004F7000-memory.dmp

                  Filesize

                  988KB

                • memory/3692-7-0x0000000000400000-0x00000000004F7000-memory.dmp

                  Filesize

                  988KB

                • memory/3692-8-0x0000000002240000-0x0000000002253000-memory.dmp

                  Filesize

                  76KB

                • memory/3692-1-0x0000000000510000-0x0000000000610000-memory.dmp

                  Filesize

                  1024KB

                • memory/3904-32-0x0000000002570000-0x0000000002580000-memory.dmp

                  Filesize

                  64KB

                • memory/3904-37-0x0000000002570000-0x0000000002580000-memory.dmp

                  Filesize

                  64KB

                • memory/3904-16-0x0000000000FB0000-0x0000000000FC5000-memory.dmp

                  Filesize

                  84KB

                • memory/3904-19-0x0000000002E00000-0x000000000300F000-memory.dmp

                  Filesize

                  2.1MB

                • memory/3904-22-0x0000000002E00000-0x000000000300F000-memory.dmp

                  Filesize

                  2.1MB

                • memory/3904-23-0x0000000002560000-0x0000000002566000-memory.dmp

                  Filesize

                  24KB

                • memory/3904-26-0x0000000002570000-0x0000000002580000-memory.dmp

                  Filesize

                  64KB

                • memory/3904-29-0x0000000002570000-0x0000000002580000-memory.dmp

                  Filesize

                  64KB

                • memory/3904-30-0x0000000002570000-0x0000000002580000-memory.dmp

                  Filesize

                  64KB

                • memory/3904-33-0x0000000002570000-0x0000000002580000-memory.dmp

                  Filesize

                  64KB

                • memory/3904-12-0x0000000000FB0000-0x0000000000FC5000-memory.dmp

                  Filesize

                  84KB

                • memory/3904-34-0x0000000002570000-0x0000000002580000-memory.dmp

                  Filesize

                  64KB

                • memory/3904-31-0x0000000002570000-0x0000000002580000-memory.dmp

                  Filesize

                  64KB

                • memory/3904-35-0x0000000002570000-0x0000000002580000-memory.dmp

                  Filesize

                  64KB

                • memory/3904-36-0x0000000002570000-0x0000000002580000-memory.dmp

                  Filesize

                  64KB

                • memory/3904-15-0x0000000000FB0000-0x0000000000FC5000-memory.dmp

                  Filesize

                  84KB

                • memory/3904-38-0x0000000002570000-0x0000000002580000-memory.dmp

                  Filesize

                  64KB

                • memory/3904-39-0x0000000002570000-0x0000000002580000-memory.dmp

                  Filesize

                  64KB

                • memory/3904-40-0x0000000002570000-0x0000000002580000-memory.dmp

                  Filesize

                  64KB

                • memory/3904-41-0x0000000002570000-0x0000000002580000-memory.dmp

                  Filesize

                  64KB

                • memory/3904-42-0x0000000002570000-0x0000000002580000-memory.dmp

                  Filesize

                  64KB

                • memory/3904-43-0x0000000002570000-0x0000000002580000-memory.dmp

                  Filesize

                  64KB

                • memory/3904-44-0x0000000002570000-0x0000000002580000-memory.dmp

                  Filesize

                  64KB

                • memory/3904-45-0x0000000002570000-0x0000000002580000-memory.dmp

                  Filesize

                  64KB

                • memory/3904-46-0x00000000025E0000-0x00000000025E5000-memory.dmp

                  Filesize

                  20KB

                • memory/3904-49-0x00000000025E0000-0x00000000025E5000-memory.dmp

                  Filesize

                  20KB

                • memory/3904-50-0x0000000007F00000-0x000000000830B000-memory.dmp

                  Filesize

                  4.0MB

                • memory/3904-53-0x0000000007F00000-0x000000000830B000-memory.dmp

                  Filesize

                  4.0MB

                • memory/3904-54-0x00000000025F0000-0x00000000025F7000-memory.dmp

                  Filesize

                  28KB

                • memory/3904-58-0x0000000000FB0000-0x0000000000FC5000-memory.dmp

                  Filesize

                  84KB