Analysis

  • max time kernel
    150s
  • max time network
    158s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20231020-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20231020-enlocale:en-usos:windows10-2004-x64system
  • submitted
    19/11/2023, 22:27

General

  • Target

    7a4cfb277cc054d761bde28a0f92caa9f142ad61959923a023a0d8248ad1c4ee.exe

  • Size

    254KB

  • MD5

    02ac11d7691ed7141949fc5c03d5aae8

  • SHA1

    b122e23b4dfb29d4efedbbe7a72c75d696f8a7ac

  • SHA256

    7a4cfb277cc054d761bde28a0f92caa9f142ad61959923a023a0d8248ad1c4ee

  • SHA512

    c437f0cec3cbe5a62a650cafd0814016864c083a2df5a65000d0411b8249daec0744b7c948039a97848135a263ba183a9cb00876fbc3d22ee1e8322dfda0e55e

  • SSDEEP

    3072:M9xGAh803FPqB1HzqotaoQpxVKPk4hjw6EX7eUkpvTRSdnbr4rO/p/4CY/:w/8iYlAxVKMuELrdnbr4yG

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\7a4cfb277cc054d761bde28a0f92caa9f142ad61959923a023a0d8248ad1c4ee.exe
    "C:\Users\Admin\AppData\Local\Temp\7a4cfb277cc054d761bde28a0f92caa9f142ad61959923a023a0d8248ad1c4ee.exe"
    1⤵
    • Checks computer location settings
    • Suspicious use of WriteProcessMemory
    PID:1868
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\voerzikm\
      2⤵
        PID:4952
      • C:\Windows\SysWOW64\cmd.exe
        "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\hfpqsorx.exe" C:\Windows\SysWOW64\voerzikm\
        2⤵
          PID:1276
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" create voerzikm binPath= "C:\Windows\SysWOW64\voerzikm\hfpqsorx.exe /d\"C:\Users\Admin\AppData\Local\Temp\7a4cfb277cc054d761bde28a0f92caa9f142ad61959923a023a0d8248ad1c4ee.exe\"" type= own start= auto DisplayName= "wifi support"
          2⤵
          • Launches sc.exe
          PID:5064
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" description voerzikm "wifi internet conection"
          2⤵
          • Launches sc.exe
          PID:3064
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" start voerzikm
          2⤵
          • Launches sc.exe
          PID:872
        • 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:1928
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 1868 -s 672
          2⤵
          • Program crash
          PID:4556
      • C:\Windows\SysWOW64\WerFault.exe
        C:\Windows\SysWOW64\WerFault.exe -pss -s 464 -p 1868 -ip 1868
        1⤵
          PID:4208
        • C:\Windows\SysWOW64\voerzikm\hfpqsorx.exe
          C:\Windows\SysWOW64\voerzikm\hfpqsorx.exe /d"C:\Users\Admin\AppData\Local\Temp\7a4cfb277cc054d761bde28a0f92caa9f142ad61959923a023a0d8248ad1c4ee.exe"
          1⤵
          • Sets service image path in registry
          • Executes dropped EXE
          • Suspicious use of SetThreadContext
          • Suspicious use of WriteProcessMemory
          PID:376
          • C:\Windows\SysWOW64\svchost.exe
            svchost.exe
            2⤵
            • Deletes itself
            • Drops file in System32 directory
            • Modifies data under HKEY_USERS
            PID:532
          • C:\Windows\SysWOW64\WerFault.exe
            C:\Windows\SysWOW64\WerFault.exe -u -p 376 -s 520
            2⤵
            • Program crash
            PID:2476
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -pss -s 432 -p 376 -ip 376
          1⤵
            PID:2268

          Network

                MITRE ATT&CK Enterprise v15

                Replay Monitor

                Loading Replay Monitor...

                Downloads

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

                  Filesize

                  13.6MB

                  MD5

                  39de7325b2b9defb1b91240936acccd4

                  SHA1

                  2d233a36bf18dcb086646badfd1120c08a744d3a

                  SHA256

                  4eb9ee167d64e6a925d74d7d80c3e6e850ba94fda7af38f3b9e8a03dd905308c

                  SHA512

                  3ddd7064c735ea9cf7eeeb910a8c3f8cbc213cf8f887e7fc4c1f03dea548cece5ef6d166aeffc14a4c9780b70e6b4cb21709a7b0a4bfb0baf5cf76edf65a1bc6

                • C:\Windows\SysWOW64\voerzikm\hfpqsorx.exe

                  Filesize

                  13.6MB

                  MD5

                  39de7325b2b9defb1b91240936acccd4

                  SHA1

                  2d233a36bf18dcb086646badfd1120c08a744d3a

                  SHA256

                  4eb9ee167d64e6a925d74d7d80c3e6e850ba94fda7af38f3b9e8a03dd905308c

                  SHA512

                  3ddd7064c735ea9cf7eeeb910a8c3f8cbc213cf8f887e7fc4c1f03dea548cece5ef6d166aeffc14a4c9780b70e6b4cb21709a7b0a4bfb0baf5cf76edf65a1bc6

                • memory/376-19-0x0000000000400000-0x00000000004F3000-memory.dmp

                  Filesize

                  972KB

                • memory/376-13-0x0000000000400000-0x00000000004F3000-memory.dmp

                  Filesize

                  972KB

                • memory/376-12-0x0000000000400000-0x00000000004F3000-memory.dmp

                  Filesize

                  972KB

                • memory/376-11-0x0000000000540000-0x0000000000640000-memory.dmp

                  Filesize

                  1024KB

                • memory/532-33-0x0000000001FF0000-0x0000000002000000-memory.dmp

                  Filesize

                  64KB

                • memory/532-37-0x0000000001FF0000-0x0000000002000000-memory.dmp

                  Filesize

                  64KB

                • memory/532-61-0x0000000000C60000-0x0000000000C75000-memory.dmp

                  Filesize

                  84KB

                • memory/532-57-0x0000000002DE0000-0x0000000002DE7000-memory.dmp

                  Filesize

                  28KB

                • memory/532-56-0x0000000007840000-0x0000000007C4B000-memory.dmp

                  Filesize

                  4.0MB

                • memory/532-14-0x0000000000C60000-0x0000000000C75000-memory.dmp

                  Filesize

                  84KB

                • memory/532-17-0x0000000000C60000-0x0000000000C75000-memory.dmp

                  Filesize

                  84KB

                • memory/532-18-0x0000000000C60000-0x0000000000C75000-memory.dmp

                  Filesize

                  84KB

                • memory/532-52-0x0000000002DD0000-0x0000000002DD5000-memory.dmp

                  Filesize

                  20KB

                • memory/532-20-0x0000000000C60000-0x0000000000C75000-memory.dmp

                  Filesize

                  84KB

                • memory/532-22-0x0000000002800000-0x0000000002A0F000-memory.dmp

                  Filesize

                  2.1MB

                • memory/532-25-0x0000000002800000-0x0000000002A0F000-memory.dmp

                  Filesize

                  2.1MB

                • memory/532-26-0x0000000001FE0000-0x0000000001FE6000-memory.dmp

                  Filesize

                  24KB

                • memory/532-29-0x0000000001FF0000-0x0000000002000000-memory.dmp

                  Filesize

                  64KB

                • memory/532-53-0x0000000007840000-0x0000000007C4B000-memory.dmp

                  Filesize

                  4.0MB

                • memory/532-34-0x0000000001FF0000-0x0000000002000000-memory.dmp

                  Filesize

                  64KB

                • memory/532-32-0x0000000001FF0000-0x0000000002000000-memory.dmp

                  Filesize

                  64KB

                • memory/532-35-0x0000000001FF0000-0x0000000002000000-memory.dmp

                  Filesize

                  64KB

                • memory/532-36-0x0000000001FF0000-0x0000000002000000-memory.dmp

                  Filesize

                  64KB

                • memory/532-49-0x0000000002DD0000-0x0000000002DD5000-memory.dmp

                  Filesize

                  20KB

                • memory/532-38-0x0000000001FF0000-0x0000000002000000-memory.dmp

                  Filesize

                  64KB

                • memory/532-39-0x0000000001FF0000-0x0000000002000000-memory.dmp

                  Filesize

                  64KB

                • memory/532-40-0x0000000001FF0000-0x0000000002000000-memory.dmp

                  Filesize

                  64KB

                • memory/532-41-0x0000000001FF0000-0x0000000002000000-memory.dmp

                  Filesize

                  64KB

                • memory/532-42-0x0000000001FF0000-0x0000000002000000-memory.dmp

                  Filesize

                  64KB

                • memory/532-44-0x0000000001FF0000-0x0000000002000000-memory.dmp

                  Filesize

                  64KB

                • memory/532-45-0x0000000001FF0000-0x0000000002000000-memory.dmp

                  Filesize

                  64KB

                • memory/532-43-0x0000000001FF0000-0x0000000002000000-memory.dmp

                  Filesize

                  64KB

                • memory/532-47-0x0000000001FF0000-0x0000000002000000-memory.dmp

                  Filesize

                  64KB

                • memory/532-46-0x0000000001FF0000-0x0000000002000000-memory.dmp

                  Filesize

                  64KB

                • memory/532-48-0x0000000001FF0000-0x0000000002000000-memory.dmp

                  Filesize

                  64KB

                • memory/1868-8-0x00000000006A0000-0x00000000006B3000-memory.dmp

                  Filesize

                  76KB

                • memory/1868-1-0x0000000000400000-0x00000000004F3000-memory.dmp

                  Filesize

                  972KB

                • memory/1868-2-0x00000000006C0000-0x00000000007C0000-memory.dmp

                  Filesize

                  1024KB

                • memory/1868-3-0x00000000006A0000-0x00000000006B3000-memory.dmp

                  Filesize

                  76KB

                • memory/1868-4-0x0000000000400000-0x00000000004F3000-memory.dmp

                  Filesize

                  972KB

                • memory/1868-7-0x0000000000400000-0x00000000004F3000-memory.dmp

                  Filesize

                  972KB