Analysis

  • max time kernel
    140s
  • max time network
    154s
  • platform
    windows7_x64
  • resource
    win7-20240221-en
  • resource tags

    arch:x64arch:x86image:win7-20240221-enlocale:en-usos:windows7-x64system
  • submitted
    17-04-2024 13:00

General

  • Target

    f379c2c732470dbce8e17423baf7f6fcca63bcb13c4ade33a15df1225e3841be.exe

  • Size

    232KB

  • MD5

    b5f3dc95c09fa3bfdf009a404736f94e

  • SHA1

    03e471e7edf9bbcbe2483ebd1ba05364c93a190a

  • SHA256

    f379c2c732470dbce8e17423baf7f6fcca63bcb13c4ade33a15df1225e3841be

  • SHA512

    f63cba660384d5296e2f8aeeceba1a2d4707311a242cd5f12220008670cb5c2bf686b546fafe03cc6c5363bd62fe4c067a1f9dc73a8388488e13854b631ee546

  • SSDEEP

    6144:j6zxC0r84BWnfZUH7SFcQU+9HFsvKMXOCU:kY0r9BeZUbSiy9HSvKwO

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.

  • Windows security bypass 2 TTPs 1 IoCs
  • Creates new service(s) 1 TTPs
  • Modifies Windows Firewall 2 TTPs 1 IoCs
  • Sets service image path in registry 2 TTPs 1 IoCs
  • 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).

  • Modifies data under HKEY_USERS 7 IoCs
  • Suspicious use of WriteProcessMemory 30 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\f379c2c732470dbce8e17423baf7f6fcca63bcb13c4ade33a15df1225e3841be.exe
    "C:\Users\Admin\AppData\Local\Temp\f379c2c732470dbce8e17423baf7f6fcca63bcb13c4ade33a15df1225e3841be.exe"
    1⤵
    • Suspicious use of WriteProcessMemory
    PID:2140
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\xyxmfvuw\
      2⤵
        PID:476
      • C:\Windows\SysWOW64\cmd.exe
        "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\dblmoknt.exe" C:\Windows\SysWOW64\xyxmfvuw\
        2⤵
          PID:2956
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" create xyxmfvuw binPath= "C:\Windows\SysWOW64\xyxmfvuw\dblmoknt.exe /d\"C:\Users\Admin\AppData\Local\Temp\f379c2c732470dbce8e17423baf7f6fcca63bcb13c4ade33a15df1225e3841be.exe\"" type= own start= auto DisplayName= "wifi support"
          2⤵
          • Launches sc.exe
          PID:1012
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" description xyxmfvuw "wifi internet conection"
          2⤵
          • Launches sc.exe
          PID:2792
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" start xyxmfvuw
          2⤵
          • Launches sc.exe
          PID:2816
        • 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:2868
      • C:\Windows\SysWOW64\xyxmfvuw\dblmoknt.exe
        C:\Windows\SysWOW64\xyxmfvuw\dblmoknt.exe /d"C:\Users\Admin\AppData\Local\Temp\f379c2c732470dbce8e17423baf7f6fcca63bcb13c4ade33a15df1225e3841be.exe"
        1⤵
        • Executes dropped EXE
        • Suspicious use of SetThreadContext
        • Suspicious use of WriteProcessMemory
        PID:2088
        • C:\Windows\SysWOW64\svchost.exe
          svchost.exe
          2⤵
          • Windows security bypass
          • Sets service image path in registry
          • Deletes itself
          • Drops file in System32 directory
          • Modifies data under HKEY_USERS
          PID:900

      Network

      MITRE ATT&CK Matrix ATT&CK v13

      Persistence

      Create or Modify System Process

      2
      T1543

      Windows Service

      2
      T1543.003

      Boot or Logon Autostart Execution

      1
      T1547

      Registry Run Keys / Startup Folder

      1
      T1547.001

      Privilege Escalation

      Create or Modify System Process

      2
      T1543

      Windows Service

      2
      T1543.003

      Boot or Logon Autostart Execution

      1
      T1547

      Registry Run Keys / Startup Folder

      1
      T1547.001

      Defense Evasion

      Impair Defenses

      2
      T1562

      Disable or Modify Tools

      1
      T1562.001

      Disable or Modify System Firewall

      1
      T1562.004

      Modify Registry

      2
      T1112

      Discovery

      System Information Discovery

      1
      T1082

      Replay Monitor

      Loading Replay Monitor...

      Downloads

      • C:\Users\Admin\AppData\Local\Temp\dblmoknt.exe
        Filesize

        13.2MB

        MD5

        e34c58e91a7bd19575f091e1759ab0c4

        SHA1

        3f1fbfe87135ff9eda9c080bb5aa20802e48f9ad

        SHA256

        25582a09074d7aadab2d0a9dc7cab9d773784a95ce4e89daddc20903e45ddd36

        SHA512

        0d382ed34f95c7eda6a0aabaceaa2bd79175597fb86e68ce5fe6d57efd33e443118fbf51bbeec54226d6b4f30272a17aa0fd173fd7a39e3b27e4681f852a0695

      • memory/900-44-0x00000000000F0000-0x0000000000100000-memory.dmp
        Filesize

        64KB

      • memory/900-49-0x0000000000100000-0x0000000000105000-memory.dmp
        Filesize

        20KB

      • memory/900-61-0x0000000000080000-0x0000000000095000-memory.dmp
        Filesize

        84KB

      • memory/900-57-0x0000000000300000-0x0000000000307000-memory.dmp
        Filesize

        28KB

      • memory/900-56-0x0000000005430000-0x000000000583B000-memory.dmp
        Filesize

        4.0MB

      • memory/900-10-0x0000000000080000-0x0000000000095000-memory.dmp
        Filesize

        84KB

      • memory/900-34-0x00000000000F0000-0x0000000000100000-memory.dmp
        Filesize

        64KB

      • memory/900-14-0x0000000000080000-0x0000000000095000-memory.dmp
        Filesize

        84KB

      • memory/900-11-0x000000007EFDE000-0x000000007EFDF000-memory.dmp
        Filesize

        4KB

      • memory/900-52-0x0000000000100000-0x0000000000105000-memory.dmp
        Filesize

        20KB

      • memory/900-19-0x0000000000080000-0x0000000000095000-memory.dmp
        Filesize

        84KB

      • memory/900-18-0x0000000000080000-0x0000000000095000-memory.dmp
        Filesize

        84KB

      • memory/900-20-0x0000000000080000-0x0000000000095000-memory.dmp
        Filesize

        84KB

      • memory/900-22-0x0000000001930000-0x0000000001B3F000-memory.dmp
        Filesize

        2.1MB

      • memory/900-25-0x0000000001930000-0x0000000001B3F000-memory.dmp
        Filesize

        2.1MB

      • memory/900-26-0x00000000000A0000-0x00000000000A6000-memory.dmp
        Filesize

        24KB

      • memory/900-29-0x00000000000F0000-0x0000000000100000-memory.dmp
        Filesize

        64KB

      • memory/900-35-0x00000000000F0000-0x0000000000100000-memory.dmp
        Filesize

        64KB

      • memory/900-53-0x0000000005430000-0x000000000583B000-memory.dmp
        Filesize

        4.0MB

      • memory/900-33-0x00000000000F0000-0x0000000000100000-memory.dmp
        Filesize

        64KB

      • memory/900-32-0x00000000000F0000-0x0000000000100000-memory.dmp
        Filesize

        64KB

      • memory/900-36-0x00000000000F0000-0x0000000000100000-memory.dmp
        Filesize

        64KB

      • memory/900-37-0x00000000000F0000-0x0000000000100000-memory.dmp
        Filesize

        64KB

      • memory/900-38-0x00000000000F0000-0x0000000000100000-memory.dmp
        Filesize

        64KB

      • memory/900-40-0x00000000000F0000-0x0000000000100000-memory.dmp
        Filesize

        64KB

      • memory/900-39-0x00000000000F0000-0x0000000000100000-memory.dmp
        Filesize

        64KB

      • memory/900-41-0x00000000000F0000-0x0000000000100000-memory.dmp
        Filesize

        64KB

      • memory/900-43-0x00000000000F0000-0x0000000000100000-memory.dmp
        Filesize

        64KB

      • memory/900-42-0x00000000000F0000-0x0000000000100000-memory.dmp
        Filesize

        64KB

      • memory/900-48-0x00000000000F0000-0x0000000000100000-memory.dmp
        Filesize

        64KB

      • memory/900-46-0x00000000000F0000-0x0000000000100000-memory.dmp
        Filesize

        64KB

      • memory/900-45-0x00000000000F0000-0x0000000000100000-memory.dmp
        Filesize

        64KB

      • memory/900-47-0x00000000000F0000-0x0000000000100000-memory.dmp
        Filesize

        64KB

      • memory/2088-12-0x0000000000400000-0x000000000043F000-memory.dmp
        Filesize

        252KB

      • memory/2088-15-0x0000000000400000-0x000000000043F000-memory.dmp
        Filesize

        252KB

      • memory/2088-9-0x0000000000250000-0x0000000000350000-memory.dmp
        Filesize

        1024KB

      • memory/2140-1-0x0000000000290000-0x0000000000390000-memory.dmp
        Filesize

        1024KB

      • memory/2140-2-0x00000000001B0000-0x00000000001C3000-memory.dmp
        Filesize

        76KB

      • memory/2140-7-0x0000000000400000-0x000000000043F000-memory.dmp
        Filesize

        252KB

      • memory/2140-4-0x0000000000400000-0x000000000043F000-memory.dmp
        Filesize

        252KB