Analysis

  • max time kernel
    150s
  • max time network
    155s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20230915-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20230915-enlocale:en-usos:windows10-2004-x64system
  • submitted
    09/10/2023, 15:43

General

  • Target

    NEAS.98348e8b85c3fc64f80db5578f4d474732a69220c17155ea93104dab72bd71eeexe_JC.exe

  • Size

    285KB

  • MD5

    452f303bac83dc941d6433b176449867

  • SHA1

    5ad4b1842f9b04319f8f60a8e44058672ffc4c50

  • SHA256

    98348e8b85c3fc64f80db5578f4d474732a69220c17155ea93104dab72bd71ee

  • SHA512

    366075c134863cee78286a4fb59b7b01970454e22760a4dd5b436f83d6c4866639a4cb9bb3d6b85c405b8c8873d2870b88c758f23f6694c05c7667cb36473faa

  • SSDEEP

    3072:ecSKLbut7BWLMcD/FHNKZuKqtyONJvq4H6gGIvuFHrHtIxJXA4/a9:oKHOWwe/RNKkK0vNdq4HZG0Wr2u

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).

  • Modifies data under HKEY_USERS 6 IoCs
  • Suspicious use of WriteProcessMemory 23 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\NEAS.98348e8b85c3fc64f80db5578f4d474732a69220c17155ea93104dab72bd71eeexe_JC.exe
    "C:\Users\Admin\AppData\Local\Temp\NEAS.98348e8b85c3fc64f80db5578f4d474732a69220c17155ea93104dab72bd71eeexe_JC.exe"
    1⤵
    • Checks computer location settings
    • Suspicious use of WriteProcessMemory
    PID:1692
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\tpkpfm\
      2⤵
        PID:4752
      • C:\Windows\SysWOW64\cmd.exe
        "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\xaxqhjdt.exe" C:\Windows\SysWOW64\tpkpfm\
        2⤵
          PID:3348
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" create tpkpfm binPath= "C:\Windows\SysWOW64\tpkpfm\xaxqhjdt.exe /d\"C:\Users\Admin\AppData\Local\Temp\NEAS.98348e8b85c3fc64f80db5578f4d474732a69220c17155ea93104dab72bd71eeexe_JC.exe\"" type= own start= auto DisplayName= "wifi support"
          2⤵
          • Launches sc.exe
          PID:4380
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" description tpkpfm "wifi internet conection"
          2⤵
          • Launches sc.exe
          PID:3964
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" start tpkpfm
          2⤵
          • Launches sc.exe
          PID:1376
        • 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:1588
      • C:\Windows\SysWOW64\tpkpfm\xaxqhjdt.exe
        C:\Windows\SysWOW64\tpkpfm\xaxqhjdt.exe /d"C:\Users\Admin\AppData\Local\Temp\NEAS.98348e8b85c3fc64f80db5578f4d474732a69220c17155ea93104dab72bd71eeexe_JC.exe"
        1⤵
        • Executes dropped EXE
        • Suspicious use of SetThreadContext
        • Suspicious use of WriteProcessMemory
        PID:2720
        • 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:3188

      Network

      MITRE ATT&CK Enterprise v15

      Replay Monitor

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      Downloads

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

        Filesize

        10.0MB

        MD5

        9d2ba9f3869cce8b59cec47aae7c898a

        SHA1

        41f61a18a96073a9fed89426255f94c21365226f

        SHA256

        828cd18509b59455a2c7b781514b511a91d46ba54e772dbca1442387137274e3

        SHA512

        5dca41e2706cf85af2d75f2018ffa73bd7a577616e712d737601963d5895ad6af6015ce25d1448f6fb64395e47188f3ff1418d3f135084c2141efe68dc71f950

      • C:\Windows\SysWOW64\tpkpfm\xaxqhjdt.exe

        Filesize

        10.0MB

        MD5

        9d2ba9f3869cce8b59cec47aae7c898a

        SHA1

        41f61a18a96073a9fed89426255f94c21365226f

        SHA256

        828cd18509b59455a2c7b781514b511a91d46ba54e772dbca1442387137274e3

        SHA512

        5dca41e2706cf85af2d75f2018ffa73bd7a577616e712d737601963d5895ad6af6015ce25d1448f6fb64395e47188f3ff1418d3f135084c2141efe68dc71f950

      • memory/1692-1-0x0000000002440000-0x0000000002540000-memory.dmp

        Filesize

        1024KB

      • memory/1692-4-0x0000000000400000-0x0000000002284000-memory.dmp

        Filesize

        30.5MB

      • memory/1692-7-0x0000000000400000-0x0000000002284000-memory.dmp

        Filesize

        30.5MB

      • memory/1692-8-0x0000000003FE0000-0x0000000003FF3000-memory.dmp

        Filesize

        76KB

      • memory/1692-2-0x0000000003FE0000-0x0000000003FF3000-memory.dmp

        Filesize

        76KB

      • memory/2720-13-0x0000000000400000-0x0000000002284000-memory.dmp

        Filesize

        30.5MB

      • memory/2720-10-0x00000000025B0000-0x00000000026B0000-memory.dmp

        Filesize

        1024KB

      • memory/2720-14-0x0000000000400000-0x0000000002284000-memory.dmp

        Filesize

        30.5MB

      • memory/3188-31-0x0000000001750000-0x0000000001760000-memory.dmp

        Filesize

        64KB

      • memory/3188-38-0x0000000001750000-0x0000000001760000-memory.dmp

        Filesize

        64KB

      • memory/3188-18-0x0000000000180000-0x0000000000195000-memory.dmp

        Filesize

        84KB

      • memory/3188-20-0x0000000000180000-0x0000000000195000-memory.dmp

        Filesize

        84KB

      • memory/3188-21-0x0000000002000000-0x000000000220F000-memory.dmp

        Filesize

        2.1MB

      • memory/3188-24-0x0000000002000000-0x000000000220F000-memory.dmp

        Filesize

        2.1MB

      • memory/3188-25-0x0000000001740000-0x0000000001746000-memory.dmp

        Filesize

        24KB

      • memory/3188-28-0x0000000001750000-0x0000000001760000-memory.dmp

        Filesize

        64KB

      • memory/3188-32-0x0000000001750000-0x0000000001760000-memory.dmp

        Filesize

        64KB

      • memory/3188-34-0x0000000001750000-0x0000000001760000-memory.dmp

        Filesize

        64KB

      • memory/3188-11-0x0000000000180000-0x0000000000195000-memory.dmp

        Filesize

        84KB

      • memory/3188-35-0x0000000001750000-0x0000000001760000-memory.dmp

        Filesize

        64KB

      • memory/3188-33-0x0000000001750000-0x0000000001760000-memory.dmp

        Filesize

        64KB

      • memory/3188-37-0x0000000001750000-0x0000000001760000-memory.dmp

        Filesize

        64KB

      • memory/3188-36-0x0000000001750000-0x0000000001760000-memory.dmp

        Filesize

        64KB

      • memory/3188-17-0x0000000000180000-0x0000000000195000-memory.dmp

        Filesize

        84KB

      • memory/3188-39-0x0000000001750000-0x0000000001760000-memory.dmp

        Filesize

        64KB

      • memory/3188-40-0x0000000001750000-0x0000000001760000-memory.dmp

        Filesize

        64KB

      • memory/3188-42-0x0000000001750000-0x0000000001760000-memory.dmp

        Filesize

        64KB

      • memory/3188-43-0x0000000001750000-0x0000000001760000-memory.dmp

        Filesize

        64KB

      • memory/3188-41-0x0000000001750000-0x0000000001760000-memory.dmp

        Filesize

        64KB

      • memory/3188-44-0x0000000001750000-0x0000000001760000-memory.dmp

        Filesize

        64KB

      • memory/3188-45-0x0000000001750000-0x0000000001760000-memory.dmp

        Filesize

        64KB

      • memory/3188-46-0x0000000001750000-0x0000000001760000-memory.dmp

        Filesize

        64KB

      • memory/3188-47-0x0000000001750000-0x0000000001760000-memory.dmp

        Filesize

        64KB

      • memory/3188-48-0x00000000017E0000-0x00000000017E5000-memory.dmp

        Filesize

        20KB

      • memory/3188-51-0x00000000017E0000-0x00000000017E5000-memory.dmp

        Filesize

        20KB

      • memory/3188-52-0x0000000006F80000-0x000000000738B000-memory.dmp

        Filesize

        4.0MB

      • memory/3188-55-0x0000000006F80000-0x000000000738B000-memory.dmp

        Filesize

        4.0MB

      • memory/3188-56-0x00000000017F0000-0x00000000017F7000-memory.dmp

        Filesize

        28KB